水稻品种抗性对褐飞虱和白背飞虱种群动态的影响

用ＴＮ１、Ｎ２２、ＡｓＤ７和Ｐｔｂ３３等４个抗虫性差异明显的水稻品种测定了褐飞虱和白背飞虱在它们上面的栖息率、落卵量、卵存活率、若虫存活和发育状况，以及后代种群数量表现。结果表明，Ｐｔｂ３３通过减少２种飞虱的栖息率、落卵量，降低卵和若虫存活率，延长若虫的发育时间，抑制后代的种群数量增长，表现出明显的抗性。Ｎ２２对白背飞虱、ＡｓＤ７对褐飞虱的后代种群建立与发展均表现明显的抑制作用。２种飞虱在ＴＮ１上

Effect of rice variety resistance on population dynamics of Nilaparvata lugens and Sogatella furcifera

The effect of rice varieties with different insect resistance on dynamics of Nilaparvata lugens and Sogatella furcifera population was examined,based on the investigation of their inhabiting ratio,egg amount, survival rate of egg and nymph,nymph development,and the amount of their offspring population.Four rice varieties,TN 1,N 22 ,AsD 7 and Ptb 33 were investigated.Ptb 33 had a significantly lower inhabiting ratio, egg amount,and survival ratio of eggs and nymphs of both parasitic populations,a prolonged development time from nymphs to adults,and an inhibited offspring population, indicating an evident resistance of this host variety.N 22 and AsD 7 inhibited the development of offspring S. furcifera and N. lugens , respectively.The parasitic populations of S. furcifera and N. lugens developed more rapidly on TN 1,compared with N.lugens population on N 22 and S. furcifera on AsD 7. The relationship between the quantitative dynamics of both population and rice variety replacement was discussed,and the possibility of using resistant rice varieties to control these two insect populations was also analyzed.