Impact of integrated pest management technology on insect pest incidence, their natural enemies and economic viability of Bt seed cotton.

摘要

A field study was conducted at Balwada village of Khandwa district under Technology Mission of Cotton-Mini Mission-I during 2005-2006 and 2006-2007 to evaluate the performance of Bt cotton hybrid under IPM. farmer practice (FP) and unprotected condition (Check). The minimum population of aphids and leafhoppers were recorded under farmers practices (13.4 and 3.93/3 leaves) and it was significantly differ from IPM which was showed that its population of these insect reduced by the frequent application of insecticides effectively than IPM block and check. The similar trends have also been observed in thrips. The population of whiteflies were significantly minimum (12.8/3 leaves) in IPM block and it was at par with farmers block (13.9/3 leaves) and check. The significantly minimum Helicoverpa armigrea (Hubner) and Pectinophora gossypiella (Saunders) larval populations were found under farmers practice and at par with IPM. The significantly low per cent incidence of square and boll damage was noticed in IPM block i.e. 0.47 and 0.23 followed by farmers practices 0.65 and 0.47. The populations of lady bird beetle and green lace wing were significantly maximum under IPM (1.3/plant) and it was differ from unprotected plot (0.85/plant) and farmers practice (0.11/plant). The significantly highest seed cotton yield (25 q/ha) was found in IPM block followed by farmers practice (19.50 q/ha) and unprotected plot (12.25 q/ha). However the cost benefit ratio was high from IPM block (1:2.29) as compared to farmers practice (1:1.52) and unprotected plot (1:1.40).