摘要
经三年观察试验与研究分析,大袋蛾对泡桐叶的危害,幼虫食叶量248.28 cm^2/条,防治指标确定为失叶量占25％。以四年生泡桐为例,大袋蛾幼虫防治指标定为4条/10片叶;泡桐载叶量(y)与胸径(x)的关系为:y=10 987.528 1x^(1.264 7)。
Cryptothelea variegata Snellen harms leaves of Paulownia fortune: during the larval stage, the area nibbled is 248.28cm2/one larva. That the nibbled area of leaves makes up 25 per cent of the total leaves on each tree has been determined as the index of control. As for old tree, the index of control was 4 larvae/ten pieces leaves. The relation between total leaves on each tree (y. cm2) and diameter breast-high (x:cm) is: y=10987.5281x1.2647.
出处
《林业科学研究》
CSCD
北大核心
1991年第2期167-171,共5页
Forest Research
关键词
大袋蛾
食叶量
防治
指标
泡桐
Cryptbthelea variegata
Paulownia fortunei
nibbled area
index of control
