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http://dx.doi.org/10.5656/KSAE.2009.48.3.319

Population Dynamics of Eriosoma lanigerum (Hemiptera: Aphididae) and Aphelinus mali (Hymenoptera: Aphelinidae) in Apple Orchards and Screening Effective Insecticides in the Laboratory  

Kim, Dong-Soon (Faculty of Bioscience and Industry, College of Applied Life Science)
Yang, Chang-Yeol (The National Institute of Horticultural & Herbal Science, Horticultural & Herbal Crop Environment Division, RDA)
Jeon, Heung-Yong (The National Institute of Horticultural & Herbal Science, Horticultural & Herbal Crop Environment Division, RDA)
Choi, Kyoung-Hee (The National Institute of Horticultural & Herbal Science, Apple Research Station, RDA)
Publication Information
Korean journal of applied entomology / v.48, no.3, 2009 , pp. 319-325 More about this Journal
Abstract
Woolly apple aphid, Eriosoma lanigerum, overwintered as adult or nymph stage on rootstocks, and crown- and root sucker in the soil. In an un sprayed apple orchard, the number of E. lanigerum colony started to increase from mid-April, showed the 1st peak between late June and early July, thereafter decreased followed by the 2nd peak in late July, and then again peaked in late September as the size in the 1st peak. In this orchard, the number of E. lanigerum colonies per tree did not exceed 3.5 colonies during the peak occurrence period, and was maintained around 2 colonies throughout seasons. In all seasons, parasitism of Aphelinus mali on E. lanigerum was much lower on root colonies than on aerial colonies that located on shoots and tree trunks above the ground. The parasitism of E. lanigerum was high in most orchards examined, showing parasitism of > 70% in maximum in most cases. In the laboratory bioassay for the mortality effects of several insecticides on E. lanigerum, fenitrothion, dichlorphos, machine oil, methidathion, thiacloprid, and imidacloprid showed 97.8, 96.8, 95.4, 91.5, 26.7, and 7.8% morality, respectively. Also, the adult emergence rates from A. mali mummies were 51.2, 72.6, 14.2, 3.5, 72.2, and 85.4% in the treatment of the above insecticides, respectively. Insecticides belong to neonicotinoid, which are newly developed to control aphids, showed low mortality against E. lanigerum. Fenitrothion and dichlorphos were effective on E. lanigerum control and had a low toxic to A. mali. Consequently, the insecticides should be useful in integrated pest management system for E. lanigerum in apple orchards.
Keywords
Eriosoma lanigerum; Aphelinus mali; Population dynamics; IPM; Chemical control;
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