我场六百余亩柑桔园,多年来红蜘蛛为害严重,尤其是春秋两季,部分结果树落叶,着果少,大部幼龄树因红蜘蛛为害,枝条纤细,树势衰弱。我们曾使用过多种杀虫剂,如乐果、杀虫脒、亚胺硫磷、氧化乐果等防治,但都产生了不同程度的抗药性。1979年9月至11月,我们用40％乐果1000倍加25％亚胺硫磷500倍混合液,连续使用三次,经观察红蜘蛛死亡率在87—92％之间。1980年3月25日,对四百亩成片柑桔园的红蜘蛛,用40％氧化果乐700倍 More than 600 acres of citrus orchards in my field have been severely damaged by spider mites over the years, especially in spring and autumn. Some of the trees are deciduous and have few fruits. Most of the young trees are damaged by red spiders and have thin branches and weak trees. We have used a variety of pesticides, such as dimethoate, chlordimeform, imidacloprid, omethoate and other prevention and treatment, but have produced varying degrees of resistance. From September to November 1979, we used 1000 times of 40% dimethoate and 25% of 50% of metothion mixture for three consecutive times. The mortality rate of spider mites was between 87% and 92%. March 25, 1980, four hundred acres of red citrus into a piece of citrus orchard, with 40% oxidized fruit music 700 times