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Table 2.5-11.

Table 2.5-11. Estimated yield loss to powdery mildew diseases severity and varietal resistance.
Varietal Reaction Estimated Yield Loss Given Detectable Disease (1%) at Different Canopy Levels During Head Emergence
Third Leaf Second Leaf Flag Leaf
Modified from Lipp, P. E. and Madden, L. V.; Phytopathology 79:462-470.
Susceptible 6% 16% 25%
Moderately Susceptible 4% 10% 16%
Moderately Resistant 2% 5% 8%
Resistant — — —

A disease level of 1% is equal to approximately 2 or 3 pustules per leaf. Estimates of yield loss are based on 6 varieties over 3 years.