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杨圆蚧是我国东北林区杨树的主要害虫，对它的防治已经由化学防治向生物防治转化，红点唇瓢虫作为杨圆蚧的主要捕食性天敌，对杨圆蚧有较好的控制作用。在前人研究的基础上〔１～３〕，经在黑龙江省大庆市观察，越冬后的成瓢和各龄幼瓢，在林间除掉跳小蜂情况下，应用Ｈｏｌｉｎｇ圆盘公式Ⅱ型计算日极限捕蚧量：成瓢为１８．４１头／日，Ⅰ，Ⅱ，Ⅲ，Ⅳ，Ⅴ龄分别为１．６７７６头／日、２．０８８０头／日、６．１７６７头／日、１９．３００８头／日、３１．３４８０头／日；当幼瓢在林间被跳小蜂寄生时，应用Ｈｏｌｉｎｇ圆盘公式Ⅲ型计算各龄幼瓢日极限捕蚧量：Ⅰ，Ⅱ，Ⅲ，Ⅳ，Ⅴ龄幼虫分别为２．３８头／日、２．６２头／日、９．３３头／日、７．００３头／日、５．５９头／日。Ⅰ，Ⅱ级木各助迁一头越冬后的成瓢，在林间幼瓢被跳小蜂寄生情况下，杨圆蚧的虫口密度分别下降一个危害等级，控制力为５３．５％
Yang Kuwana is a major pest of poplar in the forest region of northeastern China. Its control has been transformed from chemical control to biological control. As a predatory natural enemy, Control effect. On the basis of previous studies [1 ~ 3], observed in Daqing City, Heilongjiang Province, into a scoop and young ladle after overwintering in the forest to remove the case of jumping bees, using the Holing disc formula type Ⅱ The daily limit of pensions was calculated as 18.41 heads / day, with 1.6776 heads / day, 2.0880 heads / day and 6.1767 heads / day for Ⅰ, Ⅱ, Ⅲ, Ⅳ, 19.3008 heads / day, 31.3480 heads / day. When the young scoop was parasitized in the forest by jumping bees, the limit catching scale of young scoops at each age was calculated by the formula of Holing disc type Ⅲ: Ⅰ, Ⅱ, Ⅲ , Ⅳ, Ⅴ instar larvae were 2.38 heads / day, 2.62 heads / day, 9.33 heads / day, 7.003 heads / day, 5.59 heads / day. Ⅰ, Ⅱ grade wood after the demolition of a winter over into a scoop, young scoops in the forest were parasitic jumping bee cases, the population density of Populus deltoides decreased by a hazard level, the control was 53.5%