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桃小食心虫是为害苹果、梨和枣等果树的主要害虫。近年来该虫发生数量有所回升,部分果园为害十分严重。目前生产上采用的防治措施,仍以化学防治为主,使用农药品种比较单一,且多属高残留、广谱性的农药。树上防治使用的大宗农药为对硫磷。使用这类农药污染环境,破坏果园中的天敌和促使红蜘蛛猖獗为害都有较大的影响。为了克服上述存在问题,需要寻找高效、低毒、低残毒农药品种以代替对硫磷等农药。我们于1979—1980年以2.5％溴氰菊酯乳剂(法国产品),对桃小食心虫卵、初孵化幼虫进行药效测定,并开展了田间防治试验和生产防治示范。现将初步结果整理如下。
Peach Mung Beetle is the main pest that harms fruit trees such as apples, pears and dates. In recent years, the number of the insects has picked up some of the orchards are very serious damage. At present, the prevention and control measures adopted in the production are still dominated by chemical prevention and treatment. The varieties of pesticides used are relatively simple and most of them are pesticides with high residues and broad spectrum. The bulk pesticide used in tree control is parathion. The use of such pesticides to pollute the environment, destroy natural enemies in orchards and promote rampant spider mites have a greater impact. In order to overcome the above problems, we need to find efficient, low toxicity, low residues of pesticides to replace pesticides such as parathion. We measured the efficacy of 2.5% deltamethrin emulsions (French products) from 1979 to 1980 on the eggs and newly hatched larvae of Peach, and carried out field control trials and production prevention and treatment demonstrations. The preliminary results are now organized as follows.