论文部分内容阅读
我场第一次发现松梢害虫是在1951年。而后,逐渐蔓延,严重危害黑松、樟子松人工林的生长。据调查,目前在净月潭林区危害松树枝梢和球果的害虫主要有松梢螟、球果螟、松梢小卷叶蛾、球果小卷叶蛾等4种。为防止虫害的蔓延,1952年和1953年,我场曾两次进行人工剪梢灭虫,几年后,仍然大发生。而后,又试用多种化学药剂除治。但由于害虫(幼虫)都是在枝梢、球果内危害,树外施药,效果仍不显著。再加上树冠高、面积广,大规模使用喷雾、喷粉方法灭虫,困难是很多的。
My field first found pine needles in 1951. Then, it gradually spread and seriously jeopardized the growth of Pinus sylvestris var. Mongolica and Pinus sylvestris plantation. According to the survey, there are 4 kinds of pests that endanger pine shoots and cones in Jingyuetan Forest Area currently, such as pine needles, cone fruit borer, pine-leaf roller leaf-roller and cone-leaf roller leafworm. In order to prevent the spread of pests, in 1952 and 1953, we conducted manual shelling of insects twice in the field and still occurred a few years later. Then, try a variety of chemical agents in addition to governance. However, due to pests (larvae) are in the shoots, cones harm within the tree application, the effect is still not significant. Coupled with the high crown, a wide area, large-scale use of spray, dusting method of pest control, the difficulty is a lot.