Abstract: Using field pest density and the number of oviposition per unit area and the generational survival rate of A. spiniferus in laboratory as indexes, the resistance of 12 tea germplasm to A. spiniferus was studied. Relationships between leaf structure of 9 tea germplasms and the oviposition numbers of A. spiniferus and its generational survival rate were analyzed. The results showed that the resistance of You 510, You 3, Dangui, Yulong, Jiulongpao to A. spiniferus was stronger than that of G31, Baijiguan, Fuyun No.10 and Tieguanyin. The oviposition numbers of A. spiniferus was found to have significantly positive correlation with stoma density(R=0.7950, F=12.0267, P=0.0104) and thickness of spongy tissue(R=0.6790, F=5.9890, P<0.05), have significantly negative correlation with thickness of palisade tissue(R=-0.7187, F=7.4784, P<0.05) and nearly significantly negative correlation with thickness of cuticular layer on subepidermis(R=-0.6439, F=4.9591, P=0.0613). Meanwhile, the generational survival rate of A. spiniferus have nearly remarkably positive correlation with stoma density(R=0.6654, F=5.5605, P=0.0505), but extremely-marked negative correlation with thickness of subepidermis(R=-0.8390, F=16.6361, P<0.01), and extremely-marked negative correlation with cuticular layer on subepidermis(R=-0.7843, F=11.1886, P=0.0123), and extremely-marked negative correlation with thickness of palisade tissue(R=-0.8109, F=13.4414, P<0.01).

Key words: tea germplasm, leaf structure, Aleurocanthus spiniferus (Quaintance), pest resistance