花生花蓟马室内药剂筛选及田间药效试验

采用浸叶法在室内对花蓟马进行了药剂筛选试验，并对毒效较高的3种药剂开展了进一步毒力测定和田间药效试验。结果表明，有机磷类的三唑磷和乐斯本，拟除虫菊酯类的高效氯氰菊酯、溴氰菊酯和高效氯氟氰菊酯，以及氨基甲酸酯类的丁硫克百威等药剂对花蓟马的毒效很低，致死率均在37．6％以下。阿维菌素、啶虫脒和吡虫啉对花蓟马的致死作用明显，致死率分别为98．3％、98．7％和66．8％，它们的LC50分别为0．97mg·L^-1、15．4mg·L^-1和42．4mg·L^-1，以阿维菌素的毒力最高，是吡虫啉的43．71倍。田间药效试验结果与室内毒力测定结果相符合，以阿维菌素的防效最高，达93．3％以上，且持效期较长，施药后12d的防效仍在90％以上，是防治花生花蓟马的首选药剂。

Screening and Field Trial of Pesticides for Flower Thrips (Frankliniella intonsa) in Peanut

Screening, toxicological test and field trial of pesticides were conducted on flower thripsFrankliniella intonsa （Trybom）] infesting peanuts. The results showed that F. intonsa was notsensitive to triazophos, carbosulfan, beta-cypermethrin, lorsban, deltamethrin and lambda cyhalothrin, and their lethality rates to the thrips were all less than 37.6 %. Abamectin, acetamiprid and imidacloprid were highly toxic to F. intonsa, and their lethality rates were 98.3%, 98.7% and 66.8% respectively, while their corresponding LC50 values were 0.97, 15.4 and 42.4 rag·L^-1 respectively. Abamectin showed the highest control efficacy against F. intonsa in the peanut field with persistent effect, reducing the occurrence of the thrips by more than 90% at 12 days after application. Therefore, abamectin was a superior pesticide to control F. intonsa.