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近年来,我省褐稻虱大发生的频率较高,对水稻生产的严重危害,日益受到有关方面的重视。关于褐稻虱危害损失及防治指标的研究,过去多是以虫口密度与产量损失的关系为依据,而在虫龄结构、种群变动和寄主反应等对产量损失的影响方面尚少报道。1986年,我们采取田间分期接虫和分期定点标记的方法,建立了褐稻虱虫量,水稻齐穗后天数与产量损失的曲面模型。1987年又进一步研究,现将结果报告如下。
In recent years, the occurrence of brown planthopper in our province is relatively high, which seriously damages the rice production and is receiving more and more attention from relevant parties. In the past, the relationship between pest population density and yield loss was mostly based on the studies on the harm loss and control index of brown planthopper, but few reports on the impact of insect age structure, population fluctuation and host reaction on yield loss. In 1986, we adopted the method of field staging and staging point labeling to establish the surface model of the number of brown planthopper, the number of days after heading and the yield loss of rice. In 1987 and further study, the results are reported as follows.