Influence of Temperature and Relative Humidity on Disease Occurrence of Sweet Pepper Caused by Cercospora capsici in a Plastic House

Abstract

The optimum temperature and relative humidity (RH) for frogeye leaf spot development on sweet pepper were 20-25°C and above 95% RH, respectively. Latent periods after inoculation were closely related to temperature and RH conditions. For lesion appearance in a plastic house, about 22 hours of the optimum condition, or about 150 hours at 15°C and above 95% RH. The accumulated hours would be useful for predicting the onset of this disease in winter.