Background/Objective.

Common bean (Phaseolus vulgaris) is mainly affected by the bacterium Pseudomonas syringae pv. phaseolicola (PSPH), which can cause severe economic losses. A sustainable alternative for its control is the use of antimicrobial agents such as actinomycetes. This study aimed to evaluate the effect of extracts from three actinomycete strains (ED65, ED66, and ED67) on the control of Pseudomonas syringae pv. phaseolicola in Phaseolus vulgaris under controlled conditions.

Materials and Methods.

Two mL of the actinomycete extracts were sprayed onto Azufrado bean plants, inoculated with PSPH. After 16 days, symptoms were assessed by the number of leaves showing spots, defoliation, number of spots per leaf, and disease severity using a damage scale.

Results.

A statistically significant reduction (P < 0.05), was found in the number of spots and disease lesions in plants sprayed with the extracts. The level of damage decreased significantly in plants treated with the ED65 and ED67 extracts, and the ED66 treatment showed no damage.

Conclusion.

According to the results of this study, strain ED66 showed the greatest potential for use as a source of antimicrobial substances for managing halo blight in beans, followed by ED65 and ED67.

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