Effects of irradiation of each of the five peach fruit moth (Lepidoptera: Carposinidae) instars on 5th instar weight, larval mortality and cumulative developmental time: A preliminary investigation

文献类型： 外文期刊

第一作者： Li, Baishu

作者： Li, Baishu;Liu, Bo;Li, Tianxu;Wang, Yuejin;Zhan, Guoping;Gao, Meixu

作者机构：

关键词： peach fruit moth;Carposina sasakii;irradiation;radiation effect;weight;developmental time;mortality

期刊名称：FLORIDA ENTOMOLOGIST （ 影响因子：1.425； 五年影响因子：1.595 ）

ISSN： 0015-4040

年卷期： 2016 年 99 卷

页码：

收录情况： SCI

摘要： The peach fruit moth, Carposina sasakii Matsumura (Lepidoptera: Carposinidae), is a serious pest of many pome and stone fruits and presents a quarantine problem in some export markets. To investigate the effects of irradiation on larval weight, developmental time, and mortality, 3-, 6-, 9-, 12-, and 15 d-old larvae-which were 1st, 2nd, 3rd, 4th and 5th instars, respectively-were reared within 'Red Fuji' apple (Malus domestica Borkh.; Rosales: Rosaceae) fruits, and gamma-irradiated at doses from 20 to 140 Gy in increments of 20 Gy. Irradiation had significant effects on larval weight, cumulative larval developmental time, and mortality. More specific findings were as follows. Body Weight. The mean body weight of late 5th instars that developed from the 4 preceding instars decreased significantly in a dose-dependent manner when larvae in any one of these preceding instars had been irradiated with gamma rays. Mean body weight reduction of late fifth instars was greatest when 3rd instars were irradiated. In contrast, when 5th instars were irradiated their mean body weight increased significantly. Cumulative Larval Development Time. The mean cumulative larval developmental times increased significantly in a dose-dependent manner in comparison to the controls when any one of the 5 instars was irradiated. Larval Mortality. Significant larval mortality occurred in the first 4 instars when any one of them had been irradiated, but none of the irradiated 5th instars died in the apple fruits, indicating that the 5th instar is the most radiotolerant larval stage. Additional Research. Further research is suggested to elucidate the mechanisms whereby the weights of 5th instars that developed from irradiated 3rd instars are substantially diminished. Also research is suggested to elucidate the mechanisms whereby the weights of irradiated 5th instars increase substantially after they have been irradiated.

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