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Overwintering Sites and Winter Mortality of Tetranychus urticae in an Apple Orchard in Korea
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 Title & Authors
Overwintering Sites and Winter Mortality of Tetranychus urticae in an Apple Orchard in Korea
Lee, Jung-Sup; Lee, Sun-Young; Do, Yun-Su; Lee, Seong Chan; Cho, Il Whan;
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The two-spotted spider mite Tetranychus urticae Koch, overwinters in apple culture areas of apple orchards. The mite overwinters in various places on the apple trees, usually in groups of 5-15 females. Overwintering females were mostly found in bark crevices with the hibernation cocoons of the oriental fruit moth, Grapholita molesta Busck. They were also found in small crevices of the bark, and in pedicels left after fruit harvesting. Furthermore, overwintering females were found on rough bark at the bases of buds and spurs, on small limbs and twigs, and in limb crevices and forks. Empty scales of dead diaspidids and coccids, as well as cocoons of lacewings and mummies of parasitized aphids sporadically found on trees, were found to be less common overwintering sites for females of the two-spotted spider mite. In two successive years, the mortality of overwintering females was very high, reaching approximately 72 and 80%. This could be due to the low temperature of winter season in Korea and the low cold tolerance of the mite.
Tetranychus urticae;Overwintering sites;Winter mortality;Diapause;
 Cited by
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