【摘要】 从肉桂双瓣卷蛾的卵上,找到螟黄赤眼蜂,经人工大量繁殖,1989～1991年在西江林业局属下富石场等11个林场4125亩肉桂林,共释放螟黄赤眼蜂19305亩次,每亩1万头,效果良好。3年来,肉桂春、夏、秋梢期卵粒寄生率有所提高,放蜂区为45.7％～76.1％,对照区为4.4％～26.1％;枯梢率显著下降,放蜂区为2.5％～33.1％,对照区为7.3％～42.6％。每亩增收80多元。更多还原

【Abstract】 Trichogramma chilonis was obtained from eggs of Cophoprora sp., a newly rising detrimental pest of Chinese cinnamon tree, Cinnamamumu cassia. During 1989-1991, T. chllonis was mass propagated and released at a rate of 150,000 per ha. in the 275 ha. of cinnamon farms of the West River District Forest Bureau of Zhaoqing City, Guangdong Province, to control Cophoprora sp. As a result of the continuous releases, 45.7-76.1% of the egg parasitization rate of the pest was obtained, compared with that of 4.4-26.1% in the non-released control farm. Percent damaged cinnamon tree tips was reduced from 7.3-42.6% in the control to 2.5-33.1% in the released farms. An increase of economic profit was achieved.更多还原