Evaluation of antagonism by Trichoderma and Actinomycetes against Armillaria in vitro

Armillaria root rot is a devastating disease effecting cherry orchards in northwest Michigan. Currently there is no effective control for Armillaria. Soil-inhabiting microorganisms such as Trichoderma and Actinomycetes are successful in antagonizing fungal plant pathogens, causing a reduction in rad...

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Bibliographic Details
Published in:Phytopathology 2006-06, Vol.96 (6), p.S49-S50
Main Authors: Hollosy, SI, Hammerschmidt, R
Format: Article
Language:English
Subjects:
Armillaria
Prunus
Trichoderma
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Summary:Armillaria root rot is a devastating disease effecting cherry orchards in northwest Michigan. Currently there is no effective control for Armillaria. Soil-inhabiting microorganisms such as Trichoderma and Actinomycetes are successful in antagonizing fungal plant pathogens, causing a reduction in radial growth and biomass. Some rhizosphere-inhabiting microorganisms have reduced susceptibility of plants to infection by inducing systemic resistance in the host. The objective of this study was to evaluate the effectiveness of Trichodermal and Actinomycete antagonism against Armillaria. Actinomycete isolates were collected from soil in Michigan. In vitro experiments evaluated the efficacy of Trichoderma and selected Actinomycete strains on inhibiting growth and rhizomorph formation by Armillaria. All three Trichoderma isolates were able to completely inhibit Armillaria growth. Actinomycete isolate 57 was also able to completely inhibit Armillaria, while Actinomycete isolates 27, 44, and 48 inhibited Armillaria by approximately 40%. We are currently conducting a pot assay to test effectiveness of Actinomycete antagonism of Armillaria in the soil.
ISSN:0031-949X