Disease Note

Isolation of Cucumber Mosaic Virus from Tomatoes in the Sudan. P. R. Mills, Department of Agriculture for Northern Ireland, Belfast BT9 5PX. A. G. M. Abdul-Magid, Faculty of Agriculture, Shambat, Khartoum North, Sudan. Plant Dis. 69:1007. Accepted for publication 19 July 1985. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-1007e.

A cucumovirus was isolated from tomatoes (Lycopersicon esculentum Mill.) growing in the Shambat area of Sudan and showing a yellow mosaic and necrosis leading to plant death. The virus had a wide experimental host range typical of cucumber mosaic virus (CMV), although it did not infect Phaseolus vulgaris L. ‘The Prince’ and infected Cucumis sativus L. ‘Baton Vert’ symptomlessly (inducing few lesions when back-inoculated from this host onto Chenopodium amaranticolor Coste & Reyn.). Tomato plants inoculated with the isolate and kept in a glasshouse at about 20 C showed symptoms similar to, but milder than, those seen in naturally infected field plants. The virus was readily transmitted by Myzus persicae Sulz. In immunodiffusion tests, sap from infected tobacco plants gave a homologous reaction with antisera to CMV-G and CMV-To (both ToRS serotypes). There was no reaction to CMV-PY, PSV-W, PSV-V, PSV-E, or TAV (ATCC PVAS 127).