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1978～1982年,作者对两索线虫(Amphimermis sp.)进行了研究,认为是调节当地褐稻虱种群数量的优势天敌。这类线虫分布区域较广,与害虫同一季节发生。感染线虫的褐稻虱寿命缩短,为害力减低,丧失繁衍后代的机能,在自然情况下的控制作用与寄生率(x)基本呈对应的线性关系,y=2.1845+0.9691x,r=0.9751(P<0.01)。因此,两索线虫是影响褐稻虱繁殖的重要因子。研究表明,早秋平均最低气温(x_1)和褐稻虱雌虫的线虫感染率(x_2)与褐稻虱繁殖系数(y)问的关系十分密切,复相关系数 R=0.9146,(P<0.001),y=24.9376+0.1820x_1-0.2823x_2±2.3892。根据此预测模式,可用以中期预测单季稻田穗期褐稻虱地方种群的发生量和发生程度,提高了准确率。
From 1978 to 1982, the author studied Amphimermis sp., Which was considered as the dominant natural enemy to regulate the population of brown planthopper. The distribution of such nematodes wider area, and pests occur in the same season. Nematode infestations of N. lugens reduced their lifespan, decreased their infestation and lost the function of multiplying offspring. In natural conditions, the control effect was linear with the parasitism rate (x), y = 2.1845 + 0.9691x, r = 0.9751 ( P <0.01). Therefore, two cable nematode is an important factor affecting brown planthopper reproduction. The results showed that there was a close relationship between average minimum temperature in early autumn (x_1) and nematode infection rate of brown planthopper (x_2) and reproductive coefficient (y) of brown planthopper, the correlation coefficient was 0.9146 (P <0.001) , y = 24.9376 + 0.1820x_1-0.2823x_2 ± 2.3892. According to this prediction model, the accuracy of the population can be used to predict the occurrence and occurrence of the brown planthopper population in the middle season in the single cropping season.