论文部分内容阅读
为筛选出有效防治亚洲型舞毒蛾的最佳植物源杀虫剂,采用5%鱼藤酮、1%虫菊.苦参碱、5%桉油精、0.6%氧苦.内酯4种植物源杀虫剂,比较它们对舞毒蛾3龄幼虫胃毒和触杀处理后的毒性与拒食作用。结果表明:这4种植物源杀虫剂对舞毒蛾3龄幼虫均具有胃毒和触杀两种作用,其急性毒性总体表现为触杀处理大于胃毒处理,而在各自相对最高的浓度条件下,以0.6%氧苦.内酯的胃毒急性毒性为最大、5%桉油精次之;由于胃毒组的LC50均小于触杀组,因而胃毒处理的毒力更高;此外,0.6%氧苦.内酯和5%桉油精的胃毒和触杀毒力均远远高于其他两种药剂,并以前者为最高。对测定前后的饲料量进行比较后发现,4种药剂对舞毒蛾3龄幼虫均具有很好的拒食作用,尤其以5%桉油精5 000倍液处理的拒食率高达99.31%。因此,0.6%氧苦.内酯和5%桉油精可作为防治亚洲型舞毒蛾的首选植物源杀虫剂推广应用。
In order to screen out the best botanical insecticides for the effective control of Gypsy moths in Asia, 5 kinds of rotenone, 1% wormwood, matrine, 5% eucalyptol, 0.6% And their toxicity and antifeedant effect on the stomach poisoning and the contact treatment of 3rd instar larvae of Gypsy moth were compared. The results showed that these four plant-based insecticides had both stomach poisoning and contact-killing effects on the third-instar larvae of Gypsy moth. The acute toxicity of the four botanical insecticides was more than that of stomach poisoning. However, at the highest relative concentration, The acute toxicity of lactone was the largest, 5% eucalyptus oil was the second, and the LC50 of the stomach poisoning group was lower than that of the contact group, so the virulence of stomach toxicity was higher. In addition, 0.6% Bitter lactone and 5% eucalyptol fine stomach poison and touch toxicity are far higher than the other two agents, and the former is the highest. The results showed that all the four agents had good antifeeding effects on the 3rd instar larvae of Gypsy moths, especially 5% eucalyptol at 5 000 times. The antifeedant rate was 99.31%. Therefore, 0.6% oxymatrine and 5% eucalyptol can be used as the first plant-based insecticide for controlling Asian gypsy moths.