Archive for the ‘Pest diagnostics’ Category


News reporting

‘Nose Knows Scouting’ uses trained dogs to sniff out Potato Virus Y

A North Dakota potato breeder brings in a speaker from Wyoming who has trained a dog to detect potato virus diseases using their nose.

A woman takes a black Labrador dog to smell bags of potato tubers on a driveway, as researchers look on.
Andrea Parish of Dayton, Wyoming, sniffs bags of potato seed tubers for disease in the North Dakota State University potato breeding program, as NDSU potato breeder Asunta “Susie” Thompson and technician Kelly Peppel look on. Photo taken May 17, 2022, at Fargo, North Dakota.

By Mikkel Pates

May 23, 2022 05:30 AM


 We are part of The Trust Project.

FARGO, N.D. — Good news: the newest high-tech tool for diagnosing crop disease is also man’s best friend — a friendly dog….

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Lucidcentral Identification and Diagnostic Tools   Lucid May 2022 Newsletter   Introduction   Last year we released a major Lucid v4 update that allows authors to build new dichotomous keys or to import existing paper-based keys and transform them to online, interactive keys.    A recent example of such a conversion concerns a series of keys to insects and spiders that can be found in rice in West Africa.   The original book in which these keys were published – E A Heinrichs and Alberto T Barrion (2004) Rice-feeding insects and selected natural enemies in West Africa: Biology, ecology, identification, has been out of print for a number of years.    Fortunately a digital copy was published online by the University of Nebraska – Lincoln, providing the digital text and figures for the conversion of these keys to  Lucid, and are now hosted on Lucidcentral.    A similar key to rice pests found in S.E. Asia is to be published shortly. This will be one of the largest dichotomous keys we’ve come across: 852 couplets and 1740 leads, covering 862 taxa!   It’s also pleasing to see how many new and diverse keys have just been released. This includes commercial timber identification, sawflies, tropical ferns and lycophytes, Calanoid Copepods, trees of the Diamantina located in Serra do Espinhaço, Brazil, a place recognized by UNESCO as a Biosphere Reserve, and finally, a key used by police forensic units for the identification of third instar larvae of 12 species of Calliphoridae.   We hope you enjoy reading our latest newsletter.   Regards,   The Lucid Team   Spotlight on Lucid keys supporting plant taxonomy at Missouri Botanical Garden While most Lucid identification keys aim to provide public access to taxonomic and diagnostic expertise (via online and mobile apps), there are situations where Lucid keys can be used to support the taxonomic process itself. This spotlight article illustrates how Lucid is being used by Dr Tom Croat at the Missouri Botanical Garden, St Louis, USA to support the taxonomic work of his team, as well as providing an online identification aid.  Tom Croat with 100,000th collection Anthurium centimillissimum photo by Dan Levin  Tom Croat with the 100,000th collection Anthurium centimillissimum photo by Dan Levin. For many years, Tom’s taxonomic work has focussed on the philodendron or aroid family (Araceae). The genera of this family are often large and morphologically challenging, particularly the genus Anthurium, possibly the world’s largest genus with over 3,000 species. As Tom puts it – “Araceae is a family with still thousands of undescribed species: the only way one can deal with such large groups is to use Lucid. Without Lucid, I could not deal with it, since there are now 1650 species in Lucid keys for Anthurium. We also have Lucid Keys for Adelonema, Dieffenbachia, Dracontium, Philodendron and Stenospermation. Current work is on constructing a key for Spathiphyllum”.  Over the years, Tom has collected more than 109,000 herbarium collections, more than 10,000 living plants, and maintains the world’s largest and most comprehensive collection of living aroid plants in the Garden’s greenhouses. Lucid matrix keys are initially used as a means of “cataloguing” new species that are introduced to the collection. The major taxonomic features of the living plants, as well as of dried herbarium specimens, are described in detail. The characters (more than 100 in all) are recorded into the existing Lucid Matrix, and new feature/states are added as necessary, together with their respective scores.    With the recent availability of the new dichotomous (pathway) key construction option, that has recently been upgraded and incorporated in the Lucid Builder software, Tom thinks there may be new opportunities here. “Having a Lucid dichotomous key would allow us to prepare keys to separate species in many groups that remain poorly known. While the Lucid matrix key enables us to select species that have already been incorporated into the key, a dichotomous key allows one to decide where a given species needs to be placed that is not already in the key.  