Studies on the Comparative Efficacy of Three Species of Trichogramma for the Control of Cotton Bollworms


The comparative efficacy of Trichogramma aehaeae Nagaraja and Nagarkatti, Trichogramma brasiliensis Ashmead and Trichogramma chilonis Ishii (8 releases @ 1,50,000 parasitised eggs/ha) was studied. Of the three species, T.achaeae was the most effective with 18.7% boll infestation, 51.8 bolls/plant and 14.3 q/ha seed cotton yield, followed by T.chilonis with 23.5% boll infestation,48.4 bolls/plant and 12.8 q/ha yield and T.brasiliensis with 27.7% boll infestation,43.2 bolls/plant and 11.4 q/ha seed cotton yield, Control had 32.3 % boll infestation, 30.6 bolls/plant and 7.6 q/ha seed cotton yield which were significantly lower than in different treatments.


Cotton Bollworms, Trichogramma achaeae, T. brasiliensis, T. Chilonis, Comparative efficacy


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