“森林病虫害防治方法”是中等林业学校森林保护专业的一门专业课,是实践性较强的应用学科,按林业部颁布的大纲要求,其实验实习课时应占全部课时的三分之一。因此,作为授课教师,应把每一堂实验课充分利用起来,除讲清每一实验的原理外,还应在实验中及时发现问题,解决问题,对实验操作提出具体的设计。下面分别就本课化学防治方法中“石硫合剂的配制和性状鉴定”以及“烟雾剂的配制和使用”两个实验的改进分别作点介绍。一、关于“石硫合剂的配制和性状鉴定”这一实验,我们可以从原料的配比、原料的选择、 “Forest pest and disease control methods ” is a specialized course of forestry protection in secondary forestry schools, which is a practically applied discipline. According to the outline issued by the Ministry of Forestry, one third of the total class hours . Therefore, as a lecturer, every experiment class should be fully utilized. In addition to clarifying the principle of each experiment, problems should be found and solved in time in the experiment, and specific design of the experiment should be put forward. The following are the methods of chemical control in this lesson “preparation and characterization of lime sulfur mixture ” and “aerosol preparation and use ” two experimental improvements were introduced. First, on the preparation of “lime sulfur mixture and character identification ” This experiment, we can from the raw material ratio, the choice of raw materials,