Reena ¹, K. Basavana Goud ¹

Affiliations
1 Department of Agricultural Entomology, University of Agricultural Sciences, Dharwad 580005, Karnataka, IN

Abstract

Studies conducted to determine the optimum conditions for mass production of Cotesia plutellae Kurdj. (Hymenoptera: Braconidae) revealed that host: parasitoid ratio of 100 second instar larvae: one-day old female of the parasitoid and rearing the parasitized larvae at 30°C and 75 percent relative humidity were the conducive conditions. The extent of parasitisation was 90.6 percent and duration of development was 12 days.

Keywords

Cotesia plutellae Kurdj, Host Age, Host Density, Mass Production, Optimum Condition.

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K. Basavana Goud ¹, S. Lingappa ¹, K. A. Kulkarni ¹

Affiliations
1 Department of Agricultural Entomology, University of Agricultural Sciences, Dharwad 580005, Karnataka, IN

Abstract

Larvae of cotton bollworm, Helicoverpa armigera (Hiibner) resistant and susceptible to fenvalerate and endosulfan were tested for susceptibility to a nuclear polyhedrosis virus. The LC₅₀ values were less in resistant strains than in susceptible. The resistance ratio to HaNPV was highest in fenvalerate resistant strain (0.88) followed by endosulfan resistant (0.64) strain.

Keywords

HaNPV, Helicoverpa armigera, Insect Resistance.

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