EFFECT OF METEOROLOGICAL FACTORS ON THE CONCENTRATION OF PLICCINIA HELIANTHI OVER SUNFLOWERN. JAGAN MOHAN REDDYAbstract The present investigations were carried out to find out the concentration of general airspora components of sunflower, special emphasis on rust pathogen and its relevance to the disease incidence and meteorological conditions. Air sampling was carried out over sunflower crop by operating "Tilak air sampler" with its orifice kept at a constant height of 1.5 meters above the ground level. The studies were conducted continuously from 5th March 1987 to 7" June 1987. the daily records of temperature, rainfall and humidity were maintained throughout the period of investigation. During present investigation only sporadic occurrence of Puccinia helianthi were observed in the air over sunflower. However, no sigh of disease was noticed in the field, it may be due to unfaborable weather conditions to the Puccinia helianthi to initiate the rust infection and spread the disease whereas it was serious during Kharif season.
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