【摘要】 <正> 乐果和三硫磷对为害苹果树的山楂紅蜘蛛和苹果紅蜘蛛均具较高的杀虫效力,后者尚有杀卵效能。这两种药剂对苹小食心虫显示良好的杀卵效力,乐果稍高于三硫磷。对初孵化幼虫同样具有一定的杀虫效力,也是乐果稍高于三硫磷。从田间防治試驗中初步看出,乐果和三硫磷对防治山楂红蜘蛛的效果良好,但逊于內吸磷。乐果防治苹小食心虫的效果接近于对硫磷,对卷叶虫較差;三硫磷防治卷叶虫的效果接近于对硫磷,对苹小食心虫较差。更多还原

【Abstract】 Laboratory and field tests were carried out in 1960—1962 to compare the effectiveness of preparations of dimethoate, trithion, parathion and systox for the control of two species of spider mites (Tetranychus viennensis Zacher and Panonychus ulmi Koch.), one species of fruit moth (Grapholitha inopinata Heinrich) and one species of leaf roller (Pandemis heparana Schiff.) on apples. Against the spider mites species, both dimethoate and trithion gave good results. The later was also an effective ovicide. Tests with the two preparations also indicated that they were effective ovicides and larvacides against the fruit moth species. To both stages dimethoate was more effective than trithion. In field tests, dimethoate and trithion were about equal in effecitveness against Tetranychus viennensis, but inferior to systox. Against the fruit moth, dimethoate was almost as effective as parathion, and was less effective against the leaf roller. Against the leaf roller, trithion was almost as effective as parathion, and was less effective against the fruit moth.更多还原