Variations in Developmental Biology and Morphometries of Diamondback Moth, Plutella xylostella (Lepidoptera: Yponomeutidae) Collected From Different Geographic Areas of North India

摘要

A laboratory study was conducted to find out the variations in the developmental biology and morphometris of diamondback moth, Plutella xylostella (Lepidoptera : Yponomeutidae) collected from five different geographic regions viz., Hisar (800 feet), Kangra (2200 feet), Solan (4200 feet), Theog (7500 feet) and Kinnaur (9000 feet) at 25+1 "C on cauliflower. The observations on the morphometric study revealed that length and breadth of eggs was found to be maximum (0.52 and 0.34 mm) in case of Kangra population, whereas it was minimum (0.46 and 0.28 mm) in Hisar population. Wing expanse was maximum (13.25 and 14.95 mm) in Kinnaur population and minimum (12.05 and 13.15 mm) in Solan population. Significant differences were observed in developmental period for the population of different geographical regions. The total developmental period was maximum (17.03 days) for the Kangra population while it was minimum (14.65 days) for the Kinnaur population and was significantly different from each other. Thisstudy will play a significant role to device the regio specific management strategy against this pest.