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The bacterium  Pseudomonas entomophila  has been recognized as an exceptional species within the  Pseudomonas  genus, capable of naturally infecting and killing insects from at least three different orders.  P. entomophila  ingestion leads to irreversible gut damage resulting from a global blockage of translation, which impairs both immune and tissue repair systems in the insect intestine. In this study we isolated a  P. entomophila  bacterial strain from soil samples which displayed a strong activity against  Xanthomonas citri  subsp,  citri  ( Xcc ), the etiological agent of citrus canker disease. The antagonism potential of isolated bacteria against  Xcc  and its ability to reduce citrus canker severity was assessed both  ex planta  and  in planta . Our findings show that pathogenicity assays in  Citrus x limonia  by pressure infiltration and spray with a mixture of  P. entomophila  and  Xcc  leaded to a significant reduction in the number of canker lesions in high susceptible citrus leaves, at 21 days post-infection. To the best of our knowledge this is the first report of antibacterial activity of  P. entomophila  against a phytopathogenic bacterium. Collective action of  P. entomophila  factors such as diketopiperazine production and the type 6 secretion system (T6SS) may be involved in this type of biological control of citrus canker. The results suggest that the  P. entomophila  strain could be a promising biocontrol agent acting directly against  Xcc.

Bactericidal Effect of Entomopathogenic Bacterium Pseudomonas entomophila Against Xanthomonas citri Reduces Citrus Canker Disease Severity