Resistance Evaluation of 9 Tomato Varieties against Tomato Yellow Leaf Curl Virus Disease in Greenhouse on Summer and Autumn

In order to explore the resistance and stability of tomato varieties against tomato yellow leaf curl virus disease( TYLCVD),9 tomato varieties of introduced and commonly used were tested for resistant comparison to TYLCVD in Tangshan areas during 2012- 2013. The results showed that the difference of 9 tomato varieties on resistance to TYLCVD was significant, there were no immune and highly susceptible varieties. Among them,Huiyu,Qidali,Xinhexie and Jingpeng105 with higher resistance,the highest disease index of them were 0. 80%,1. 25%,5. 75% and 11. 75%,respectively,in the two years. The susceptible varieties were Sadun,Jianqiang No. 3,Jinbeier No. 1 and FaleA155,the highest disease index were 20. 80%,41. 17%,41. 00% and 23. 50%,respectively. Results also showed that the incidence of disease of same variety was more serious in 2013 than in2012,incidence and disease index were all increased,the disease index of Huiyu and Qidali were increased by0. 47% and 0. 58%,the varieties with high and stable resistance,and the disease index of Jinbeier No. 1,Sadun,FaleA155 were increased by 19. 67%- 33. 83%,they were susceptible or unstable resistance varieties. So we should be careful screening when introducing or planting tomato varieties to promotion lasting and stable resistance varieties as far as possible.