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梨大食心虫在我国分布很广,有时为害非常严重。三年来在不同地区研究,初步明确了发生世代、田间发生消长及虫期历期,常因地而异。出蛰初期正是梨花芽萌动期,转果初期正是脱萼期,可根据物候期指示防治适期。室内药效测定结果:0.05%E 605、0.25%可湿性 DDT、0.14%敌百虫对幼虫有显著效果,0.0083%E 605、0.05%马拉松有极好的杀卵作用。田间防治试验结果证明,在幼虫集中出蛰的地区,于幼虫出蛰初期至盛期(花芽萌动至花芽开放),喷布一次50% E605 1000倍液,有很好的防治效果。幼虫害果期喷布50%可湿性 DDT 200倍液;初孵幼虫害芽期喷布50%可湿性DDT 200倍液混加波尔多200倍液,都有很好的效果。
Pear boreal worms are widely distributed in our country, sometimes very serious harm. Three years in different regions of the study, initially identified the occurrence of generation, the field occurred in the decline and the worm period, often due to different places. The beginning of the sting is Pear bud germination period, early fruiting period is off calyx, according to the indications of phenology prevention and control period. Indoor efficacy test results: 0.05% E 605,0.25% wettable DDT, 0.14% trichlorfon significant effect on larvae, 0.0083% E 605,0.05% marathon has excellent egg killing effect. Field control test results show that in the larvae concentrated out of sting areas, the larvae sting early to peak (flower buds germination until the flower buds open), spraying a 50% E605 1000 times, with good control effect. The larvae were sprayed with 50% wettable DDT 200 times during the period of fruit damage. The newly hatched larvae were sprayed with 50% wettable DDT 200 times and Bordeaux 200 times at the bud stage, all with good results.