Moreover, published revisions are expected to have dichotomous keys that are an integral part of the revision, so a Lucid Key, workable as it might be, will not serve that purpose. Thus, it is important that the Lucid Program should provide a means whereby a dichotomous key can be constructed from the existing taxonomic data stored within it. There are a number of large genera in Araceae, where we have 250 or more species. A dichotomous key allows one to visualize where new elements should fit and then one can decide if it should be fully described and entered into the Lucid matrix key”.  Tom has been in touch with us regarding further ideas he has on how both Lucid matrix and dichotomous keys might be adapted to help in this taxonomic process, which we are looking into. For further information about Tom’s work go to a recent publication – Araceae, a Family with Great Potential February 2019 Annals of the Missouri Botanical Garden 104(1):3-9      Digital Keys to the Calanoid Copepods Latest keys SawFly GenUS Sawfly GenUS This latest release from the Identification Technology Program (ITP) within the Animal and Plant Health Inspection Service (APHIS) includes a wealth of information about sawflies, keys to sawfly genera of North America, as well as keys to Sirex species of the World. https://idtools.org/id/sawfly/BRAZILIAN COMMERCIAL TIMBERS – Interactive wood identification key Brazilian Commercial Timbers – Interactive wood identification key This is an interactive key created to identify timbers commonly traded in Brazil. The identification is based on general characters and macroscopic anatomical features of wood. https://keys.lucidcentral.org/search/madeiras-comerciais-do-brasil/ This key is available in English and Portuguese.Australian Tropical Ferns and Lycophytes Australian Tropical Ferns and Lycophytes Australian Tropical Ferns and Lycophytes is a fern and lycophyte identification and information system for species occurring in northern Australia. https://keys.lucidcentral.org/search/australian-tropical-ferns-and-lycophytes/ Also available as an Android or iOS app. — Keys to the Calanoid Copepods These keys are looking to facilitate the identification of calanoid copepods (adult specimens (males and/or females)) to the level of family in the first instance and to the level of genera for the group of copepods known as the ‘Bradfordians’ and the families Centropagidae, Calanidae and Megacalanidae. Developed by scientists in the National Institute of Water and Atmospheric Research, New Zealand and CSIRO, Australia. https://keys.lucidcentral.org/search/calanoid-copepods/Tubulifera Australiensis Tubulifera Australiensis In the insect Order Thysanoptera, the suborder Tubulifera includes only a single family of living thrips, the Phlaeothripidae, and this family includes at least 66% of the thrips species known from Australia. This illustrated Lucid identification system helps to distinguish the 150 genera of Phlaeothripidae recorded from Australia. https://keys.lucidcentral.org/search/tubulifera-australiensis/Diamantina trees Diamantina trees Interactive identification key to trees that occur in and around Diamantina. Diamantina is located in Serra do Espinhaço, Brazil, a place recognized by UNESCO as one of the Biosphere Reserves. https://keys.lucidcentral.org/search/diamantina-trees/ — A tool for identifying insects and spiders in West African Rice A tool for identifying insects and spiders in West African Rice Keys to insects found in rice in 17 West African countries provides online help to identify specimens in rice insect collections and collected from the field. These are the first comprehensive taxonomic keys to West African rice arthropods and provide illustrations for 275 species of insects and 69 species of spiders associated with rice agroecosystems https://keys.lucidcentral.org/keys/v4/west_african_rice_insects_and_spiders/nteractive identification key for third instar larvae of Calliphoridae (Insecta, Diptera) of Neotropical forensic importance Interactive identification key for third instar larvae of Calliphoridae (Insecta, Diptera) of Neotropical forensic importance This key was developed to allow the identification of third instar larvae of 12 species of Calliphoridae (Insecta, Diptera, Oestroidea) of forensic importance that can be found in Brazil and in the Neotropical region. It was developed with the aim of helping police experts, students, and various professionals with, who may have limited familiarity with taxonomy, to obtain a safe and reliable diagnosis. https://keys.lucidcentral.org/search/chave-larva-calliphoridae/ This key is available in English and Portuguese.   Software Updates Lucid v4 Lucid v4  A new update of Lucid v4 (4.0.25 20220503) has been released and is available to download via Lucidcentral.org. See the release notes for bug fixes and changes. https://apps.lucidcentral.org/lucid4/updates.html   Download (login required) via: https://www.lucidcentral.org/my-account/downloads/   Fact Sheet Fusion logoA new update of Fact Sheet Fusion will be released at the end of May.   Modify your subscription    |    View online   Lucidcentral.org
Copyright 2022. All rights reserved.

