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Production of grapes is one of the important fruit enterprises in Egypt. Total acreage has increased rapidly during the past 20 years. It may become the second most important fruit, exceeded only by Citrus. From statistics of the Ministry of Agriculture in 1977, grape vineyards occupied about 48,169 feddans and produced 247,887 metric tons (1 feddan= 4201 m2). Since expansion of the grape industry, much attention has been directed to improv. ing yield and berry quality. Pollination requirements, a principle faotor in this respect, have been the subject of several investigations (CEJTLJN 1956; IYER and RANDHAWA 1964; SHARPLES et al. 1965; TuLAEVA 1971; FAINERMAN 1972; Wmss 1976).

Observations in Egypt showed that the yield of White Roumi (Vitis vinifera L.) was much less when planted alone than when grown wtth other grape varieties. Determining the pollina. tion requirements of this variety was the aim of the present study. Seven pollination treatments and serological tests for genetic relatedness were performed. to estimate the degree of self-and cross-compatibility for White Roumi flowers and four grape varieties as pollen sources.