崇信短肛棒虫经济阈值研究

崇信短肛棒虫 Baculum chongxinense Chen et He主要危害辽东栎、千金榆。摘叶试验表明摘叶量为 70 %时 ,材积损失为 2 .62 4 m3 /hm2。被食率为 30 %时 ,材积损失为 2 .0 8m3 /hm2 ,虫口密度为3.8%。防治费 2 2 5元 /hm2 ,在叶片被食率为 30 %时防治 ,每防治 1 hm2可挽回损失 60 7元。虫口密度 3.8%可作为防治指标

Economic threshold of Baculum chongxinense

Baculum chongxinense Chen et He attacks mainly Quercus liaotungensis and carpinus cordata .When the rate of eaten leaves reached 70%,the loss of volume was 2.624m 3/hm 2.If 30% of leaves were eaten out,the loss of volume would be 2.08m 3/hm 2 and the population density was 3.8% The cost of control was 225 Yuan/hm 2.That could retrieve the loss of 607 yuan/hm 2 So we considered 3.8% as economic threshold.