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Thursday, 14 April 2022 07:06:00

Grahame Jackson posted a new submission ‘USDA ITP: Sawfly GenUS is now complete’


USDA ITP: Sawfly GenUS is now complete


Sawfly GenUS

ITP collaborator: Washington State Department of Agriculture

Authors: Quinlyn Baine, Chris Looney, Spencer K. Monckton, David R. Smith, Nathan M. Schiff, Henri Goulet, and Amanda J. Redford

USDA Animal and Plant Health Inspection Service’s Identification Technology Program (ITP) is pleased to announce the final release of Sawfly GenUS. The first release (February 2020) included identification support for all but the most diverse families of sawflies; this release adds that family and a new searchable host plant list. The website includes fact sheets, images, and keys to support a wide variety of users. 

Please find the attached PDF announcement to see an overview of ITP’s newest identification tool for PPQ and its partners. Please also feel free to forward this email or the attachment to your colleagues.

Sawfly GenUS can be accessed at: ​https://idtools.org/id/sawfly/ 

Visit our website to learn more about ITP’s tools and mobile apps

Interested in assisting ITP with tool development by being a beta reviewer for an upcoming ITP tool? We are seeking to increase our pool of beta reviewers for a variety of pest groups. Beta reviewers can be experts or non-specialists. Please contact us at itp@usda.gov. If you did not receive this email directly from ITP, and you would like to be included in future ITP announcement emails, please send a request to itp@usda.gov

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MARCH 4, 2022

Detecting plant leaf disease using deep learning on a mobile device

by David Bradley, Inderscience

diseased leaf
Credit: Pixabay/CC0 Public Domain

The visual and tactile examination of plant leaves is a standard method for identifying disease in crops and horticultural products. However, such an approach can be highly subjective and is dependent on the skills of the examiners. Writing in the International Journal of Computational Vision and Robotics, a team from Egypt describes a new approach to plant leaf disease detection using deep learning on a mobile device. The team’s tests against a standard database of diseased leaf images showed their system to be capable of up to 98% diagnostic accuracy. The process is rapid and showcases the sophisticated computational power available in modern mobile phones for this kind of intensive task.

Shaheera A. Rashwan and Marwa K. Elteir of the Informatics Research Institute at the City of Scientific Research and Technological Applications in Alexandria, suggest that for busy farmers in remote regions with no immediate access to plant disease experts, a mobile application that can help them spot disease and so treat the crops in a timely manner could be vital to their ongoing agricultural viability.

The team’s approach exploits the recent evolution of computational systems and especially graphical processing units (GPUs) that allow machine learning operations to be carried out efficiently in ways that previous generations of devices simply could not match for speed. Such operations facilitate the running of tools such as convolutional neural networks, which mimic certain characteristics of brain function, and allow image recognition and related tasks to be carried out quickly. The team thus embedded image recognition of the characteristics of disease in leaves for the present research.

Despite the great speed and accuracy of disease diagnostics that the team has shown, there is still room for improvement. They highlight an issue with shadows on images and confusing backgrounds when a user takes a photo of a suspect leaf. They hope to be able to develop a pre-processing step that will reduce any problems and the inaccuracies that might arise if the acquired leaf image is not as perfect as it might be for image recognition. Fundamentally, automated light level adjustment in the image would preclude issues arising because of shadows, while a step that isolates the leaf from its background in the image and effectively removes said background would ease the whole process still further and hopefully nudge the accuracy upwards.

Explore further

Identifying crop diseases—there’s an app for that

More information: Shaheera A. Rashwan et al, Plant leaf disease detection using deep learning on mobile devices, International Journal of Computational Vision and Robotics (2022). DOI: 10.1504/IJCVR.2022.121151

Provided by Inderscience 

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Minimizing Further Insect Pest Invasions in Africa

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Esther Ngumbi

Jun 20, 2018

Photo: Tamzin Byrne/ICIPE

This was written by Esther Ngumbi, and appeared on Sci Dev Net

USAID recently offered prize money for the best digital tools that can be used to help combat the fall armyworm (FAW), an invasive pest that has spread across Africa. The winners will be announced in the coming months.
Identified in over 35 African countries since 2016, the FAW is expected to continue to spread, threatening food security and agricultural trade in African countries.

Map of areas affected by Fall Armyworm (as of January 2018)

Map of areas affected by Fall Armyworm (as of January 2018) Credit: FAO

But this is not the first invasive pest the African continent is dealing with. Just a few years ago, African smallholder farmers battled the invasive South American tomato moth, Tuta absoluta. According to recent research, five invasive insect pests including T. absoluta cost the African continent US$ 1.1 billion every year.
Around the world, invasive pests are causing US$ 540 billion in economic losses to agriculture each year despite the fact that many countries are doing their best to prevent insect invasions now and into the future.

