Abstract
Six cultivars, namely, LD 327, LH 1556, Ganga Kaveri-151, Ankur 651, Dbaval-2 and LHH 144 were e,'aluated for testing efficacy of Trichogramma chilonis Ishii. T. chilonis was released 13 times during July to September at weekly interval @ 1,50,000 per ha. Four sprays of compatible insecticides were given during this period. The lowest bollworm incidence among intact fruiting bodies was recorded in LD327 (1.40%) which was on par with Ankur 651 (2.06%) and LHH144 (2.10%) but significantly lower than other cultivars. There was no significant difference in mean bollworm incidence among green bolls, parasitization, and seed cotton yield in various cultivars.
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