Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: March 6, 2005
Publication Date: June 1, 2005
Citation: Pratt, R.G. 2005. Fungicide-based estimates of yield losses caused by fungal diseases in sod of forage bermudagrass in Mississippi [abstract]. Phytopathology. 95(Supplement):584. Technical Abstract: Species of Bipolaris, Curvularia, and Exserohilum may cause severe disease symptoms in foliage, sod, and roots of forage bermudagrass grown for nutrient conservation on sites where wastes from commercial animal production are disposed. To estimate forage yield losses caused by these and other fungal pathogens in sod, samples of diseased- and healthy-appearing bermudagrass sod from three swine waste application sites were grown in the greenhouse with and without weekly fungicide drench treatments. Loss estimates were based upon dry-matter yield increases observed in fungicide-treated samples in comparison to untreated samples. Mancozeb usually produced the greatest yield increases of three fungicides tested. In eight experiments with diseased-appearing sod, first-harvest losses in potential forage yield estimated with mancozeb were 0-57% (mean 37%). In five experiments with healthy-appearing sod, similar loss estimates were 0-35% (mean 16%). Results indicate that fungal diseases in sod and roots may cause major yield losses in forage bermudagrass grown for nutrient conservation on swine waste application sites.