net blotch

net blotch

[′net ′bläch]
(plant pathology)
A fungus disease of barley caused by Helminthosporium teres and marked by spotting of the foliage.
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A total of 86% of the 200 farmers surveyed by agri-business Sygenta pinpointed rhynchosporium, while 60% included net blotch, 53% mildew and 42% rust in their lists of problems.
Rhynchosporium also topped the list as the most difficult to control, with 34% of the votes, followed by 21% opting for net blotch.
She also works on DNA markers for other traits, such as protein quality and resistance to leaf rust and tan spot in wheat and resistance to net blotch and Septoria speckled leaf blotch in barley.
Net blotch was down on the average, whereas mildew was identified in 96pc of crops, yellow rusts in 32 pc and brown rust in 36pc.
Net blotch was found in 25pc of crops compared to the ten-year average of 41pc.
Bad weather late last year has led to an increased incidence of net blotch in early-drilled winter barley crops nationwide and patches of mildew have also been discovered.
Left untreated, net blotch can cause yield losses of 30-40%, plus it can cause reductions in grain quality.