Abstract
Abstract Sweet cherries (Prunus avium L.) budded on Mahaleb (P. mahaleb L.) in some instances exhibit incompatibility symptoms, but less frequently when on Mazzard rootstock (4). The symptoms of incompatibility of sweet cherry cultivars on Mahaleb are over-growth above the graft union and premature defoliation in the fall. Longitudinal sections through the graft union reveal a thick phloem and bark just above the graft union, whereas, no major abnormalities appear in the xylem area of the graft union (4).
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