The isometric virus isolated from several lettuce plantations appeared to be dandelion yellow mosaic sequivirus. Despite of some differences it seemed to be closely related to Dutch Ls2 isolate. Identification was based on the host range, physico-chemical properties, electron microscopy and serology. The differences in virus susceptibility were found between 12 cultivars mechanically inoculated. None of approximately 1500 seedlings of 9 cultivars, derived from infected plants, was virus infected.
Most of the surveyed lettuce field plantations in central region of Poland were shown to be virus infected. Percentage of infected plants was however low. Five viruses have been isolated and identified, namely lettuce mosaic potyvirus (LMV), dandelion yellow mosaic sequivirus (DYMV), lettuce big vein varicosavirus (LBVV), tomato mosaic tobamovirus (ToMV) and cucumber mosaic cucumovirus (CMV). Most frequently occurred LMV and DYMV. CMV and ToMV were isolated accidentally.
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