圆果大赤螨对萝卜蚜的捕食作用与5种杀螨剂的耐药性

室内测定了圆果大赤螨对萝卜蚜的捕食作用及对5种常用杀螨剂的敏感性.结果表明,大赤螨成螨对萝卜蚜若蚜的捕食量随温度升高而显着增加,20、25和30℃等3种温度下的日捕食量分别为5.30±0.57、7.97±0.26和10.53±0.74头;大赤螨对萝卜蚜成蚜的捕食量均较小,且3种温度处理之间无显著差异.由药后5 d总死亡率结果可见,5种药剂对大赤螨的毒性从低到高依次为:1%阿维·鱼藤新型EC 1500倍液<1%阿维·鱼藤新型EC 1000倍液和24%螺虫乙酯SC 3000倍液<73%克螨特EC 2000倍液和1%阿维·鱼藤新型EC 750倍液<1.8%阿维菌素EC4000倍液<18%阿维·甲氰EC 4000倍液.供试5种药剂中,18%阿维·甲氰EC4000对大赤螨的致死速度最快,24h死亡率高达98.77%±1.23%.

Predatory Function of Anystis baccarum L.to Lipaphis erysimi(Kaltenbach)and Its Sensitivity to Five Acaricides

The predatory function of Anystis baccarum to Lipaphis erysimi and its sensitivity to five ahcaricides were determined in the laboratory.It was shown that the predation quantity of Anystis baccarum to nymphs of Lipaphis erysimi increased along with the increase of temperature,the average predation quantity for three treatments of 20,25 and 30℃ were 5.30±0.57,7.97±0.26 and10.53±0.74 mites per day,respectively.But the predation quantity to adult was very low,and there were no significant difference among three treatments.Besides,the results of acaricde sensitivity tests indicated that the toxicity degrees of five acaricides to Anystis baccarum was as follows： 1500x emulsion of 1% mixture of abamectin and rotenone EC1000x emulsion of 1% mixture of abamectin and rotenone EC and 3000x concentration of 24% spirotetramat SC 2000x emulsion of 73% propargite EC and 750x emulsion of 1% mixture of abamectin and rotenone EC 4000x emulsion of 1.8% abamectin EC 4000x emulsion of 18% mixture of abamectin and fenpropathrin EC.And the lethal speed of 18% mixture of abamectin and fenpropathrin EC was the fastest in the five tested pesticides,which mortality of 24h after treatment was 98.77%±1.23%.