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Effect of damaged pine needles on growth and development of pine caterpillar larvae |
| ZHANG Lili1, LI Zhenyu1, LI Hailin2, HAN Ruidong3, ZHAO Yongli4 |
| 1.College of Resources and Environment, Beijing Forestry University, Beijing 100083, China; State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China; 2.College of Resources and Environment, Beijing Forestry University, Beijing 100083, China; 3.Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China; 4.Forestry Bureau of Chengde County, Hebei Province, Chengde 067400, China |
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Abstract Chinese pine caterpillar (Dendrolimus tabulaeformis) larvae were fed with pine needles of different degrees of damage to evaluate the effects of pine needles on the growth and development of larvae. The results showed that the nutritional index of the larvae declines after feeding on the damaged pine needlings. The lowest amount of food ingested and voided feces, the lowest nutritional index, slowest development, lightest pupae and most mortality were found in those pine caterpillar larvae fed with pine needles which were 50% damaged. The damaged pine needles significantly affected the population dynamics of Chinese pine caterpillars. The nutritional indices of larvae fed with 25% and 75% damaged pine needles were similar. The nutritional index of the dark morphs was higher than that of the tinted morphs, however, their mortality was lower than that of the tinted morphs. This phenomenon was reversed at the later stage of development when the larvae were fed on 50% damaged pine needles.
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Issue Date: 05 December 2006
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