| RHYNCHOSPORIUM LEVELS DECREASE AGAIN IN WINTER BARLEY | ||||||||||||||||||||||||||||||
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Latest results from the Defra funded CropMonitor project indicate the benefit that
cultivar resistance can contribute to reducing disease pressures in winter barley.
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CropMonitor has found that the severity of rhynchosporium leaf blotch in commercially managed
winter barley was the lowest recorded since 1995, with levels in 2005 less than half those
recorded in 2004. This continues the gradual decline in severity evident since 2000. Net blotch
levels were the same as in 2004, which is higher than in any year since 2000 but still well below
the 10-year average. Strobilurin fungicides, which are used widely by industry, can achieve good control of this disease.
A contributory factor to current disease patterns may be the increased use
of the cultivar Pearl, which accounted for 50% of fields surveyed. HGCA Recommended List ratings
show that this cultivar has good resistance to rhynchosporium but is more susceptible to net blotch.
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Levels of powdery mildew declined compared to 2004 and do not suggest that resistance to
strobilurin fungicides is impacting on the industry's ability to control this disease. However,
the dominance of Pearl, which has good resistance to powdery mildew will have helped to reduce
disease pressures.
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Levels of eyespot were the highest since 2000 but were below the 10-year average.
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| Table 1: National foliar and stem base diasese levels (GS 71-73) | ||||||||||||||||||||||||||||||
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| Foliar diseases - percentage area of leaf 2 affected Stem base diseases - percentage stems with moderate or severe lesions * - provisional |
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RAPID ACCESS TO THE LATEST REGIONAL CROP PEST AND DISEASE LEVELS |
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