Abstract
Sap transmissible viruses were isolated from peach var. Nakayamakinto and sour cherry var. Montmorency provisionally laveled isolate-1 and -2.When buds from Nakayamakinto were used to infect the seeedlings of Prunus species, they induced necrotic ringspot in Mazzard, no symptom in mahaleb, top necrosis of young shoots in flowering cherry var. Magofugen and necrosis and gummosis in var. Shirofugen. Isolate-1 caused chlorotic ringspot and top necrosis in cucumber, chlorotic ringspot on inoculated leaves but not infected systemically in squash, vein necrosis on inoculated leaves and necrotic stem streak in asparagus bean and local chlorotic spot and mottle in Chenopodium amaranticolor. This isolate had a thermal inactivation point of 50-55°C, a dilution end point between 1/100 and 1/500 and longevity was 7-10 hours.In the case that Montmorency was used for inoculum to seedlings of Prunus species it caused dwarf in mahaleb, necrosis and gummosis in Shirofugen and no symptom in Mazzard and Magofugen. When isolate-2 was used for inoculum, cucumber reacted with mild chlorotic spot on inoculated cotyledons and with mosaic and marformation on young leaves. Squash, tobacco and zinnia were systemically infected with isolate-2 and produced bright yellow vein banding and mosaic on squash and chlorotic ring or mottle on tobacco and zinnia. The thermal inactivation point of isolate-2 was 45-50°C, dilution end point was between 1/50 and 1/100 and longevity was 4-5 hours.On the basis of these host ranges, symptomatology and physical properties isolate-1 was identified as peach necrotic ringspot virus (NRSV) and isolate-2 was identified as prune dwarf virus (PDV).
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