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Take-All Root Rot of St. Augustinegrass: First Report in Mississippi
M Tomaso-Peterson1, L E Trevathan1, M S Gonzalez1
1Department of Entomology and Plant Pathology, Mississippi Agriculture and Forestry Experiment Station (J 9680), Mississippi State University, Mississippi State 39762.
Take-all root rot, caused by Gaeumannomyces graminis var. graminis, has been identified in Mississippi St. Augustinegrass lawns. This fungal disease leads to significant turf damage and plant death.
Area of Science:
- Plant Pathology
- Mycology
- Turfgrass Science
Background:
- Take-all root rot is a destructive disease affecting St. Augustinegrass, previously reported in Florida and Alabama.
- In Mississippi, St. Augustinegrass lawns exhibited chlorotic and thinning patches, progressing to necrosis and death by late summer.
Purpose of the Study:
- To identify the causal agent of the observed St. Augustinegrass disease in Mississippi.
- To confirm the pathogenicity of the isolated fungus on St. Augustinegrass.
Main Methods:
- Isolation and identification of the fungal pathogen from symptomatic St. Augustinegrass tissues using potato dextrose agar (PDA).
- Pathogenicity testing by inoculating asymptomatic St. Augustinegrass sprigs with the isolated fungus (Gaeumannomyces graminis var. graminis) in a controlled greenhouse environment.
Main Results:
- Gaeumannomyces graminis var. graminis was successfully isolated and identified from diseased St. Augustinegrass.
- Greenhouse studies confirmed that G. graminis var. graminis caused typical take-all root rot symptoms, including necrotic roots, crowns, and chlorotic/necrotic leaves.
Conclusions:
- This study confirms the first report of take-all root rot caused by Gaeumannomyces graminis var. graminis on St. Augustinegrass in Mississippi.
- The findings highlight the disease's potential impact on St. Augustinegrass turf in the region.
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