Parasitism potential of Campoletis chlorideae Uchida (Ichneumonidae: Hymenoptera) against Spodoptera litura (Fabricius) (Noctuidae: Lepidoptera)
Keywords:
Campoletis chlorideae, parasitism potential, biocontrol, parasitoids, Spodoptera litura, pest managementAbstract
Campoletis chlorideae Uchida (Ichneumonidae: Hymenoptera) is a solitary larval parasitoid of Spodoptera litura (Fabricius) (Noctuidae: Lepidoptera), a notorious and polyphagus pest in India. Nutritional requirement, host age, specificity and density dependent factor play a very crucial role in biocontrol program of parasitoids and further their release in the field for pest control strategies. Attempt has been made to initiate the mass multiplication of parasitoid for successful biocontrol programme. Therefore, present work was conducted to find out the optimum host stage and density for maximum progeny production of the parasitoid under laboratory conditions. The parasitoid caused highest mortality in the pest larvae of second instars, 4-day old larvae were attacked most with high percent parasitism, 39.00%. Optimum density for maximum progeny production of C. chlorideae was 20, which generate maximum parasitism (41.00%). Host specificity by exposing the parasitoids towards different host species and analyse parasitoid preference by S. litura > Plutella xylostella (Linnaeus) > Mythimna separata Walker > Achaea janata (Linnaeus). Nutritional requirement of parasitoid was tested with different foodstuffs and found 50% honey best suited for maximum longevity 8.2 and 11.4 days for males and females respectively. The longevity ratio also female biased, 1: 1.39 (Male: Female). From the results it concludes that C. chlorideae fed with 50% honey solution, exposed to 3-5-day old caterpillars of S. litura at density of 20 gave maximum progeny production and effectively utilized in the biocontrol programme.
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