From PestNet
LATE BLIGHT, POTATO – UK: STRAIN DARK GREEN 37
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A ProMED-mail post
<http://www.promedmail.org>
ProMED-mail is a program of the
International Society for Infectious Diseases
<http://www.isid.org>
Date: Thu 26 Oct 2017
Source: Farmers Weekly [edited]
<http://www.fwi.co.uk/arable/potato-blight-strain-causes-resistance-concern-with-agronomists.htm>
The emergence of a new strain of late potato blight with signs of
resistance to the popular fungicide fluazinam is causing concern among
agronomists who suggest switching to other products. Fluazinam has
been one of the most effective actives against the disease, but
frequent use may have increased the selection pressure on the
fungicide.
After 5 cases of the 37_A2 (Dark Green 37) strain were confirmed in
the UK last year [2016], largely in the English Midlands, it has
spread to Kent, Shropshire, North Yorkshire, Cheshire and most
recently Derbyshire. It has not been seen in East Anglia yet.
Darryl Shailes, Hutchinsons advisory group, said from only a handful
of cases in 2016, there have been close to 20 confirmed cases this
year [2017]. “We don’t know where it will go next, but we do know it
is at least as competitive as the dominant strains Blue 13 and Pink 6
[see comments below],” he said. Although little is known about this
strain of the potato industry’s most damaging disease, it has proved
to be highly aggressive.
[Byline: David Jones]
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