The Effect of Fungicide Schedules and Inoculum Levels on Early Blight Severity and Yield of Potato

Abstract

Disease severity and lesion number were lowest when fungicide sprays were initiated before flowering of the potato plant. Lowest disease incidence and highest yield of U.S. no. 1 tubers occurred in plots with low inoculum density and in plots were fungicide sprays were initiated before flowering. Whereas fungicide spray schedules had a significant effect on yield in 1985, there was no effect on yield in 1986