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桃小食心虫是果树的主要害虫之一。防治“桃小”的关键是抓好其越冬出土幼虫的地面防治。过去防治越冬出土幼虫一直采用树下撒“六六六”粉的办法,“六六六”农药对“桃小”虽有较好的防治效果,但它在土壤、果实上留有残毒并污染环境。为此,利用我县地下水位较高,土壤较潮湿,有利于白僵菌生存的条件,我们从1979年起,采用白僵菌代替“六六六”农药,进行了生物防治“桃小”的试验。四年的试验表明,白僵菌对“桃小”有较好的防治效果。现将其试验情况小结如下:
Peach Mung Beetle is one of the major pests of fruit trees. Prevention and control of “peach small” key is to do a good job of its prevention and control of the overwintering unearthed larvae. In the past, the control of the overwintering larvae had been spreading the “BHC” powder under the tree. However, the “BHC” pesticide had a good control effect on the “peach fruit”, but it remained in the soil and fruits with residue and pollution surroundings. To this end, the use of higher groundwater level in my county, the soil is humid, conducive to the survival of Beauveria bassiana conditions, since 1979, we use Beauveria bidentis instead of “BHC” pesticides, biological control “peach small” Test. Four years of tests showed that Beauveria bassiana “peach small” have a better control effect. The test is summarized as follows: