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Factors affecting larval cannibalism in the cotton bollworm, Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae)

文献类型： 外文期刊

作者： Tang, Tao 1 ; Zhao, Chunqing 1 ; Xu, Li 1 ; Qiu, Lihong 1 ;

作者机构： 1.China Agr Univ, Coll Sci, Dept Appl Chem, Beijing 100094, Peoples R China

2.Nanjing Agr Univ, Coll Plant Protect, Dept Entomol, Nanjing, Jiangsu, Peoples R China

关键词： Helicoverpa armigera;temperature;cannibalism;larval development stage;food

期刊名称：ORIENTAL INSECTS （ 影响因子：0.527； 五年影响因子：0.573 ）

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收录情况： SCI

摘要： Cannibalism is a common phenomenon in insects including the cotton bollworm, Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae). The purpose of the present study was to investigate how factors (food availability, temperature and larval development stage) affect cannibalistic tendency in H. armigera under laboratory conditions. The results showed that cannibalism frequency of third instars reared on artificial diets was remarkably lower than that without artificial diets. The mortality was 90.00, 41.67, 38.33, 28.33 and 35.00%, as the amount of 0.00, 0.25, 0.50, 0.75 and 0.10g/larva of artificial diets at 56h of post-treatment, respectively. No significant difference in mortality was observed between treatment of 0.25, 0.50 and 1.00g/larva of artificial diets. Cannibalistic behaviour was obviously observed when third instars in groups were housed at four different temperatures including 22, 25, 28 and 31 degrees C. The mortality of third instars enhanced greatly as the rearing temperature increased and the highest was 51.67%, which was found at 31 degrees C, 56h after treatment. Cannibalism became more frequent as the larvae developed from third instars to fourth and fifth instars, with mortality of 41.67, 60.00 and 73.33%, respectively. These results indicated that different factors, especially food availability, were very important for the control of larval cannibalism in H. armigera.

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