|Khan, Naseem - OH STATE UNIV,COLUMBUS,OH|
|Boehm, M - OH STATE UNIV,COLUMBUS,OH|
|Lipps, P - OH STATE UNIV,COLUMBUS,OH|
Submitted to: National Fusarium Head Blight Forum Proceedings
Publication Type: Proceedings
Publication Acceptance Date: December 12, 2000
Publication Date: N/A
Technical Abstract: Six biological control agents were field tested for efficacy in reducing Fusarium head blight (FHB) of wheat in Illinois, Ohio, and North Dakota. All antagonists reduced FHB severity as compared to the buffer control in both Illinois and Ohio on the susceptible soft red winter wheat Pioneer 2545. Yeast OH 182.9 reduced disease severity by an average of 58% compared to the buffer control. Disease severity was very light on the moderately resistant cultivar Freedom with few treatments differing from the controls at either field location. In a field trial conducted in North Dakota, five of six antagonists decreased FHB severity on the hard red spring wheat Grandin compared to the untreated control. Inexplicably, the buffer and wetting agent control treatment also had one of the lowest disease severity ratings in contrast to 1999 and other 2000 field trial results. As observed in previous field seasons, yeasts OH 181.1 and OH 182.9 were among the most effective antagonists tested in the 2000 field trials. Further improvements in the level of control achieved using these antagonists will be sought via optimizing production media and formulations. Efficacy gains will also be attempted via the selection of fungicide insensitive variants of antagonists and their use in combination with fungicides registered for use against FHB.