Studies on the population dynamics of sucking pests on MRC- 7918 (BG-II) Bt cotton

Abstract

The population dynamics of sucking pests on Bt cotton along with their correlation and regression between the weather parameters were studied during kharif 2016 at Farmer field Kommanalu village, Shivamogga with plot size of 300 m2 area. The peak incidence of thrips (thrips tabaci Lind) was noticed during first fortnight of September (43.70/ 3 leaves).While, the leafhopper (Amrasca biguttula biguttula Ishida.) population reached peak during September second fortnight (19.80/3 leaves). The aphid (aphis gossypii Glover) population reached peak during December second fortnight of (25.22/3 leaves). The whiteflies (Bemisia tabaci Gennadius) population reached peak during November first fortnight (0.75/3 leaves) sucking pest incidence showed positive and significant correlation with maximum temperature and negative significant correlation with rainfall.