1972年秋苜蓿红蜘蛛在我校果园严重发生,至10月份苹果采收季节,红蜘蛛卵大量聚集在苹果树的主干、侧枝、花芽、叶芽及苹果的萼洼处。由于红蜘蛛的大量发生,严重影响了果树的生长和果实的品质。为此,1973年春在我校果园试用本区大量供应的几种农药进行了防治试验,以期找出杀螨效果较好的农药,为本区果园防治红蜘蛛提供依据。 In the autumn of 1972, the red clover of alfalfa occurred seriously in our school orchard. By the harvest season in October, a large number of spider eggs gathered in the trunk, side branches, flower buds, leaf buds and apple calyx in the apple tree. Due to the large number of spider mites, the serious impact on the growth of fruit trees and fruit quality. To this end, the spring of 1973 in our school orchard to try a large number of supply of pesticides in the area for prevention and control experiments in order to find a better anti-mite pesticides for the region orchard to provide the basis for the prevention and treatment of red spider.