A Comparative Study of the Different Bionomic and Demographic Parameters of Four Green Leafhoppers, Nephotettix spp. (Homoptera : Cicadellidae)

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Abstract
Egg incubation, nymphal development, preovipositional periods, adult longevity and fecundity were measured for one temperate species (N. cincticeps) and three tropical species (N. nigropictus, N. virescens and N. malayanus) of green leafhoppers at different constant temperatures. Variations in these parameters were small among the three rice-feeding species, N. nigropictus, N. virescens and N. cincticeps. But the grass-inhabiting species, N. malayanus, differed significantly from these three species in its biotic characteristics. Different demographic parameters also were calculated and compared. The intrinsic rate of increase differed slightly among the four species of 20.degree. C, largest in N. cincticeps at 25 and 27.degree. C and largest in N. virescens at 30.degree. C.