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苏联拉脱维亚里加森林公园4-15年新生松树遭受冬嫩梢、夏嫩梢、松顶芽、红松卷叶蛾的严重危害,采用化学防治无良好效果。后来采用生物防治法,利用拉脱维亚森林中的普通赤眼蜂进行防治。利用悬挂的硬纸盒(盒内装有杂谷害虫的卵卡),将赤眼蜂放进森林里。另将一些赤眼蜂放在实验室内繁殖,观察它对嫩梢卷叶蛾的效果。为了进行试验,预先采集这种不同类型的嫩梢卷叶蛾的幼虫和蛹,放在昆虫饲养室内培养至出蛾。当蛾产卵时,放进赤眼蜂。赤眼蜂对嫩梢卷叶蛾的卵的寄生力很强,寄生率达90%。在冬梢卷叶蛾的一个卵中,赤眼蜂能产6个卵。利用赤眼蜂防治嫩梢卷叶蛾的关键取决于放蜂的时间。第一次放蜂时间应是害虫开始产卵的时候;第二次放蜂时间是第一次之后相隔10天.
In the Riga, Latvia, Riga Forest Park 4-15 years old pine suffered winter tender shoots, summer shoots, pine top bud, pine roll leaf moth serious harm, the use of chemical control no good effect. Later, the use of biological control methods, the use of ordinary trichogramma in Latvian forests for prevention and treatment. Trichogramma was put in the forest using a hanging cardboard box (a box of zucchini eggs). Another Trichogramma species in the laboratory reproduction, observe its effect on the tender tip leaf roller. For testing, larvae and pupae of this different type of Noctuidae were pre-collected and cultured in moths to moths. When the moth spawns, add Trichogramma. Trichogramma parasitism on the tender tip of the leaf roller moth parasitism, parasitic rate of 90%. Trichogramma produces 6 eggs in one egg of the Winter Leaf Roller. The key to using Trichogramma to control young leafroll moths depends on the time of beekeeping. The first time for beekeeping should be the time for the pests to start laying eggs; the second for beekeeping is 10 days after the first.