1Wenzhou Science and Technology Professional School，Wenzhou 325006，Zhejiang，China；2Key Laboratory of Corp Breeding in Southern Zhejing，Wenzhou 325006，Zhejiang，China；3Cangnan County Agriculture Station，Cangnan 325800，Zhejiang，China；4Longwan District Agriculture Station of Wenzhou City，Wenzhou 325006，Zhejiang，China
Abstract：Tomato（Lycopersicon esculentum Mill.）seedlings were cultured by using 50 mesh insect nets covering + yellow board warming in advance + spraying insecticide timely．The results showed that the tomato seedlings grew neat and normally．It could isolate whitefly（Bemisia tabaci）effectively with average 12 per 100 plants whitefly adults．While in conventional land-based breeding，the whitefly adults could averaged 410 per 100 plants．The seedling spraying times were reduced by 4-5 times．The incidence of tomato yellow leaf curl virus（TYLCV）were 0.9 %-2.8 % with full coverage of 50 mesh insect nets，and the prevention and control effect were over 90 %．It can avoid economic losses of 6 329.5 Yuan per 667 m2．This technology was applied in Cangnan，Ryan，Ouhai of Wenzhou region in 2007-2009．It can prevent TYLCV successfully and the applied areas have reached more than 330 hm2.
