Abstract:

The morphological variations of different host populations of <i>Oligonychus ununguis</i> were compared with an optical microscope and a scanning electron microscope (SEM). Results showed that there existed differences in aedeagus of male adults, the epidermis of genital flap and its anterior area of female adults, the sensillum of palpal tarsus, the seta and empodium of legs of both males and females between <i>Castanea mollissima</i> population and <i>Cunninghamia lanceolata</i> population. Male aedeagus of the two populations were all hooked, but the hook of individuals from chestnut population was long and slender, tapering gradually from the curved position to the terminal, while that from fir population was shorter and finger-like, tapering sharply. The terminal sensillum of palpal tarsus of male adults from chestnut population was conical, while that of fir population was terete. Empodium I of the two populations were all claw-like, but that of chestnut population with slightly blunt terminal was thick and slightly curved, while that of fir population with pointed terminal was slender and strongly curved.

Key words: <, i>, Oligonychus ununguis, Castanea mollissima<, /i>, population, <, i>, Cunninghamia lanceolata <, /i>, population, morphological difference