Abstract
Abstract Cucumber systemic necrosis virus (CSNV), a strain of tobacco necrosis virus (TNV), was found occurring naturally on glasshouse cucumbers planted during the winter, and was transferred experimentally to produce symptoms in cucumber, french bean, cowpea, and tobacco. The virus was transmitted from cucumber to seedlings of cucumber and lettuce using isolates of Olpidium brassicae (Wor.) Dang. from lettuce as the vector. Light microscope studies revealed high concentrations of Olpidium sporangia and resting spores within roots of naturally infected cucumber plants. The host range, physical properties, serology, and electron microscopy of the virus identify it as cucumber systemic necrosis virus. a strain of tobacco necrosis virus. This is the first record of cueumber systemie necrosis virus in New Zealand.
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