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1984年晚季在水稻田内系统调查白背飞虱,褐飞虱,黑尾叶蝉在稗草和水稻上的着卵量及其卵寄生情况。结果表明:(1)白背飞虱卵晚稻中期数量大,后期数量极少。田间稗草和田埂稗草上产卵量大,其卵量分别随时间的延长而减少,即呈直线负相关,R 分别是-0.826(P<0.05)和-0.779(P<0.05),而且消长趋势较一致(T=0.0003,P>0.1)。(2)褐飞虱卵量消长是中期数量少,后期数量突增,水稻上产卵量更多。但在水稻收割期,则更趋于稗草上产卵,尤其是在田埂稗草上产卵。(3)黑尾叶蝉卵量也是中期数量大,后期数量极少。田间稗草和水稻上产卵量较大,卵量和时间呈函数关系,直线相关系数分别是-0.779(P<0.05)和-0.958(P<0.01)。两直线斜率差异不显著(T=0.013,P>0.1)。(4)稻田稗草有较多的白背飞虱和黑尾叶蝉卵,而且卵平均寄生率很高,分别为48.6%和78.9%;卵出蜂数量也比田埂稗草和水稻高得多。
Systematic investigation in paddy field in late 1984 in 1984 The number of eggs and their egg parasitism on whitebacked planthopper, brown planthopper and black-tailed leafhopper on barnyard grass and rice. The results showed that: (1) The number of whitebacked planthopper eggs in the middle stage of late rice is large and the quantity is very little in the late stage. In the field, barnyard grass and barnyardgrass produced large amount of eggs, and the number of eggs decreased with the extension of time, which showed a linear negative correlation with R of -0.826 (P <0.05) and -0.779 (P <0.05), respectively Consumption trend more consistent (T = 0.0003, P> 0.1). (2) The number of brown planthopper eggs disappeared and the number of mid-term decline was small, the number of sudden increase in post-emergence, more eggs on rice. However, during the rice harvesting season, the eggs tend to spawn more on barnyardgrass, especially on barnyardgrass. (3) Blacktail leafhopper also has a large amount of mid-term eggs and very few late-stage eggs. The barnyard grass and rice in the field had a large amount of egg production and a function of egg amount and time. The linear correlation coefficients were -0.779 (P <0.05) and -0.958 (P <0.01), respectively. There was no significant difference in slope between the two lines (T = 0.013, P> 0.1). (4) The barnyard grass in paddy field had more whitebacked planthopper and black-tailed leafhopper eggs, and the average parasitic eggs were 48.6% and 78.9%, respectively. The number of eggs was also higher than that of barnyardgrass and rice many.