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Biological control of fusarium dry rot of potato tubers under commercial storage conditions

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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 byGibberella pulicaris (anamorph=Fusarium sambucinum) has been demonstrated in laboratory studies but not in commercial storage environments. Several Gram-negative bacterial strains that were efficacious and amenable to production in liquid culture in laboratory studies were selected for pilot studies in Idaho and for bin trials at commercial storage houses in Idaho and North Dakota. In the first year of pilot studies,Pseudomonas fluorescens S22:T:04 (≈1 x 108 cfu/ml) decreased dry rot caused byG. pulicaris by 19% when coinoculated with the pathogen compared to controls and to the fungicide thiabendazole (TBZ) applied at label rates. In second year pilot studies,P. fluorescens P22:Y:05 andEnterobacter cloacae S11:T:07 (≈4 x 108 cfu/ml) reduced the severity of disease incited byG. pulicaris (25% and 17% average disease decrease, respectively) when antagonists were applied after pathogen inoculum. Treatment effects on dry rot that developed from inoculation withNectria haematococca (anamorph=Fusariumsolani var.coeruleum) were variable and influenced by interactions between antagonists, a wetting agent, and TBZ. In commercial storage bin trials,E. cloacae S11:T:07 reduced naturally occurring levels of dry rot by an average of 21% compared to 14% for TBZ, demonstrating that this antagonist was effective when produced using a liquid culture medium and methodology that approximates commercial practices for producing biomass.

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Authors and Affiliations

  1. National Center for Agricultural Utilization Research, USDA-ARS, 61604, Peoria, IL

    David A. Schisler, Patricia J. Slininger & Rodney J. Bothast

  2. Kimberly Research & Extension Center, University of Idaho, 83341, Kimberly, ID

    Gale Kleinkopf

  3. United Agri. Products, 80632, Greeley, CO

    Richard C. Ostrowski

Authors
  1. David A. Schisler
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  2. Patricia J. Slininger
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  3. Gale Kleinkopf
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  4. Rodney J. Bothast
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  5. Richard C. Ostrowski
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Correspondence to David A. Schisler.

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Schisler, D.A., Slininger, P.J., Kleinkopf, G. et al. Biological control of fusarium dry rot of potato tubers under commercial storage conditions. Am. J. Pot Res 77, 29–40 (2000). https://doi.org/10.1007/BF02853659

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