Tackling invasive pests reactively

To deal with invasive insects, African countries assisted by other stakeholders, including aid agencies such as USAID, research institutions such as the International Center for Insect Physiology and Ecology, the Center for Agriculture and Bioscience International (CABI, the parent organization of SciDev.Net) and the United Nations Food and Agriculture Organization (UN FAO) have repeatedly taken a reactive rather than a proactive approach in tackling the invasive pests only after they have established a foothold and caused considerable damage.
Ghana, for example, established a National Taskforce to control and manage FAW after the worms had invaded local fields. This taskforce mandate includes sensitizing farmers and making them aware of the symptoms of armyworm attacks so they can report infestations to authorities and undertake research aimed at finding short and long term solutions to combat the spread of FAW.

“While many of these strategies are working, one cannot help but wonder what it would take for African governments to get ahead of this problem.”

Esther Ngumbi, University of Illinois

Malawi’s government prioritized the use of pesticides as an immediate and short-term strategy to fight the FAW after many of their smallholder farmers lost crops to this invasive insect. Further, the government intensified training and awareness campaigns about this pest and installed pheromone traps to help monitor the spread only after the pest had established a foothold.
The FAO, a leader in the efforts to deal with invasive pests in Africa, has spearheaded many efforts including bringing together experts from the Americas, Africa and other regions to share and update each other on FAW. The FAO has launched a mobile phone app to be used as an early warning system tool. But again, many of these efforts happened after the first detection of the FAW.
While many of these strategies are working, one cannot help but wonder what it would take for African governments to get ahead of this problem. How can aid agencies such as USAID, UN FAO and other development partners that are currently spending billions to fight the invasive FAW help Africa to take the necessary steps to ensure that it is better prepared to deal with invasive insects now and into the future?

Anticipate and prepare

Recent research predicts that threats from invasive insects will continue to increase with African countries expected to be the most vulnerable. African governments must anticipate and prepare for such invasions using already available resources.
Early this year, CABI launched invasive species Horizon Scanning Tool (beta), a tool that allows countries to identify potential invasive species. This online and open source tool supported by United States Department of Agriculture and the UK Department for International Development allows countries to generate a list of invasive species that are absent from their countries at the moment but present in “source areas,” which may be relevant because they are neighboring countries, linked by trade and transport routes, or share similar climates. Doing so could allow African countries to prepare action plans that can be quickly rolled out when potential invaders actually arrive.

Learn from other regions

Africa can learn from other regions that have comprehensive plans on dealing with invasive insects and countries that have gone through similar invasions. The United States and Australia are examples of countries that have comprehensive plans on preventing and dealing with insect invasions, while Brazil has gone through its own FAW invasion.

“African governments must learn to be proactive rather than reactive in dealing with invasive insects.”

Esther Ngumbi, University of Illinois

Through workshops and training programs that help bring experts together, African countries can learn how to prevent and deal with future insect invasions. Moreover, key actors should help organize more workshops and training programs to enable African experts to learn from their counterparts overseas. At the same time, the manuals, and all the information exchanged and learned during such workshops, could be stored in online repositories that can be accessed by all African countries.   

Strengthen African pest surveillance

A recent Feed the Future funded technical brief, which I helped to write, looked at the strength of existing African plant protection regulatory frameworks by examining eight indicators including the existence of a specified government agency mandated with the task of carrying out pest surveillance.
It reveals that many African countries have weak plant protection regulatory systems and that many governments do not carry out routine pest surveillance which involves the collection, recording, analysis, interpretation and timely dissemination of information about the presence, prevalence and distribution of pests.
The International Plant Protection Convention offers a comprehensive document that can help African countries to design pest surveillance programs. Also, the convention offers other guiding documents that can be used by African countries to strengthen their plant protection frameworks. African countries can use these available documents to strengthen national and regional pest surveillance abilities.

Set up emergency funds

Invasive insects know no borders. Thus, African countries must work together. At the same time, given the rapid spread of invasive insect outbreaks, the African continent must set up an emergency fund that can easily be tapped when insects invade. In dealing with the recent FAW invasion, it was evident that individual African countries and the continent did not have an emergency financing plan. This must change.

