Etiology, Etiology, ecology, epidemiology, prediction, and integrated management of above-ground fungal diseases and postharvest diseases of tree fruit and nut crops and vines in San Joaquin and Sacramento Valleys. Understanding and management of fungicide resistance. Preharvest aflatoxin and ochratoxin contamination in tree nuts (mainly pistachios) and figs. Molecular epidemiology and diagnosis of diseases by conventional and molecular procedures