Abstract
Longevity of female adults of the green rice leafhopper, N. cincticeps, was evaluated in field cages by the group-marking method. The longevity of the first generation of adults ranged from 9 to 11 days for the strain from Takada, Hokuriku district, and 5 to 8 days for the strain from Chikugo, Tôkai-Nisinippon district, except for the period from adult eclosion to marking (c.a. 2 days on the average). The longevity of the second generation adults ranged from 18 to 35 days for the Takada strain and 15 to 17 days for the Chikugo strain. There was no difference in longevity between the two strains. The longest longevity was 84 days, in the second generation. Adults of the first and the second generations coexisted during a period of 40 to 50 days.