By anticipating potential invasive insects and learning from countries that have comprehensive national plant protection frameworks, Africa can be prepared for the next insect invasion. African governments must learn to be proactive rather than reactive in dealing with invasive insects.
Doing so will help safeguard Africa’s agriculture and protect the meaningful gains made in agricultural development. Time is ripe.
Esther Ngumbi is a distinguished postdoctoral researcher with the Department of Entomology at the US-based University of Illinois at Urbana Champaign, a World Policy Institute Senior Fellow, Aspen Institute New Voices Food Security Fellow and a Clinton Global University Initiative Agriculture Commitments Mentor and Ambassador. She can be contacted at enn0002@tigermail.auburn.edu 
This piece was produced by SciDev.Net’s Sub-Saharan Africa English desk. 


[1] USAID: Fall Armyworm Tech Prize (USAID, 2018). 
[2] Briefing note on FAO actions on fall armyworm in Africa (UN FAO, 31 January 2018) 
[3] Corin F. Pratt and others  Economic impacts of invasive alien species on African smallholder livelihoods (Global Food Security, vol 14, September 2017).
[4] Abigail Barker Plant health-state of research (Kew Royal Botanic gardens, 2017).
[5] US Embassy in Lilongwe United States assists Malawi to combat fall armyworm. (US Embassy, 13 February 2018).
[6] Joseph Opoku Gakpo Fall armyworm invasion spreads to Ghana (Cornell Alliance for Science, 19 May 2017). 
[7] Kimberly Keeton Malawi’s new reality: Fall armyworm is here to stay (IFPRI, 26 February 2018).
[8] Malawi’s farmers resort to home-made repellents to combat armyworms (Reuters, 2018). 
[9] Fall Armyworm (UN FAO, 2018). 
[10] FAO launches mobile application to support fight against Fall Armyworm in Africa (UN FAO, 14 March 2018).
[11] Dean R. Paini and others Global threat to agriculture from invasive species (Proceedings of the National Academy of Sciences of the United States of America, 5 July 2016).
[12] CABI launches invasive species Horizon Scanning Tool (CABI, 2018).
[13] United States Department of Agriculture Animal and Plant Health Inspection Service(USDA APHIS, 2018).
[14] Australia Government Department of Agriculture and Water Resources (Australia Government, 2018).
[15] Plant protection EBA data in action technical brief (USAID FEED THE FUTURE, 26 January 2018).
[16] Guidelines for surveillance (International Plant Protection Convention, 2016)FILED UNDER:AGRICULTURAL PRODUCTIVITYMARKETS AND TRADEPOLICY AND GOVERNANCERESILIENCE

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Plantwise National Data Centre established in Pakistan

The plant health information collected through Plantwise plant clinics is a valuable resource. The Department of Plant Protection has set up a new National Data Centre in Karachi to collate clinic data. Plant health partners, stakeholders and other knowledge delivery systems will be able to use this information to make evidence-based decisions that strengthen plant health systems.

Farmer in Pakistan
Farmer in Pakistan

Techniques for managing data have become essential and are now common in business and services. With this in mind, Plantwise has now established the first-ever National Data Centre in Karachi, for the assimilation of Plantwise data in Pakistan. This robust management system will collate data coming from more than 1,000 plant clinics throughout the country.

National Data Centre training

The Plantwise programme has provided data management training to plant clinic staff in order to ensure the long-term collection of data. These staff members include local implementing organisation such as agriculture extension departments in each of the Pakistan provinces. 

As well as consolidating all the data and information, the National Data Centre aims to offer central hosting and managed services for all Government institutions including the Plantwise programme’s partners.

Data-driven decision-making

The new data centre will enable reliable, efficient and secure access to plant clinics’ plant health data, meaning partner organisations will no longer be required to host their own applications. In addition, partners will receive quicker and more secure networking facilities that will allow them to better showcase their services to end customers.

The National Data Centre will demonstrate how data-driven decision-making is essential for increasing production and improving quality in agriculture.

National Data Centre, Karachi
Setting up the National Data Centre, Karachi

The aim of Planwise was to increase food security and improve rural livelihoods by reducing crop losses. This has been achieved by establishing sustainable networks of local plant clinics, run by trained plant doctors, where farmers receive practical plant health advice. Data collected from these clinics allow for better response and monitoring especially in case of new pest outbreaks, and plant health data is made available for decision making while it is still relevant.

Consolidating data – National Data Centre

It was evident that the data collected from the provincial plant clinics in Pakistan needed to be securely stored with proper access controls.  Many of the individual government organisations, such as agricultural extension departments, had set up their own servers, or rather data centres, with high human resource and operational costs.

