Abstract: 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,TN₁,N₂₂,AsD₇ 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.N₂₂ and AsD₇ 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 N₂₂ and S. furcifera on AsD₇. 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.

Key words: Nilaparvata lugens, Sogatella furcifera, Rice, Resistance, Population increase, respiration, biocrusts, low temperature, simulated warming