褐稻虱危害水稻经济阈值的研究

STUDY ON THE ECONOMIC THRESHOLD FOR CONTROLLINO DAMAGE DUE TO THE BROWN PLANTHOPPER,Nilaparvata lugeas(Stal)

摘要: 本文运用系统分析的原理和方法,研究了褐稻虱田间种群动态,水稻的受害情况和褐稻虱一种主要天敌——草间小黑蛛的捕食作用,并建立这三个亚系统的模拟模型,在此基础上,将三个亚模型耦联起来进行逐日模拟,测定出随褐稻虱种群数量、虫龄结构、水稻生育期、产量水平及草间小黑蛛密度的变化而变化的动态经济(?)值,为褐稻虱经济(?)值的研究探讨一种比较系统而有效的方法。

Abstract: By means of the systems approach,a simulation model was developed in this paper,which deecribas the effects of the population dynamics of the brown plant hopper (BPT) in paddy fields,the loam in rice yield caused by BPT,and the functional reaponse of the dwarf ipider ((?) (?)) to BPT on the (?) threchold of BPT.Data obtained from indoor or outdoor experiments were used to run the daily aimulations,and the results abowed that the economic threahold varied with the population levels of BPT and its age-structure,the growing stage of the rice plant,the rice yield,and the density of the dwarf spider.