Therefore, it was considered vital that CABI, in consultation with its LIOI’s, establish a National Data Centre to reduce the cost of data management and increase the value of the clinics’ data. The National Data Centre will also provide the opportunity for cross-validation and high data security.

Help inform plant health services

The plant clinic data coming into the National Data Centre can be used to inform plant health services in various ways. For instance, this data can help to identify new and emerging plant health problems and act as an early warning system to the regulatory bodies, such as the Department of Plant Protection, that are responsible for pest and disease surveillance and response.

Further reading


CABI’s new global programme, PlantwisePlus, will support low and lower-middle-income countries to predict, prepare themselves for and prevent plant health threats in a changing climate – reducing crop losses and empowering farmers to increase income, food security and food safety by producing more and higher quality food.

PlantwisePlus will therefore focus on (a) strengthening detection of and response to pest outbreaks; (b) providing public and private agricultural service providers with better digital advisory tools to support farmers in sustainable crop management; (c) enhancing the availability of nature-positive and low-risk plant protection products to reduce reliance on high-risk farm inputs; (d) increasing consumer demand for and supply to local markets of safer, higher quality and locally produced food.PakistanPlantwisedata managementAgriculture and International Development

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Crop leaf disease identification based on ensemble classification

Livestock and horticulture are well-known contributors to the global economy, particularly in countries where farming is the sole motivation for income. Yet, it is regretful that infection degeneration has affected this. Vegetables are a significant source of power for people and animals. Leaves and stems are the most common way for plants to interact with the surroundings. As a consequence, researchers and educators are responsible for investigating the problem and developing ways for recognizing disease-infected leaves.

Growers everywhere across the world will be able to take immediate action to avoid their produce from getting heavily affected, so sparing the globe and themselves from a potential global recession. Because manually diagnosing ailments might not have been the ideal solution, a mechanical methodology for recognizing leaf ailments could benefit the agricultural sector while also enhancing crop output. The goal of this research is to evaluate classification outcomes by combining composite classification with hybrid Law’s mask, LBP, and GLCM.

The proposed method illustrates that a group of classifiers can surpass individual classifiers. The attributes employed are also vital in attaining the best findings because ensemble classification has demonstrated to be much more reliable.

Read the complete research at www.researchgate.net.

Kaur, Navneet & V, Devendran & Verma, Sahil. (2021). Crop leaf disease identification based on ensemble classification. 

Publication date: Fri 10 Dec 2021

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A Budding Problem: Managing Corn Earworm in Commercial Hemp Production


The corn earworm (Helicoverpa zea) is an emerging pest of commercial hemp production throughout the U.S. Boring through stalks and feeding on reproductive structures, this pest presents several management challenges for hemp producers. While integrated pest management strategies for more traditional agricultural crops are established, much work is still needed to develop effective IPM for the corn earworm in hemp. Shown here is a corn earworm larva feeding on a hemp plant flower bud. (Photo originally published in Britt et al 2021, Journal of Integrated Pest Management)

By David Coyle, Ph.D.

David Coyle, Ph.D.

Cheech and Chong. The Big Lebowski. Seth Rogen. These Hollywood legends helped thrust Cannabis sativa into modern-day pop culture, making it simultaneously famous and infamous. And while the topic of C. sativa tends to elicit a range of emotions and opinions, there is no debating the fact this plant has many, many attributes and qualities.

Cannabis sativa is an annual herbaceous crop native to east Asia but is now grown worldwide and can be cultivated for a variety of purposes. Cannabis sativa is known colloquially as hemp or marijuana; these are different cultivars of the same species. The difference between hemp and marijuana is purely chemical: marijuana has a high THC (tetrahydrocannabinol, aka the intoxicating part) content, whereas the THC content in hemp, by definition, must be less than 0.3 percent. There are also some physical differences, as marijuana and hemp grown for cannabinoids have more of a bushy, horticultural crop look while hemp grown for grain or fiber appears more like a row crop, growing from a tall singular stalk.

Hemp became a legal crop with the passage of the 2018 Farm Bill (the Farm Bill is now called the Plant Protection Act, or PPA 7721). This action was significant, as it was the first time hemp was legally differentiated from marijuana. While the law placed restrictions on its production and use, the legalization of industrial hemp (as it is known) led to several pilot production programs being initiated.

