The cotton aphid,Aphis gossypii Glover(Hemiptera:Aphididae),is an important insect pest of cotton crops worldwide.The objectives of this study were to determine the acute toxicity of afidopyropen and whether there are...The cotton aphid,Aphis gossypii Glover(Hemiptera:Aphididae),is an important insect pest of cotton crops worldwide.The objectives of this study were to determine the acute toxicity of afidopyropen and whether there are any effects of sublethal concentrations of afidopyropen on the biological characteristics of A.gossypii.The results showed that afidopyropen possesses high acute toxicity to adult A.gossypii with a 72 h LC_(50) value of 1.062 mg L^(–1).A sublethal concentration(LC_(10))of afidopyropen significantly decreased adult longevity,fecundity and oviposition days of female adults in both F0 and F1 generations.The total pre-adult survival of F_(1) progeny was also significantly reduced by 30%at the LC_(10) of afidopyropen.In addition,the nymph developmental time,pre-adult period,adult pre-reproductive period(APRP),and total pre-reproductive period(TPRP)of the F1 progeny were significantly prolonged compared with the control.Several population parameters,including the net reproductive rate(R_(0)),intrinsic rate of increase(r)and finite rate of increase(λ)of F_(1) progeny were significantly decreased by a sublethal afidopyropen concentration exposure.These results indicated that sublethal concentration of afidopyropen can significantly suppress A.gossypii population growth.It would be useful for assessing the overall effects of afidopyropen on A.gossypii.展开更多
[目的]评价新型杀虫剂5%双丙环虫酯可分散液剂对黄瓜蚜虫的田间防效。[方法]分别于2016、2017年进行田间药效试验。[结果]5%双丙环虫酯可分散液剂7.5~12.5 g a.i./hm^2对黄瓜蚜虫防效显著,药后3 d防效达94.33%~98.32%,药后7 d防效为92.0...[目的]评价新型杀虫剂5%双丙环虫酯可分散液剂对黄瓜蚜虫的田间防效。[方法]分别于2016、2017年进行田间药效试验。[结果]5%双丙环虫酯可分散液剂7.5~12.5 g a.i./hm^2对黄瓜蚜虫防效显著,药后3 d防效达94.33%~98.32%,药后7 d防效为92.07%~96.20%,持效期可达14 d左右。[结论]5%双丙环虫酯可分散液剂可作为防治黄瓜蚜虫的高效低毒药剂应用推广。展开更多
基金supported by the National Natural Science Foundation of China(31801760 and 31871997)the Fundamental Research Funds for the Central Universities,China(2662019QD052)。
文摘The cotton aphid,Aphis gossypii Glover(Hemiptera:Aphididae),is an important insect pest of cotton crops worldwide.The objectives of this study were to determine the acute toxicity of afidopyropen and whether there are any effects of sublethal concentrations of afidopyropen on the biological characteristics of A.gossypii.The results showed that afidopyropen possesses high acute toxicity to adult A.gossypii with a 72 h LC_(50) value of 1.062 mg L^(–1).A sublethal concentration(LC_(10))of afidopyropen significantly decreased adult longevity,fecundity and oviposition days of female adults in both F0 and F1 generations.The total pre-adult survival of F_(1) progeny was also significantly reduced by 30%at the LC_(10) of afidopyropen.In addition,the nymph developmental time,pre-adult period,adult pre-reproductive period(APRP),and total pre-reproductive period(TPRP)of the F1 progeny were significantly prolonged compared with the control.Several population parameters,including the net reproductive rate(R_(0)),intrinsic rate of increase(r)and finite rate of increase(λ)of F_(1) progeny were significantly decreased by a sublethal afidopyropen concentration exposure.These results indicated that sublethal concentration of afidopyropen can significantly suppress A.gossypii population growth.It would be useful for assessing the overall effects of afidopyropen on A.gossypii.