Abstract: Different sections of courtship signals and their combinations in the rice brown planthopper Nilaparvata lugens (Stal) were played back. Synthesized signals with different pulse repetition frequencies and main vibration frequencies were presented to the rice brown planthoppers. The results showed that the acoustic sections consisted of regular and continuous multi-pulses were effective in planthopper mating recognition. The pulse repetition frequency was an important sensitive signal character in planthopper mating choice. The sensitive ranges of pulse repetition frequency were narrow, 70－90 Hz for the female and about 22 Hz for the male; but the sensitive ranges of their main vibration frequency were wide, 200－1 700 Hz for the female and 100－300 Hz for the male.

Key words: Nilaparvata lugens, courtship signals, synthesized signals, effective acoustic sections, sensitive acoustic characters