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United States Department of Agriculture

Agricultural Research Service

Title: Biocontrol of Fusarium Head Blight (Fhb) of Wheat: Influence of Spray Order of Pathogen and Antagonist Inoculum and Field Evaluation of Antagonists

Authors
item Khan, Naseem - OHIO STATE UNIV
item Schisler, David
item Boehm, Michael - OHIO STATE UNIV

Submitted to: American Phytopathological Society Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: August 16, 2000
Publication Date: N/A

Technical Abstract: Four different pathogen and antagonist inoculum application sequences were tested in the greenhouse. All four of the antagonists reduced visible disease severity even when applied 4 h after the pathogen inoculum (P=0.05). Hundred kernel weights increased in most cases. Bacillus strains were more effective in reducing disease than were yeast isolates (P=0.05). Three Bacillus strains and four yeasts were screened on the sof red winter wheat cultivars "Pioneer 2545" and "Freedom" in 1999 field trials at Peoria, IL, and Wooster, OH. Antagonists were applied at anthesis at 10% or 50% of the concentration of whole liquid culture broth. Four of the seven antagonists at Peoria and five of the seven at Wooster reduced FHB severity on "Pioneer 2545" at one or both concentrations (P=0.05). FHB severity was reduced by five of the seven antagonists at Peoria and three of the seven at Wooster on cultivar "Freedom." The best performing antagonists reduced FHB severity on both cultivars by ~80% and ~58% vs. controls at Peoria and Wooster, respectively.

Last Modified: 12/20/2014
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