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Position: Home > Articles > Biology of Pachynematus itoi Okutani and Its Influence on Larch Growth Journal of Northeast Forestry University 2006,34 (5) 13-15

伊藤厚丝叶蜂生物学及其对落叶松生长的影响

作者：

王志明;刘国荣;程彬

单位：

吉林农业大学;吉林省林业科学院

关键词：

伊藤厚丝叶蜂;落叶松林;生物学;危害评估

摘要：

对伊藤厚丝叶蜂生物学、发生规律等方面进行了较为细致的研究。结果表明,伊藤厚丝叶蜂在吉林省1年3代,以预蛹在落叶层下越冬。次年5月上旬化蛹,5月中旬羽化。第一代卵于6月上旬孵化,7月初可见成虫。第二代幼虫于7月末进入暴食期,第三代幼虫于8月下旬再次进入暴食期。9月中旬幼虫下树结茧于落叶层内开始越冬。该虫暴发危害期通常为2a,间隔周期为8~10a。人工模拟危害试验结果表明,落叶松一次性失叶,可影响3年材积生长,其中以第2年生长损失最大。受害当年,当失叶率为20%~30%时,落叶松表现出超补偿现象。如果针叶全部被食尽的话,第2年材积生长损失率最高可达65.6%。

译名：

Biology of Pachynematus itoi Okutani and Its Influence on Larch Growth

作者：

Wang Zhiming(College of Agronomy, Jilin Agricultural University, Changchun 130118, P. R. China); Liu Guorong, Cheng Bin(Jilin Provincial Academy of Forestry Sciences)

关键词：

Larch sawflies; Larch stands; Biology; Damage evaluation

摘要：

A meticulous observation on the biology and occurrence rule of Pachynematus itoi Okutani was conducted in Dunhua City, Jilin Province. Result showed that P. itoi has three generations a year. The prepupa overwinters in a cocoon on the ground, the pupa forms in early May, and the adult emerges in mid May. The eggs of the first generation hatch in early June and the new adults emerge in early July. The larvae of the second generation cause severe damage by feeding larch needles, and the third-generation larvae also injure the larch needles seriously in late August. In mid September the mature larvae come down from the tree to the ground and overwinter in the fallen leaves. The insect outbreak lasts 2 years, and the interval time is 8 to 10 years. The imitation test showed that a whole losing needles outbreak could reduce larch volume growth within three years, and in the second year the loss of volume growth would be the largest and it would reduce 65.5 percent volume growth. But in the first year when the needle loss rate is from 20% to 30%, the larch needle growth would present extra compensation.

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伊藤厚丝叶蜂生物学及其对落叶松生长的影响

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东北林业大学学报

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