Abstract

                                Male diamondback moth catch in sex pheromone trap was noticed throughout the year in the Nilgiris. Trap catches were higher from April to July in 1990-91 and February to April during 1991-92. Weather elements cumulatively contributed of 16.34 per cent of variation in trap catch. Minimum temperature, relative humidity and total rainfall had negative influence on the trap catch. Positive correlation existed between field pupal population and pheromone catch.

Key words : Diamondback Moth, Pheromone, Trap Catch, Weather Elements.