Biocontrol potentials of native bacterial strains for the management of coffee berry disease (Colletotrichum kahawae) in Ethiopia

Coffee berry disease (CBD) is a calamitous anthracnose of green berries of Coffea arabica L. caused by a fungal pathogen Colletotrichum kahawae Waller & Bridge. Coffee yield losses reach 80-100% on susceptible cultivars if effective control is not properly implemented. The antagonistic potential...

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Bibliographic Details
Published in:Biocontrol science and technology 2023-01, Vol.33 (1), p.98-114
Main Authors: Alemu, Kumlachew, Adugna, Girma, Lemessa, Fikre, Muleta, Diriba
Format: Article
Language:English
Subjects:
Anthracnose
Arabica coffee
Bacillus megaterium
Bacillus mycoides
Berries
Biological control
Coffea arabica
Coffee
Coffee berry disease
Colletotrichum kahawae
Conidia
Cultivars
Effectiveness
Fruits
Fungi
Fungicides
Germination
Hypocotyls
Inoculation
Pseudomonas spinosa
Reduction
Seedlings
Strains (organisms)
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Summary:Coffee berry disease (CBD) is a calamitous anthracnose of green berries of Coffea arabica L. caused by a fungal pathogen Colletotrichum kahawae Waller & Bridge. Coffee yield losses reach 80-100% on susceptible cultivars if effective control is not properly implemented. The antagonistic potential of 23 native bacterial strains, collected from Arabica coffee tree, was assayed against the fungus under in vitro and in vivo conditions. The strains were first tested for their antifungal activities on mycelia growth inhibition and suppression of conidia germination. Those promising strains were further evaluated for disease reduction and biocontrol efficacy in detached green berries and seedling hypocotyls of highly- and moderately- susceptible coffee cultivars. Among others, Bacillus cereus ECk-03, B. megaterium ECk-05, B. mycoides ECk-06, and Pseudomonas spinosa ECk-17 showed significantly (P 70%) at 48 h pre-fungal inoculation. The consistent performance of Bacillus megateriumECk-05, B. mycoidesECk-06 and P. spinosaECk-17 strains in antifungal activities and higher disease reduction suggest as potential biocontrol for the management of CBD encouraging organic coffee production.
ISSN:0958-3157
1360-0478
DOI:10.1080/09583157.2022.2163981