MANAGEMENT OF COTTON PINK BOLL WORM PECTINOPHORA GOSSYPIELLA (SAUNDERS) WITH TRICHOGRAMMA BACTRAE AND T. BRASILIENSIS

摘要

A field trial was conducted at ICAR-CICR research farm, Nagpur, during kharif2016-2017 and 2017-2018 to evaluate the efficacy of egg parasitoid Trichogramma bactrae (Nagaraja) and T. brasiliensis (Ashmead) along with insecticides as check for management of cotton pink bollworm. In 2016-2017, results showed that the least number of exit holes were in T. brasiliensis treated plots followed by chemical treatment and T. bactrae. However, number of mines was the least in T. bactrae followed by chemical treatment and T. brasiliensis. The reduction in larval population over control was lowest in T. brasiliensis followed by T. bactrae and chemical control. During 2017-18 data revealed that the number of exit holes was the least in the plots sprayed with chemical insecticides and it was at par with T. bactrae. However, the least number of mines on epicarp was noticed in the plots imposed with T. bactrae followed by chemical insecticides. The significantly minimum per cent locule damage was noticed in the chemical treatment. Though the infestation of pink bollworm in the form of boll and locule damage was significantly low in insecticides treated plots it was comparable with T. bactrae and T. brasiliensis released plots.