Studies on the Comparative Efficacy of Three Species of Trichogramma for the Control of Cotton Bollworms
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DOI:
https://doi.org/10.18311/jbc/1994/15112Keywords:
Cotton Bollworms, Trichogramma achaeae, T. brasiliensis, T. Chilonis, Comparative efficacyAbstract
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.Downloads
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