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Apple scab, caused by Venturia inaequalis, can lead to large losses of marketable fruit if left uncontrolled. The disease appears in orchards during spring as lesions on leaves. These primary lesions are caused by spores released at bud burst from overwintering sources; these spores can be sexually produced ascospores from the leaf litter or asexual conidia from mycelium in wood scab or within buds...
In the UK, two demethylation inhibitor (DMI) fungicides, myclobutanil and fenbuconazole, are recommended for controlling apple scab. Experiments were conducted to determine whether the sensitivity of V. inaequalis to myclobutanil was correlated with that to fenbuconazole. There was a marked reduction in the sensitivity of V. inaequalis to myclobutanil; averaged ED 50 values increased from...
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