针对太原市国槐尺蠖、蚜虫类、白蜡绵粉蚧、侧柏毒蛾主要虫害,进行蠹克和天敌组合的生物防治室内外试验.结果表明,蠹克对国槐尺蠖室内4h致死率达到31.3％,8h致死率达到68.8％,12h致死率达到100％;室外3d死亡率63％,6d死亡率为75.3％,有一定的防治效果.蠹克对松大蚜类室内4h平均死亡率为88.03％,8h平均死亡率为98.94％;室外3d平均死亡率为57.45％,6d平均死亡率为90.3％,防治效果良好.白蜡绵粉蚧若虫室内外试验分别达到12h死亡率70.0％,2d死亡率为74.2％.天敌组合实际卵块寄生率半个月达到80％,卵粒达到65.16％,实际寄生率很高.在实际防治中,提高蠹克分散性,能达到很好的防治效果;在适宜条件下增加放蜂量可提高寄生率.蠹克和天敌组合可作为一项生物防治手段在实际工作中应用,前景广阔.%According to studying on four major pest insects: Semiothisa cinerearia Bremer et Grey, Cinara pinea Mordwiko, Phenacoccus fraxinus Tang and Parocneria furva in Taiyuan, the article conducted indoor and outdoor tests on biological pest control by combing products of Pyemotes and natural enemy. The outcomes showed: the lethality rate of Pyemotes to Semiothisa cinerearia Bremer et Grey indoor at 4, 8 and 12 h were 31.3%, 68.8% and 100% respectively; this lethality rate in 3 days and 6 days outdoor were 63% and 75.3% respectively. So, this measure had certain effect. The lethality rate of Pyemotes to Cinara pinea Mordwiko indoor at 4 h and 8 h were 88.03% and 98.94% respectively; the lethality rate in 3 days and 6 days outdoor were 57.45% and 90.03% respectively. The measure had good effect. The lethality rate of Pyemotes to Phenacoccus fraxinus Tang indoor at 12 h was 70.0% and in 2 days outdoor 74.2%. Using this combining product of Pyemotes and nature enemy, the actual parasitic rate of spawn and egg granules were 80% and 65.16% 1/2 month respectively, and this rate was high. For achieving very good control effect, we can improve dispersion of Pyemotes in practical operation; increasing number of insects can improve efficiency of parasitic rate under suitable condition. The combining product of Pyemotes and nature enemy, as a biological pest control measure, can be used in practical works and has a bright future.
展开▼
