Population dynamics of the overwintering generation of Sylepta derogata
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Key Words：Sylepta derogata, population life table, larva diapause, number of overwintering insect
Abstract：By rearing the fifth and sixth generation of Sylepta derogata Fabricius with two cotton cultivars Simian-3 and Sumian-12 in laboratory, it was found that the effective overwintering insect into next year came mainly from the fifth generation of S. derogata, with the diapause rate 24.4％～33.1％. The occurrence of sixth generation of S. derogata had little effect on the population size in the next year. The survival rate of diapaused larvae was 60.0％～71.9％. In the next year, the number of females coming from verwintering larvae was less than that of males, and the everage number of eggs per female was 163.4～198.8.