1Songjiang District Vegetable Technology Extension Station of Shanghai，Shanghai 201611，China；2Songjiang District Xinbang Agricultural Technology Extension and Service Center of Shanghai，Shanghai 201605，China；3Shanghai Agricultural Technology Extension and Service Center，Shanghai 201103，China
Abstract：During the outbreak period of spinach leaf miner 〔Pegomya exilis（Meigen）〕，field trials on damages by leaf miner at different spinach varieties and growth periods were carried out in Shanghai．The results showed that sharp-leaf varieties were strongly resistant to leaf miner，and round leaf varieties were more susceptible，the imported red stem variety（Hongliancao rotundifolia）was highly susceptible．Spinach in growth period was strongly resistant to leaf miner before the 3-leaf stage and was the most susceptible after the 7-leaf stage．The reasons for the differences in insect resistance were preliminarily analyzed and cultivation techniques for controlling spinach leaf miner were put forward．
