|Kleinkopf, Gale - UIKREC|
|Ostrowski, Richard - UNITED AGRI PRODUCTS|
Submitted to: Potato Association of America Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: August 7, 1997
Publication Date: N/A
Technical Abstract: Lack of effective chemicals impedes control of Fusarium dry rot of stored potato tubers destined for processed and table stock use. Biological control of dry rot incited by Fusarium sambucinum (teleomorph=Gibberella pulicaris) has been demonstrated in laboratory studies (Plant Dis. 78:251-255). Several Gram-negative bacterial strains that were efficaceous sand amenable to production in liquid culture were selected for pilot studies at the University of Idaho, Kimberly Research and Extension Center and for bin trials at storage houses in Idaho and North Dakota. Fluorescent Pseudomonas strain S22:T:04 (~1 x 10**8 cfu/ml) decreased the level of dry rot in year one trials when coinoculated with the pathogen compared to controls and the fungicide Mertec 340F. In second year studies, P. fluorescens strain P22:Y:05 and Enterobacter cloacae strain S11:T:07 (~4 x 10**8 cfu/ml) controlled F. sambucinum (25% and 17% avg disease decrease, respectively) but not F. coeruleum when antagonists were applied 24 h after pathogen inoculation. E. cloacae S11:T:07, produced in liquid culture, reduced naturally occurring levels of dry rot by an average of 21% for all bin trials compared to 14% for TBZ.