6种农药对瓜蚜的毒力测定及田间药效

为了筛选防治西瓜瓜蚜的有效药剂,用6种药剂进行了室内毒力测定和田间药效试验。结果表明,1.8%阿维菌素EC对瓜蚜的毒力最高,60g/L乙基多杀菌素SC毒力最低,48hLC50分别为0.38mg/L和2 225.63mg/L。6种药剂毒力大小依次为阿维菌素溴氰虫酰胺氟啶虫胺腈啶虫脒吡虫啉乙基多杀菌素。田间试验结果表明,1.8%阿维菌素EC 3 000倍、10%溴氰虫酰胺OD 2 000倍、22%氟啶虫胺腈SC 4 000倍对瓜蚜速效性及持效性均较好,3~14d防效均达到90%以上,防效差异不显著;20%啶虫脒WP 3 000倍和10%吡虫啉WP 3 000倍速效性及持效性均较差,1d防效分别为31.31%和6.66%,14d防效分别为57.39%和47.80%;60g/L乙基多杀菌素SC 1 000倍防效最差,药后14d的最高防效仅为34.70%。推荐田间轮换使用阿维菌素、溴氰虫酰胺、氟啶虫胺腈防治瓜蚜。

Toxicity and field control efficacy of six pesticides against the melon aphid Aphis gossypii Glover (Hemiptera: Aphididae)

In order to select effective insecticides for the melon aphid Aphis gossypii, toxicity bioassay and field tests of six pesticides on this aphid were conducted. The toxicity test results showed that abamectin 1.8% EC had the highest toxicity, with a LC50 value of 0.38 mg/L after 48 h. Spinetoram 60 g/L SC showed the lowest toxicity, with a LC50 value of 2 225.63 mg/L after 48 h. The order of the toxicity of the six pesticides from high to low was abamectin, cyantraniliprole, sulfoxaflor, acetamiprid, imidacloprid and spinetoram. The field efficacy experiments showed that 3 000 times dilution of abamectin 1.8% EC, 2 000 times dilution of cyantraniliprole 10% OD and 4 000 times dilution of sulfoxaflor 22% SC had best control efficacy and persistent effect to the melon aphids. The control efficacies of them were all above 90% after application for 3-14 d, and there were no significant differences among them. 3 000 times dilution of acetamiprid 20% WP and 3 000 times dilution of imidacloprid 10%WP had poor control efficacy and persistent effect, with control efficacies of 31.31%, 6.66% after 1 d, and 57.39%, 47.80% after 14 d, respectively. The control efficacy of the 1 000 times dilution of spinetoram 60 g/L SC was the worst, with a highest value of 34.70% after 14 d. We recommend the rotation of sulfoxaflor, cyantraniliprole and acetamiprid for control of the melon aphid in fields