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The developmental time of the nymphs of Myzus persicae was studied in the laboratory (six constant temperatures from 15 to 30℃ with 50~60% RH, and a photoperiod of 14L:10D) and in a green-pepper plastic house. Mortality of M. persicae in laboratory was high in the first(6.7~13.3%) and second instar nymphs(6.7%) at low temperatures and high in the third (17.8%) and fourth instar nymphs(17.8%) at high temperatures. Mortality was 66.7% at 33℃ in laboratory and 26.7℃ in plastic house. The total developmental time was the longest at 14.6℃ (14.4 days) and shortest at 26.7℃ (6.0 days) in plastic house. The lower threshold temperature of the total nymphal stage was 3.0℃ in laboratory. The thermal constant required for nymphal stage was 111.1DD. The relationship between developmental rate and temperature was fitted nonlinear model by Logan-6 which has the lowest value on Akaike information criterion (AIC) and Bayesian information criterion (BIC). The distribution of completion of each developmental stage was well described by the 3-parameter Weibull function (r 2 =0.95~0.97). This model accurately described the predicted and observed occurrences. Thus the model is considered to be good for use in predicting the optimal spray time for Myzus persicae.

han-guk eung-yong gonchung hakoeji/han'gug eung'yong goncung haghoeji

Comparison of Development times of Myzus persicae (Hemiptera:Aphididae) between the Constant and Variable Temperatures and its Temperature-dependent Development Models