水稻品种抗性对褐稻虱自然种群控制作用的评价

STUDIES ON THE EFFICIENCY OF RICE RESISTANT VARIETIES IN CONTROLLING NATURAL POPULATION OF Nilaparvata lungens Stal (HOMOPTERA:DELPHACIDAE)

在水稻品种抗性对褐稻虱种群的控制作用研究中,大多数材料是在实验种群的试验中获得的,本文应用控制指数分析方法把实验种群的试验结果与自然种群的重要作用因子组合起来,对水稻品种抗性对褐稻虱自然种群的作用进行综合评价,结果说明,品种抗性作用于若虫存活率,与天敌的作用起着相辅相成的作用;而品种抗性对成虫繁殖力的影响,与捕食性天敌引起的成虫非正常死亡的共同作用,对褐稻虱种群后代卵量起着重要的控制作用。分析结果进一步明确品种抗性在种群系统控制中的优点,并为作物品种抗虫性对害虫自然种群作用的评价提供参考。

In present paper ,the mathematical model of population trend (pang et al.1990)was applied as an analytics to evaluate the effects of several resistant varieties of rice on the natural population of BPH (rice brown planthopper,Nilaparvata bigens Stal).The resistant varieties affected on the survival rates of the nymph stages and the fecundity of the adults of BPH population.The developmental period of the nymph,the peroviposition period and the oviposition process of the adult feeding on the various resistant varieties,were variable.These characters integrating with survival rates daily affected by the natural enemies,strengthened the effects of the plant resistance.It Is helpful for evaluating the efficiency of plant resistance to natural population of pest insects.To use the mathematical model of population trend,expanding with the sum of multiplier of the survival rates in adult stage and the fecundity rates daily.