Abstract: 【Aim】 Salicylic and jasmonic acids play important roles in inducing resistance to insects. This study aims to explore the induced resistance to phylloxera by salicylic and jasmonic acids in Kyoho grapevine. 【Methods】 Potted Kyoho grapevines were inoculated with grape phylloxera (Daktulosphaira vitifoliae) and sprayed with salicylic and jasmonic acids at the same time. Thereafter, the impacts of the above two hormones were detected and evaluated in the phylloxerainoculated grapevines, including the development and fecundity of phylloxera, the activities of antioxidant enzymes ［peroxidase (POD) and catalase (CAT)］, the content of malondialdehyde (MDA) in grape roots, shoot growth and the net photosynthetic rate. 【Results】 On the salicylic and jasmonic acidtreated grapevines, the total number of eggs per plant decreased by 41.35% and 50.00%, respectively, and the number of the 1st and 2nd instar nymphs of the next generation decreased by 42.31% and 50.00%, respectively, at 35 d after inoculation. After phylloxera infection, POD and CAT activities in grape roots increased first and then decreased, and were higher in salicylic and jasmonic acid-treated roots. The MDA content, however, was lower in salicylic and jasmonic acid-treated roots. Salicylic and jamonic acid treatment alleviated the growth depression caused by phylloxera. The growth of grape shoot and the net photosynthetic rate were remarkably decreased by 48.11% and 58.77%, respectively, at 30 d after inoculation. By contrast, the growth of salicylic and jasmonic acidtreated grape shoots decreased by 31.57％ and 25.71％, respectively, and the net photosynthetic rate decreased by 32.89％ and 24.67％, respectively. 【Conclusion】 Salicylic or jasmonic acid treatment can decrease the phylloxera population density, improve scavenging capacity of active oxygen and activities of defense enzymes, and alleviate the growth depression caused by phylloxera.

Key words: Grape, phylloxera, salicylic acid, jasmonic acid, insect resistance, defense enzymes