Since industrial hemp had not been cultivated in the U.S. before, pest management in this new crop was an area in dire need of research. Several well-known pests present challenges to hemp cultivation, including the corn earworm (Helicoverpa zea). An article published in September in the Journal of Integrated Pest Management highlights what we do and don’t know about H. zea management in industrial hemp. I spoke with the lead author, Kadie Britt, Ph.D., postdoctoral scholar at the University of California, Riverside, about challenges and opportunities associated with this well-known corn (and now hemp) pest.

Coyle: Do you think hemp will take off? I mean, do we even have the infrastructure to support this industry?

The corn earworm (Helicoverpa zea) is an emerging pest of commercial hemp production throughout the U.S. Boring through stalks and feeding on reproductive structures, this pest presents several management challenges for hemp producers. While integrated pest management strategies for more traditional agricultural crops are established, much work is still needed to develop effective IPM for the corn earworm in hemp. Shown here is a corn earworm larva that has tunneled into a hemp plant stem. (Photo originally published in Britt et al 2021, Journal of Integrated Pest Management)

Britt: Yes and no. There is a market, but there’s already too much planted acreage, and the market is saturated. 2019 was a big year after legalization in 2018, and some growers still have that material in their barns as of summer 2021. Hemp is very useful, and there’s a very positive long-term future with this crop in terms of grain and fiber. The fiber can be used for many things, including plastics, clothes, rope, and a bunch of other things. The grain can be used as a food (think Whole Foods fancy spices section) and has very beneficial fatty acids. Unfortunately, we still see too much cannabinoid and not enough grain or fiber acreage.

Regarding management, is it fair to say there are more questions than answers at this point?

Yes! Every answer seems to lead to more questions. Can we sample for pests in hemp as we do in other row crops? Yes, sampling is similar, but with nuances. For instance, pheromone traps don’t seem to be effective, so we’ll have to develop something else. The takeaway is that it’s difficult to rely solely on chemical control, and the best thing we can do or recommend at this point is to watch for eggs and larvae and to initiate spray applications with a product legal for use in hemp. Weekly spraying can be effective but targets only corn earworm—a more IPM-friendly approach is needed, but first we need to know more about the system.

What are the biggest management challenges for industrial hemp?

There are so many! Pest management is a huge challenge, but growers need to be able to successfully produce the crop first. Right now, there’s a lack of infrastructure for the crop as a whole. Industrial hemp is a legitimate alternative to many products; anything from fabric to plastic can be made from hemp. Some companies are building processing facilities, machinery, and all the other infrastructure necessary for a new crop. Having properly labeled pesticides available is a challenge, as industrial hemp probably won’t garner the attention of huge chemical companies, but smaller, newer biopesticide companies may be more willing, as will those that focus on specialty crops.

Any final thoughts?

Yes, the industry is new and emerging, and we have to realize that federal legalization of high-THC cannabis will likely happen at one point. The work we do now will only help prepare us for that time. Cannabis is here to stay, and pest susceptibility greatly increases when the crop is grown in a monoculture type of production. Commercial acreages are different than backyard growing operations. Any information we get now will only help future C. sativa growers, regardless of the final product.

Read More

Pest Management Needs and Limitations for Corn Earworm (Lepidoptera: Noctuidae), an Emergent Key Pest of Hemp in the United States

Journal of Integrated Pest Management

David Coyle, Ph.D., is an assistant professor in the Department of Forestry and Environmental Conservation at Clemson University. Twitter/Instagram/TikTok: @drdavecoyle. Email: dcoyle@clemson.edu.


IPM in Hemp: Managing Pests in a “New” Crop

September 5, 2019

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July 24, 2020 Research NewsCannabis sativaCorn EarwormDave CoyleHelicoverpa zeahempintegrated pest managementJournal of Integrated Pest ManagementKadie Britt

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Saturday, 27 November 2021 17:37:00

Grahame Jackson posted a new submission ‘News from PestNet’


News from PestNet

Hi Everyone

We are excited to tell you that PestNet has joined forces with the Pacific Pests, Pathogens & Weeds app (compiled by PestNet). It seemed sensible to put these two Pestnet endeavours together. Some time ago, we mentioned that the website had been redesigned to reflect the changes; now we have completed the amalgamation with new mobile apps. 

You can see the changes if you visit the website here. And you can download the new mobile apps by searching for “PestNet” or “Pacific Pests, Pathogens & Weeds” from the Google and Apple stores.

Hope you like the changes!

