ScreeningandIdentificationofTomatoAnti-virus Variety Against Tomato Yellow Leaf Curl Virus

To assess the resistance level of the new anti-virus tomato variety against tomato yellow leaf curl virus, the time of the virus affection, the disease incidence and the disease index of 18 tomato varieties are recorded in the field by the natural transmission with Jinpeng 1 and Jinman as the susceptible control. The resistance level is evaluated by PCR and ELISA. It is shown that the resistance varies significantly among the 18 tomato varieties. Two cultivars of Jinpeng1and Jinman are very susceptible, the disease incidences both reach 100% and the disease indices are both above 65.2. Three cultivars of Qiuguang 15-6, PC-88, and Qiuguang 69 show a high level resistance, the disease incidences and the disease indices are all 0. The rest 13 cultivars show different degrees of resistance levels, the disease incidences and the disease indices are between 5.6% and 45.2%, and 2.6 and 18.0, respectively.