INFLUENCE OF SOME SELECTIVE PESTICIDES ON THE LONGEVITY AND PROGENY PRODUCTION OF Leptomastix dactylopii How., A PARASITOID OF CITRUS MEALYBUG, Planococcus citri (Risso)

M MANI, S N SUSHIL, A KRISHNAMOORTHY

Abstract


The influence of five selective pesticides vrz., dichlorvos 0.01 %, neem seed kernel extract 5%, copper oxychloride 0.20%, dicofol 0.05% and diflubenzuron 200 ppm on the longevity and progeny production of citrus mealybug parasitoid, Leptomastix dactylopii How. (Encyrtidae, Hymenoptera) was stuided at 25 ± 2 °C and 60-75% RH. The results indicated that the mean longevity of both male and female parasitoids was adversely affected with all the pesticidal treatments. Maximum reduction in the longevity was observed with the adults exposed to dicofol and minimum effect was pronounced with copper oxychloride. Progeny production was also adversely affected by all the pesticidal treatments. Diflubenzuron treated adults yielded lower number of progenies, and the reduction in progeny production was minimum with copper oxychloride. It is concluded that these selective chemicals have to be avoided, when L. dactylopii is released in the field, since they affect the longevity and progeny production of the parasitoids.


Keywords


Citrus mealybug;Leptomastix dactylopii;longevity;progeny production;selective pesticides

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