Study on Nutrient Conditions of Horned Gall Aphid and the Fertilization Effect of Rhus chinensis

The concentrations of some contents in the leaves of Rhus chinensis were studied in this paper. The results indicated that the concentration of vitamin C and total amino acids in normal leaves without gall were 1.15% and 11.1%. But it reduced rapidly to 0.68% and 7.85% in leaves with horned galls hosted. The concentration of soluble sugar and tannin acid also changed between the leaves with and without galls hosted. A hypothesis based on this evidence is proposed that the development of gall tissue and metabolizing of gall aphids depleted huge amount of the two kind of substance and lowered their contents in the leaves of host tree. The fertilization effect of young tree is carried out by pot experiment: the growth of height, caliper, fresh weight and the size of leaves were affected by add different quantities of nitrogenous or phosphate fertilizer, the concentration of vitamin C was more susceptible to fertilizer than that of tannin and soluble sugar.