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为探讨褐稻虱Nilaparvata lugens(Stal)种群生态控制的作用机理,应用状态空间方程和作用因子添加分析法,研究植物次生物质不同组合对褐稻虱种群的控制作用;本研究以薇甘菊Mikania micrantha乙醇提取物、飞机草Eupatorium odoratum乙醇提取物与现代苦楝Melia azedarach油的不同组合,作用于褐稻虱种群;根据不同虫期的调查数据,拟合出控制矩阵中各分块矩阵的元素值,并对褐稻虱种群的控制作用进行模拟。结果表明:单独施用薇甘菊乙醇提取物(1gDW/100mL)、飞机草乙醇提取物(1gDW/100mL)、现代苦楝油(200倍)各1次,能显著降低褐稻虱种群数量,然而种群趋势指数I(population trend index)仍在1.00以上,即下代褐稻虱种群仍呈增长趋势,联合添加其中2种或3种能持续控制褐稻虱下代种群的增长。同时,植物次生物质对褐稻虱种群的控制作用主要表现在对成虫产卵的忌避作用,尤其是在本田种群建立的初期,由于其显著的忌避作用,降低田间卵量,使其种群数量明显降低,可有效地控制其为害。
In order to explore the mechanism of ecological control of Nilaparvata lugens (Stal) population, the control effect of different combinations of plant secondary metabolites on the population of brown planthopper (BPH) population was studied by applying the state space equation and the additive effect analysis method. In this study, Mikania micrantha Ethanol extract, Eupatorium odoratum ethanol extract and modern Melia azedarach oil were applied to the brown planthopper population. Based on the survey data at different stages, the element values of each block matrix in the control matrix were fitted, The control effect of the brown planthopper population was simulated. The results showed that the ethanol extract of Mikania micrantha alone (1gDW / 100mL), ethanolic extract of planeflower (1gDW / 100mL) and modern neem oil (200 times) could significantly reduce the population of brown planthopper, while the population trend index I (population trend index) is still above 1.00, that is, the population of brown planthopper in the next generation still shows an increasing trend. Adding two or three of them together can control the growth of the next generation of brown planthopper. At the same time, the controlling effect of plant secondary biomass on the population of brown planthopper mainly manifested itself in the evasion of adult eggs, especially at the initial stage of Honda population establishment. Due to its significant repelling effect and reducing the amount of ova in the field, Significantly lower, it can effectively control the damage.