MANGO MALFORMATION IN FLORIDA: DISTRIBUTION OF FUSARIUM SUBGLUTINANS IN AFFECTED TREES, AND RELATIONSHIPS AMONG STRAINS WITHIN AND AMONG DIFFERENT ORCHARDS
Two strains of F. subglutinans from malformed 'Keitt' and 'Tommy Atkins' panicles caused vegetative and floral malformation on five of twelve 'Van Dyke' trees 4 mo after inoculation. Results from this experiment, and another in which symptoms did not develop, suggested that both wounding and timing of inoculation may be critical factors when artificially reproducing this disease.
The two strains used in inoculation studies and 53 other strains of the fungus recovered from the three 'Keitt' orchards above were in the same vegetative compatibility group (VCG); they apparently comprise a major, clonally related population of the pathogen. Compatibility was not apparent between nine remaining strains that were tested and the VCG above. These strains fell into five additional VCGs and may represent genetic variation within what may be a relatively homogeneous population of F. subglutinans on mango in Dade County.