Abstract: Affected by a higher titer of juvenile hormone at the end of 5th nymphal instar and early stage after emmergence in vivo, the sexual maturation period of brachypterous adults of the brown planthopper was 40-50 hours earlier than that of macropterous adults. The percentage of successful mating of brachypterous females was higher and the mating ability of males was relatively stronger before 5-day age.Macropterous female adults did not mate at 1st. And 2nd. Day after emmergence. The mating ability of macropterous adults could surpass that of brachypterous adults gradually, the mating course of the experimental population lasted (70.38±41.77)s, and thepercentage of successful mating was 51.63%. Both males and females could mate repearly, and the percentage of successful mating was relatively higher during 0-4 o'clock and 10-14 o'clock in a day.

Key words: Nilaparvata lugens, mating behavior, JH titer