Effect of pine foliage damage on the incidence of larval diapause in the pine caterpillar Dendrolimus punctatus(Lepidoptera: Lasiocampidae)

Li-Li Huang; Guo-Hong Wang; Zhong He; Feng Ge

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Effect of pine foliage damage on the incidence of larval diapause in the pine caterpillar Dendrolimus punctatus(Lepidoptera: Lasiocampidae)

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The pine caterpillar Dendrolimus punctatus (Walker) with a larval facultative diapause is one of the most destructive insect pests of the pine tree Pinus massoniana in China. The larvae feeding on pine trees with different damage levels were studied to determine the induction of diapause under both laboratory and field conditions. Developmental duration of larvae before the third instar was the longest when fed with 75%-90%damaged needles, followed by 25%-40% damaged needles and intact pine needles, whereas mortalities did not differ among different treatments under the conditions of 25℃ and critical photoperiod 13.5:10.5 L:D. At 25℃, no diapause was induced under 15:9 L:D, whereas 100% diapause occurred under 12:12 L:D regardless of the levels of needle damage.Incidences of larvae entering diapause when they were fed with intact, 25%-40% and 75%90% damaged pine needles were 51.7%, 70.8% and 81% under 13.5:10.5 L:D, respectively.Similar results were obtained in the field experiment. Incidence of diapause was significantly different among the pine needle damage levels of pine trees when the photoperiod was close to the critical day length, indicating that the effect of host plants on diapause induction was dependent on the range of photoperiod. The content of amino acid and sugar decreased and tannin increased in pine needles after feeding by the pine caterpillars, suggesting that changed levels of nutrients in damaged needles or a particular substance emitted by damaged pine trees was perhaps involved in the diapause induction of the pine caterpillar.

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《中国昆虫科学：英文版》 |2008年第5期|441-445|共5页
作者
Li-Li Huang; Guo-Hong Wang; Zhong He; Feng Ge;
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作者单位

State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, Fujian Normal University, Fuzhou, China;

State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, Fujian Normal University, Fuzhou, China;

Key Laboratory of Developmental Biology and Neurobiology, College of Life Sciences, Fujian Normal University, Fuzhou, China;

Key Laboratory of Developmental Biology and Neurobiology, College of Life Sciences, Fujian Normal University, Fuzhou, China;

State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, Fujian Normal University, Fuzhou, China;

State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, Fujian Normal University, Fuzhou, China;

State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, Fujian Normal University, Fuzhou, China;

State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, Fujian Normal University, Fuzhou, China;

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原文格式 PDF
正文语种 chi
中图分类昆虫学;
关键词
Dendrolimus punctatus; diapause induction; leaf damage; photoperiod; Pinus massoniana;

机译：马尾松毛虫;滞育诱导;叶片损伤;光周期;马尾松;

Effect of pine foliage damage on the incidence of larval diapause in the pine caterpillar Dendrolimus punctatus(Lepidoptera: Lasiocampidae)

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