Population dynamics of a pyralid, Antigastra catalaunalis (Dup.) on sesamum in relation to abiotic factors.
The impact of climatic factors on the population dynamics of Antigastra catalaunalis on Sesamum was studied under the agroclimatic conditions of western Uttar Pradesh, India, during 1989-90. The pest was active from germination to harvesting of the crop. The larval population reached its peak, 80.33/m2 and 85.17/m2, in the 1st and 2nd weeks of October, resp. Average weekly temperatures of 28.85 to 29.75°C and 71.21 to 72.21% RH coupled with no rainfall were the most favourable environmental conditions for rapid population increase. There was a strong negative correlation between larval population and the minimum temperature and afternoon RH. This suggested that effective control of A. catalaunalis should start as soon as the rains stop and/or the crop approaches the reproductive phase.