Abstract
The effects of the age of moso bamboo (Phyllostaychs pubescens) leaves on the survival and oviposition of Schizotetranychus bambusae females were examined in the laboratory. The survival rate of mite females decreased much more rapidly when feeding on old leaves from old (second year or older) plants (OO) than feeding on young leaves, but this trend was stopped when the surviving females were transferred from OO to young leaves from young (first year) plants (YY) on days 11-13. These females quickly started oviposition on YY, although their ovipositional rate and fecundity was less and the duration of their oviposition period was shorter than mites feeding on young leaves from old plants (YO) or YY from the begining. These results confirm previous field observations that S. bambusae females were rarely found on old leaves and their damage was only observed on young leaves during spring and early summer in a big-harvest year when moso bamboo changes leaves.
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