Sex-attractant and attraction-inhibitors in Chinese larch casebearer, Coleophora sinensis Yang (Lep., Coleophiridae)
1993
Qing-He Zhang (Northern Forest Pest Bio-Control Experimental Centre, Shenyang (China)) | Priesner, E. | Han-Xan Wei | Qing-Cang Chen
The synthetic sex-attractant and the two attraction-inhibitors, previously established for larch casebearer species Coleophora laricella Hbn. and Coleophora dahurica Flkv., were field tested on Coleophora sinensis Yang in plantations of Larix principis-rupprechtiiMayr. in Shanxi province, northwest of China, in 1992. Pure(Z)-5-decen-1-ol(Z5-10:OH) proved highly attractive at all test sites. (Z)-5-Dodecen-1-ol(Z5-12:OH) and (Z)-5-decenyl acetate (Z5-10:Ac) did not show attractive or synergistic properties but rather reduced male responses to Z5-10:OH sources; a 100 % Z5-12:OH addition lowered captures by ca. 70 %, and a 10 % and 100 % Z5-10:Ac by, respectively, ca. 90 % and almost 100 %. This pattern of attraction specificity roughly conforms to previous results on C. laricella and C. dahurica. Trapping tests using 100 mig Z5-10:OH (standard lure) revealed a one-month C. sinensis flight period and an early-morning attractant response. The species status of larch casebearers occurring in the People's Republic of China is briefly reconsidered from the point of pheromone response specificity
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