论文部分内容阅读
杉梢小卷叶蛾是低山丘陵地区杉树幼林的主要害虫。杉树嫩芽或顶芽被害后,造成枯梢或多头,严重地影响杉树正常生长,有的甚至难以成材。过去采用化学农药防治,由于药费高昂,未能大面积推广。1978年我们在鄂城县林科所的杉树试验林中,发现自然死亡的杉梢小卷叶蛾幼虫。1979年5月将这种死幼虫进行室内研究,经分离、鉴定,筛选出对杉梢小卷叶蛾毒力高的E_(19)菌株。 1.E_(19)菌株的形态和培养特征
Shady small leaf roller moth is a hilly region of the main pests of young cedar. Cedar buds or the top buds killed, resulting in shoots or long, seriously affect the normal growth of fir, and some even difficult to get involved. The past, the use of chemical pesticide control, due to high costs, failed to promote large-scale. In 1978 we Edible County Forestry Branch of fir experimental forest, found that the natural death of Cedar lesser larvae. In May 1979, the dead larvae were studied indoors. After isolating and identifying, E_ (19) strains with high virulence to Dictyotidula stepanes were screened out. 1.E_ (19) Strain morphology and culture characteristics