烟粉虱B生物型若虫皮蜕及成虫提取物对双斑蚜小蜂行为的影响英文.pdfVIP

昆 虫 学 报 Acta Entomologica Sinica , December 2003 , 46 (6) : 745 - 748 ISSN Effects of extraction from nymphs , exuviae and adults of Bemisia tabaci B biotype on the behavior of Encarsia bimaculata Heraty et Polaszek ( Hymenoptera : Aphelinidae) 1 ,2 1 1 1 Nasser S. MANDOUR , REN ShunXiang , QIU BaoLi , Sahar FAZAL ( 1Entomology Department , South China Agricultural University , Guangzhou , China 　510642 ; 2Plant Protection Department , College of Agriculture , Suez Canal University , Ismailia , Egypt ) Abstract : The response of female Encarsia bimaculata Heraty et Polaszek to its host , Bemisia tabaci ( Gennadius) nymph , ex uviae or adult extractions was bioassayed in a petri dish arena. The tested materials were extracted by hexane , ethanol and water. The data show that females spent much longer times searching in treated patches than controls. The parasitoids intensified their search in the treated patches and exhibited both orthokinetic and klinotaxic responses. The highest mean of the retention time in the treated patches was in those treated with material extracted from nymphs with water ( 11123 seconds) , otherwise parasitoids spent equal time in treated patches irrespective of the concentrations of the tested materials. Such kairomones might enhance fe male searching efficiency and guide them to hosts. Key words : Encarsia bimaculata ; Bemisia tabaci ; parasitoids ; kairomones ; arrestment response ; host location