Abstract
The effects of viral infection on the growth and yield of the cucumber (Cucumis sativus L.) line “Kyuri Ano 4”, with intermediate resistance to Melon yellow spot virus (MYSV), and susceptible cultivars were investigated. The growth of Kyuri Ano 4 plants infected with MYSV was inhibited much less than that of susceptible cultivars. In susceptible cultivars infected with MYSV, the leaves were small and growth of lateral branches was suppressed. The yields of Kyuri Ano 4 inoculated with MYSV were 79 to 88% of those of the healthy controls, and mosaic fruits were not observed. On the other hand, the yields of susceptible cultivars were only 32 to 52% those of the controls, and mosaic fruits were observed. We determined that resistance to MYSV in Kyuri Ano 4 is sufficient for managing spotted wilt caused by MYSV.
