The electrical penetration graph (EPG) of two populations of Nilaparvata lugens with different virulence（TN1 population, Mudgo population） on susceptible rice variety TN1 and resistant rice variety Mudgo (with resistance gene Bph1) were studied. The results showed that duration of I waveform significantly affected by population of N. lugens and rice variety, followed by A waveform, then S waveform. The sex of N. lugens did not affect the three types of waveform. Three virulent treatments (TN1 population on TN1, Mudgo population on TN1 and Mudgo) showed shorter S and A waveforms compared with nonvirulent treatment (TN1 population on Mudgo). And a significant difference in A waveform between virulent treatments and nonvirulent one was found. The I waveform under the three virulent treatments was significantly shorter than that under nonvirulent treatment. The accuracies to distinguish the virulence of TN1 population and Mudgo population were 82.6% and 100%, respectively with 75 min of I waveform in a 3h record period as a criterion(i.e., I waveform more than 75 min represented virulent, less than 75 min represented nonvirulent). It is suggested that the duration of I waveform is a possible alternative for monitoring the virulence of N. lugens individual.
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