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Development of an Emergence Model for Overwintering Eggs of Metcalfa pruinosa (Hemiptera: Flatidae)
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 Title & Authors
Development of an Emergence Model for Overwintering Eggs of Metcalfa pruinosa (Hemiptera: Flatidae)
Lee, Wonhoon; Park, Chang-Gyu; Seo, Bo Yoon; Lee, Sang-Ku;
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The temperature-dependent development of Metcalfa pruinosa overwintering eggs was investigated at ten constant temperatures (12.5, 15, 17.5, 20, 22.5, 25, 27.5, 30, 32.5, and , Relative Humidity 20~30%). All individuals collected before April 13, 2012 failed to develop into first instar larvae. In contrast, some individuals that were collected on April 11, 2013 successfully developed when reared under temperature regimes. The developmental duration was shortest at (13.3 days) and longest at (49.6 days) in the fourth collected colony (April 26 2013). Developmental duration decreased with increasing temperature up to and development was retarded at high-temperature regimes (). The lower developmental threshold was and the thermal constant required to complete egg overwintering was 252DD. The Lactin 2 model provided the best statistical description of the relationship between temperature and the developmental rate of M. pruinosa overwintering eggs (). The distribution of the developmental completion of overwintering eggs was well described by the 2-parameter Weibull function () based on the standardized development duration. However, the estimated cumulative 50% spring emergence dates of overwintering eggs were best predicted by poikilotherm rate model combined with the 2-parameter Weibull model (average difference of 1.7days between observed and estimated dates).
Metcalfa pruinosa;Overwintering egg;Temperature-dependent development;Model;Forecasting;
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