Cucumber mosaic virus (CMV) appears to be one of the most widespread pathogens on beans. In the present research, 49 Iranian lines and cultivars of common bean (Phaseolus vulgaris) were screened for their reaction to CMV. Plants at primary leaf stage were inoculated with CMV by rub inoculation and then they were kept in an insect-proof growth chamber at 20 °C. Three weeks postinoculation, inoculated plants were assayed based on their symptoms, growth rate, fresh and dry weights and virus titer. Results of the present study showed that a line, D81083, had moderate resistance, six lines and cultivars were found to be tolerant to the CMV and 42 lines were found to be susceptible, these plants exhibited severe symptoms and accumulated high levels of virus titer. However in the present research one moderately resistant line and six tolerant lines and cultivars were identified for use in breeding and cultivation and also for future on researches bean.
