Performance of Cotesia flavipes Cameron (Hymenoptera: Braconidae) Parasitizing Chilo partellus (Swinhoe) (Lepidoptera: Crambidae) as Affected by Size of Ovipositional Chambers


  • MPUAT, Department of Entomology, Rajasthan College of Agriculture, Udaipur, Rajasthan, 313 001, India


Investigations on larval parasitization of Chilo partellus (Swinhoe) by Cotesia flavipes Cameron in ovipositional chambers of different sizes were carried out under laboratory conditions at 27±2°C and 75±5 per cent relative humidity. Maximum parasitization (89.56 per cent) and maximum number of cocoons (37.53) was recorded in test tube when only one larva was provided in ovipositional chambers. The larval parasitization and cocoon formation were reduced with the increase in larval density from 2 to 5 larvae per chamber. The sex ratio recorded in test tube was statistically superior to pearl pet jar of 1000 and 2000 g but was on par with pearl pet jar of 500 g. The data showed that the provision of one larva to the one pair of adult of C. flavipes in test ovipositional chamber resulted in more female biased sex ratio, (80.0 per cent) in test tube followed by 78, 72 and 53 per cent sex ratio in pearl pet jar of 500, 1000 and 2000 g respectively.


Cotesia flavipes, Larval Endoparasitoid, Chilo partellus, Maize Stem Borer, Ovipositional Chambers

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