Bacteria found on American chestnut bark and their potential in biocontrol of chestnut blight

The goals of this study were to isolate bacteria on the bark of Castanea spp. that are (1) antagonistic to C. parasitica and (2) can survive an extensive period on the bark of American chestnut. [UMN]

"The American chestnut (Castanea dentata) became susceptible to a blight fungus (Cryphonectria parasitica) in the 1870s. This fungus was imported on seedlings from Asia,and American chestnut had no resistance to it. Since then,all attempts to eradicate or control the disease have met with failure or very limited success. This paper briefly reviews the history of the biocontrol of chestnut blight, from the use of "hypovirulent" strains of C. parasitica to the use of a bacterium of Castanea spp. that are 1) antagonistic to C. parasitica and 2) can survive for an extensive time period on the bark of C. dentate. The study reveals that some Bacillus megaterium isolates from C. dentata bark may have potential in biological control. The results also provide an explanation for the success of mud packs in "healing" cankers." [Abstract]