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为了搞清各种环境因子对杨圆蚧种群数量的影响,我们从1984年—1986年在黑龙江省绥化市,进行了杨圆蚧自然种群生命表的研究。 通过生命表的研究,了解了杨圆蚧[Quadraspidiotus gigas(Thiem et Gerneck)]种群数量变动及影响因子,得出了种群趋势指数(Ⅰ)值,它是预测次代害虫发生量的依据。经过二个世代的研究结果,由于各种因子的作用,特别是黄胸扑虱蚜小蜂[Prospaltella gigas Tshumakova]以下简称蚜小蜂)的寄生,1984—1985年(Ⅰ)值为0.16,1985—1986年(Ⅰ)值为0.49,种群数量连续下降。使种群数量保持在比较低的水平。 通过生命表的研究,不但了解了种群数量变动的趋势,而且还发现了杨圆蚧的天敌,尤其是蚜小蜂,对杨圆蚧的控制能力非常强,从2龄雌若虫到交尾后的雌成虫都可以被蚜小蜂寄生,寄生率很高,因此,对蚜小蜂应加以保护和利用。
In order to find out the effect of various environmental factors on the population of Populus deltoides, we studied the natural population life table of Populus deltoides from 1984 to 1986 in Suihua, Heilongjiang Province. Through the study of life table, we know the change of population and influence factor of Quadraspidiotus gigas (Thiem et Gerneck), and get the value of population trend index (Ⅰ), which is the basis of forecasting the generation of the second generation pest. After two generations of research, the parasitism due to various factors, especially the Prospaltella gigas Tshumakova (hereinafter referred to as Aphididae), 1984-1985 (I) was 0.16,1985 1986 (Ⅰ) value of 0.49, the population declined continuously. Keep the population at a relatively low level. Through the study of the life table, not only understand the trend of population changes, but also found the natural enemies of Yang Kuwana, especially aphids wasps, the control of Yang Kuwana very strong, from the 2nd instar nymphs to after mating Female adults can be aphid parasitoids parasitic parasitic rate is high, therefore, the aphid wasps should be protected and utilized.