|Chen, J - UNIV OF TALLAHASSEE|
|Albibi, R - UNIV OF TALLAHASSEE|
Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: May 15, 2001
Publication Date: June 1, 2001
Citation: Chen, J., Albibi, R., Smith, B.J. 2001. Population dynamics of Colletotrichum acutatum and C. gloeosporioides causing fruit rots in the southeastern united states as inferred by rapid analysis. Phytopathology. 91:S16 Technical Abstract: Colletotrichum acutatum and C. gloeosporioides are important pathogens causing various fruit rots in the southeastern United States. The populations of the two pathogens, represented by 47 isolates, were studied using RAPD analysis. Based on the topology of the UPGMA tree and referenced to the distributions of each species, six RAPD groups were identified. Groups 1 (Sxy=0.68), 2 (Sxy=0.74) and 5 (Sxy=0.80) are exclusively strains of C. acutatum. Group 4 (Sxy=0.67) contains only C. gloeosporioides isolates. Group 3 (Sxy=0.66) includes isolates of both C. acutatum and C. gloeosporioides. The genetically distinct C. acutatum citrus strain and the C. fragariae isolates were placed in Group 6 (Sxy=0.63). Significant host specializations were found within isolates of both C. acutatum and C. gloeosporioides. A highly clonal strawberry strain of C. acutatum was identified. Data from this study also reveal possible cross host infections, which could be of epidemiological importance.