Observations on the effects of mildew, Erysiphe graminis, on growth of spring and winter barley

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Abstract
SUMMARY: In field plots, early and severe attacks of powdery mildew on spring barley plants greatly reduced the vigour, decreased the amount of root, the number of ear‐bearing tillers and the grain size. In less severe, or later attacks, mildew mainly affected the grain size.On winter barley, where mildew attacked both in autumn and in spring, yield was decreased more than when only a spring attack occurred. The early attack retarded development of the root system, increased winter kill and decreased the number of ears reaching maturity.Because early mildew attack affects yield, it is not always possible to correlate yield loss with intensity of mildew at any one growth stage of the crop.