Abstract
Abstract Five apple species were grafted onto East Mailing VII, IX and 26 and Mailing Merton 104, 106 and 111 and 3 cherry species were grafted onto Mazzard F12/1 rootstock (a virus indexed clone) and grown in the field for one season. Determinations were made on graft success and plant response in the field. In October, representative graft unions of the 33 combinations were prepared, sectioned, and examined microscopically in an effort to find a rapid test for compatibility. The results of these microscopic examinations were correlated with the field results to see if one or more abnormalities could be found consistently in a significant number of grafts. Only a few grafts showed incompatibility characteristics which could be correlated to the field tests thus eliminating a quick microscope test. Anatomical abnormalities appeared to be the result of secondary influences suggesting that the biochemical factors probably control the compatibility or incompatibility of graft unions.
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