Studies on the seasonal and diurnal periodicity of Pyricularia oryzae cav. Codidia in the air over rice crop

Abstract

Air spore over rice crop was studied during three seasons using Hirst's spore trap, A definite pattern of seasonal and diurnal periodicity of occurrence was noted in the case of Pyricularia oryzae. The conidia load of Pyricularia oryzae was highest during November and December while it was comparatively lower during other months. Conidia of Pyricularia orysae showed a night maxima throughout the period of study, the highest load occurring arround 01.00 to 05.00 hours.