居住在衰弱树木和原木材上的树干害虫——小蠹虫,天牛,吉丁虫等,使林业遭受很大的损失。很久以来那是用剥皮方法防治这些害虫。但是剥皮需要很多劳力,并且剥皮后木材会裂开,因之降低其工艺价值。所以就不止一次试验用化学方法代替剥皮防止害虫。此外必须研究出一种药剂消减害虫。特别值得注意的方法是往树木和原木外面喷洒滴 Tree bark pests living in feeble trees and virgin timber - beetles, celastrones, and jylinties - have caused considerable damage to forestry. It has long been a skinning method to control these pests. However, peeling requires a lot of labor, and the peeled wood will crack, thereby reducing its process value. So more than one experiment with chemical methods instead of peeling to prevent pests. In addition, a pesticide must be developed to reduce pests. A particularly noteworthy method is to spray drops onto trees and logs