Abstract
A sap transmissible virus was isolated from peach seedlings grafted with plum and flowering cherry. The host range, thermal inactivation point (60-65C), dilution end point (10-4) and longevity (13-14 days) of this virus were about the same as those of cucumber mosaic virus (CMV). This virus was transmitted by Aphis gossypii and Myzus persicae from cucumber to cucumber. The particle was spherical with an approximate diameter of 30nm. The positive reaction was observed in agar-gel serological test with this virus and the antiserum of CMV-Y. From these results the virus was identified as CMV.
CMV was isolated by Aphis gossypii and Myzus persicae from 5 among 12 trees of flowering cherry variety Someiyoshino, but it was not isolated from trees of peach, plum, apricot and Japanese apricot. CMV was isolated not only from the trees showing line pattern symptoms but also from trees with healthy appearance. This suggested that CMV was not closely related to appearance of line pattern symptoms.
Among the several isolates of CMV isolated from Prunus plants, plum isolate-1 from variety Burbank belonged to ordinary strain of CMV, plum isolate-2 from variety Methley was a member of ordinary strain group having a wide host range on Cucurbitaceae and flowering cherry isolate from variety Someiyoshino belonged to Brassica strain.
The retransmission test of CMV from herbaceous plants to Prunus mahaleb seedlings by aphids was not a success.
