Abstract
Aerial dissemination of urediniospores of groundnut rust was studied using a Hirst spore trap and glassrod samplers for a period of 3 years covering winter, summer and rainy season crops in each year. In the rainy season, the pattern of rust incidence in the field and air borne urediniospore concentrations varied greatly depending on the rainfall and weather conditions. In winter, urediniospore concentrations increased steadily as the crop reached maturity and, in summer, they appeared mainly towards the end of the crop period, with the onset of monsoon rains. Air borne urediniospores showed a clear diurnal periodicity pattern with peak occurrence around noon. Incidence in the air was maximum when temperatures were 29–31°C and relative humidity 75–85 %. Numbers decreased with increasing height above the ground level with a sharp reduction above 2 m.
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