Abstract:

The development of Oligonychus ununguis feeding on the leaves of Castanea mollissima BL.,Quercus acutissima Carr., Quercus variabilis BL.and Quercus dentata Thunb. was observed through leaf disk rearing method and the content of some chemicals in these leaves were determined. Results showed that, compared with the spruce spider mites feeding on the leaves of Castanea mollissima, Quercus acutissima and Quercus variabilis, the mites feeding on the leaves of Quercus dentata had the longest developmental periods, the shortest life span of adult females and the least ovipositional quantity. There were no significant differences among the development of the mites feeding on the leaves of Castanea mollissima, Quercus acutissima and Quercus variabilis. But the period of larvae feeding on the leaves of Castanea mollissima was short. Of these four plant species, Quercus acutissima, Quercus variabilis, Castanea mollissima and Quercus dentata, the content of free amino-acids, total nitrogen, total soluble sugar in the leaves of Quercus dentata was the lowest, tannin content was the highest. In the leaves injured by Oligonychus ununguis, the content of total free amino-acids, total nitrogen decreased and the content of soluble sugar, crude fat and tannin increased.

Key words: Host plant, Oligonychus ununguis, Chemical component, Development