Effectiveness of Nursery Box-Treatment with Cartap Granules Against the Rice Water Weevil, Lissorhoptrus oryzophilus KUSCHEL (Coleoptera: Curculionidae)

Abstract

Experiments were conducted to analyse the effect of the application of Cartap granules to rice nursery boxes on the control of the rice water weevil. Reduced feeding, delayed ovarian development and suppressed oviposition were observed in the adult weevils fed rice leaves containing Cartap at sub-lethal concentrations. Larvae hatched on the treated plants died after feeding the roots containing the toxic agent at a higher concentration than that in the leaves.