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%.