Tests with Some Insecticides against the Rice Stem Borer, Chilo Suppressalis

Abstract

Trials were conducted to evaluate initial and residual toxicity of some insecti-cides against the larvae of the rice stem borer, Chilo supressalis. In three tests, at the dosage of 0.05 per cent concentration per hill, Sumithion, parathion, EPN, Lebaycid, Dimecron, Telodrin, and BHC dust when used under constantly irrigated conditions gave excellent or good initial kill of the young larvae, but endrin and Sevin were not satisfactory. Parathion, however, was rather poor in one test. For residual effect, Sumithion, Dimecron and Lebaycid were poor; Telodrin, endrin Imidan and parathion were not reliable. EPN, and BHC dust when used with irrigation water constantly replenished were the best residual treatments tested. 本試驗為探討數種段蟲劑對於二化螟（Chilo suppressalis）幼蟲之初效及殘效。在三個試驗中，以 0.05%濃度，每欉 6c.c. 用量使用之 Sumithion , parathion , EPN , Lebaycid , Dimecron , Telodrin 及經常在權溉情況下使用之 BHC 粉劑對於幼齡幼蟲有良好初效，但 endrin 及 Sevin 效力則不足。不過， parathion 在另外一次誠驗中效果並不甚良好。殘效方面， Sevin , Sumi-thion , Dimecron及 Ledaycid 效果不佳，Telodrin , enadrin , Imidan 及 parathion則不甚可靠， EPN 及在灌溉水經常補充之條件下施用之 BHC 粉劑均有優秀殘效。