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梨实蜂1a(年)发生1代,以老熟幼虫在土壤内结茧越冬,第2年杏树开花时成虫羽化,待梨树开花时为害。成虫在花萼上产卵,经6—7d(天)卵孵化,2龄幼虫蛀果为害,不防治的梨园幼果被害率达70%以上。造成严重减产。1991年我们梨园由于对梨实蜂防治方法不当,幼果被害率达6o%以上,1992年我们采用新的防治方法,取得了良好效果,现介绍如下。(1)认真观察梨实蜂产卵和卵孵化情况。为药剂防治提供最佳时期。在园内不同方位选5株树为
Pear larvae 1a (year) occurred 1 generation, with mature larvae in the soil cocoon overwintering, the second year when the apricot flowering adult emergence, Pear blossom to be harmful. Adults lay their eggs on the calyx. After 6-7 days of incubation, the eggs of the 2nd instar larvae were damaged. The damage rate of pear fruits without control was over 70%. Cause serious cuts. In 1991, due to the improper method of prevention and control of pears, we found that the damage rate of juvenile fruit was more than 6%. In 1992, we adopted the new prevention and cure method and achieved good results. The introduction is as follows. (1) carefully observe the pear wasp spawning and egg hatching situation. Provide the best period for the prevention and treatment of medicaments. Select 5 trees for different directions in the park