Bionomics of the Pine Sawfly,Diprion Jingyuanensis

Abstract

Abstract: The behavior of D. jingyuanensis in each life stage including adult,egg,larva,prepupa and pupa was observed and described in detail and its natural enemy species were recorded.Studies showed that there were two climax which located the second ten-day of June and the second ten-day of July in the pine sawfly emergence in 1998.The reproduction rate difference between parthenogenesis and gamogenesis was not distict.Egg of developmental threshold was 14.92±2.3 ℃ and its effective accumulated temperature was 81.93±33.3 d·℃.Larva group took on aggregation distribution during low-density period.In outbreak of D. jingyuanensis,79 percent of cocoon was preyed by its natural enemies.The developmental time of female pupae was remarkably longer than male pupae.Maybe virus(NPV)infecting larva played an important role in controlling the sawfly population.

Key words: Diprion jingyuanensis；bionomics；natural enemy species, emergence dynamics

ZHANG Yun, YE Wan-Hui, LI Yue-Lin. Bionomics of the Pine Sawfly,Diprion Jingyuanensis[J]. journal6, 2003, 24(3): 55-61.

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