All the best

PestNet Moderators

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Researchers develop new method to quickly diagnose bean viruses

Lim Chang-won Reporter(cwlim34@ajunews.com) | Posted : November 10, 2021, 08:30 | Updated : November 10, 2021, 08:30

[Courtesy of Gyeonggido Business & Science Accelerator]
SEOUL — Soybean virus diseases result in reduced yields and inferior quality. Polymerase chain reaction (PCR), a method used in molecular biology, has been widely used to diagnose bean viruses, but it takes up to two weeks to acquire results. South Korean researchers have developed an envelope protein screening method that can easily identify bean viruses.

The common mosaic virus is seed-borne and causes mosaic and lesions on foliage as well as blackened roots. The yellow mosaic virus is often associated with the presence of virus source plants, with symptoms consisting of leaf mosaic formed by contrasting yellow or green mosaic areas.

After dropping a sample collected by scratching the skin of a bean into the diagnostic kit, it will be possible to check the results in five minutes. It enabled the selection of mini antibody candidates without a protein purification process, the bio-center of Gyeonggido Business & Science Accelerator (GBSA) said, adding the commercialization of diagnostic devices based on GBSA’s technology would replace imports.

The center said its research team proposed a new platform for the production of plant virus diagnostic kits using the combined module of SpyTag (peptide) and SpyCatcher (protein) for the binding of antigens and coat proteins. Using SpyTag and SpyCatcher, bioconjugation can be achieved between two recombinant proteins that would otherwise be restrictive or impossible with the traditional direct genetic fusion between the two proteins.

“Through continuous research and development, it has become possible to diagnose the virus in the early stages and preemptively block it,” an unnamed GBSA official said in a statement. “We will contribute to stable agricultural production by reducing economic losses caused by crop virus damage.” The study was conducted jointly with researchers from Kyungpook National University, the Rural Development Administration and the Ajou University College of Medicine.

Lim Chang-won ReporterLim Chang-won Reporteremail : cwlim34@ajunews.com© Aju Business Daily & http://www.ajunews.com Copyright: All materials on this site may not be reproduced, distributed, transmitted, displayed, published or broadcast without the authorization from the Aju News Corporation.

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How to diagnose a pest problem using the diagnostic tool

The Plantwise Knowledge Bank brings together plant health information from across the world. It includes a diagnostic tool, factsheet library, pesticide lists and pest alerts. For those seeking to diagnose a pest problem, the Plantwise Knowledge Bank’s Pest Diagnostic Tool is particularly useful, providing information to help identify the symptoms observed on a crop.

Tuta Absoluta © CABI

Diagnosing a pest problem

To be able to provide effective solutions to a plant health problem, it’s first important to diagnose a pest problem accurately. The diagnostic tool allows you to diagnose a crop problem through the symptoms observed and the part of the plant affected.

From the Plantwise Knowledge Bank home page, navigate to the diagnose a pest problem tile and click ‘identify a pest’.

Plantwise Knowledge Bank
Navigate to ‘Identify a pest’

Identify the pest problem

Once clicking on ‘identify a pest’, you are able to search by country or region from the drop-down list. The crop name is then typed into the search box and a list of suggested crops will appear to choose from.

Plantwise Knowledge Bank
Search by country and crop

Narrow down cause

The first step in narrowing down the cause of a plant health problem is to determine which part of the plant is affected by the pest. In some cases, several parts of the plant can be damaged, but to help diagnose the problem, the main part of the affected plant needs to be determined. The options provided in the tool include leaves, stems, whole plant, seeds, fruit, growing point, inflorescence, roots and vegetative organs.

Plantwise Knowledge Bank
Main part of affected plant selection

If the type of problem is already known it will help to narrow down your search further, otherwise a user would select ‘unsure’. The types of problems in the tool include mites, insects, fungi, nematodes and weeds.

The steps in the diagnostic tool mirror the plant clinic prescription form found on the data collection app.

Plantwise Knowledge Bank
Type of problem selection

Pest and disease results

Results from the diagnostic search are given as a list of possible pests or diseases, each with an image, and a link to a technical factsheet further describing the problem. The technical factsheet provides information on crop symptoms, preventative methods and effective solutions to the problem.

For further information on the pest or disease problem; the search tool on the Plantwise knowledge bank has over 15,000 pieces of content available for free.https://blog.plantwise.org/2021/08/12/what-is-the-plantwise-knowledge-bank/embed/#?secret=wMPC0G48cQ

Further reading

Contact us via email to share links to factsheets or any queries: plantwise@cabi.org

Visit the The Plantwise Knowledge BankPlantwise Knowledge Bankcrop healthdiagnostic searchdiagnostic supportplant healthCrop healthDevelopment communication and extension

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