Dynamics of the emergence of Grapholitha molesta (Busck) larvae from fruit under laboratory conditions
Author of the article:GONG QingTao1WU HaiBin1ZHANG KunPeng1LI SuHong2ZHANG XuePing1SUN RuiHong1
Author's Workplace：1.Shandong Institute of Pomology，Taian271000，China； 2.Shandong Tiandi Horticulture Technology Co., Ltd.，Taian271000，China
Key Words：Grapholitha molesta, larvae, rearing, dynamic, larvae leaving from fruit
Abstract： In order to determine how best to rear Grapholitha molesta (Busck) larvae in captivity and understand the dynamics of mature larvae emerging from fruit, we inoculated the same wetweight of three common fruits (two apple varieties and one hawthorn variety) with the same number of G. molesta eggs and fitted a logistic equation to the number of mature larvae that emerged. The results show that the most larvae emerged from Starkrimson apple followed by Fuji apple then Da jinxing hawthorn. There was little difference in the emergence time of larvae from the two apple varieties but larvae emerged from the hawthorn fruit 45 days earlier than from either apple variety. The average emergence time was about 6 days. 27.7 larvae emerged from a kilogram of Starkrimson apple, significantly more than from the two other kinds of fruits. The dynamics of mature larvae emergence may be closely related to fruit species, but appear to have little relationship to the variety of the same fruit species. This may be the reason for the generational overlap and increased crop damage often caused by this pest in mixed orchards. These results not only provide guidelines for the captive rearing of G. molesta but also for controlling this pest in orchards.