EFFECTS OF ABIOTIC AND BIOTIC FACTORS ON PEST POPULATIONOF Helicoverpa armigera (HUBNER) ON CHICKPEA

摘要

The larval population of H. armigera had two peaks, during 1st week in December with a maximum of 1.73 and 2.13 which reached to 8.93 and 7.93 larvae/meter row during 4th week of February and those sharply declined thereafter with maturity of the crop. Abiotic factors, viz., temperature, wind speed and evaporation had positive relationships with larvae of H. armigera, while relative humidity and rainfall showed negative relationships with them during both the years. Positive role of relative humiditywas recorded with larval parasitisation of H, armigera due to C. chlorideae and temperature, wind speed, evaporation and rainfall had negative responses with parasitisation during both the years. During both the years negative relationships were recorded between larva! populations and their parasitisation by C. chlorideae.