Delayed development of the whitefly （Bemisia tabaci） and increased parasitism by Encarsia bimaculata in response to sublethal doses of piperonyl butoxide  

作　　者：Ming-Hui Qian Qiong-Bo Hu Shun-Xiang Ren Nasser S.Mandour Bao-Li Qiu P.A.Stansly 

机构地区：[1]Department of Forest Protection,Guangdong Academy of Forestry [2]College of Natural Resources and Environment,South China Agricultural University,Guangzhou,China [3]Department of Plant Protection,Faculty of Agriculture,Suez Canal University,Ismailia,Egypt [4]University of Florida-IFAS,Immokalee,Florida,USA

出　　处：《Insect Science》2012年第3期403-411,共9页昆虫科学（英文版）

基　　金：Acknowledgments This research was supported by the China National Natural Science Foundation （30400292, 31071743）, National Basic Research Program of China （973 project 2006CB 102005, 948 project 2011 4 6 1） and Na- tional Department Public Benefit Research Foundation （201003065）.

摘　　要：Effects of sublethal piperonyl butoxide （PB） on parasitization of Bemisia tabaci （Gennadius） （Hemiptera： Aleyrodidae） by Encarsia bimaculata Heraty et Polaszek （Hymenoptera： Aphelinidae） were evaluated both in cage and greenhouse experiments. When first, second and third instar B. tabaci nymphs were treated with PB, all but the first instar were significantly prolonged. Data indicated that sublethal PB could improve E. bimaculata parasitism rates without influencing parasitoid eclosion rates. Prolonged development increased rates of parasitism by E. bimaculata, from 17.6% to 24.7% in cages, presumably by increasing the duration of host exposure. Sublethal PB combined with E. bimaculata as an integrated approach to control B. tabaci was evaluated using life table parameters under greenhouse conditions. Indices of population trend （I） calculated from life tables were estimated at 4.6 for B. tabaci exposed to PB and parasitoids compared to 14.1 with parasitoids alone and 23.5 in un- treated controls. The results showed that after PB was sprayed and parasitoids introduced, development ofB. tabaci was delayed and the peak of each stage was postponed. The older nymphal stage had highest mortality, primarily due to mortality caused by parasitism by E. bimaculata.Effects of sublethal piperonyl butoxide （PB） on parasitization of Bemisia tabaci （Gennadius） （Hemiptera： Aleyrodidae） by Encarsia bimaculata Heraty et Polaszek （Hymenoptera： Aphelinidae） were evaluated both in cage and greenhouse experiments. When first, second and third instar B. tabaci nymphs were treated with PB, all but the first instar were significantly prolonged. Data indicated that sublethal PB could improve E. bimaculata parasitism rates without influencing parasitoid eclosion rates. Prolonged development increased rates of parasitism by E. bimaculata, from 17.6% to 24.7% in cages, presumably by increasing the duration of host exposure. Sublethal PB combined with E. bimaculata as an integrated approach to control B. tabaci was evaluated using life table parameters under greenhouse conditions. Indices of population trend （I） calculated from life tables were estimated at 4.6 for B. tabaci exposed to PB and parasitoids compared to 14.1 with parasitoids alone and 23.5 in un- treated controls. The results showed that after PB was sprayed and parasitoids introduced, development ofB. tabaci was delayed and the peak of each stage was postponed. The older nymphal stage had highest mortality, primarily due to mortality caused by parasitism by E. bimaculata.

关 键 词：Bemisia tabaci Encarsia bimaculata PARASITIZATION sublethal piperonyl butoxide 

分 类 号：S435.132[农业科学—农业昆虫与害虫防治] TQ453.292[农业科学—植物保护]