الفهرس 
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Abstract
The present investigation was planned to identify, and to through some lights on some biological properties of the etiological agent of a severe virus disease naturally encountered on grapevine (Vitis venifera L.) cultivar Roomi-Red in minia.
Extensive studies of the host range and sYmptomology, together with physical properties determinations and serolo¬gycal tests revealed that the causal agent of the disease is a strain of tomato ringspot virus ( Tom RSV); thus, this is the first record on Tom RSV on grapevine in Egypt.