Bare root stock almond trees treated with 232 had a larger root number and root mass after 90 d than those treated with autoclaved or filter-sterilized bacterial suspensions, or with medium alone. Treatment with 232 also led to significant increases in leaf number, stem diameter and shoot elongation during the first growing season after treatment. The bacterium was recoverable from both the rhizosphere and the bulk soil around the treated roots, but never from uninoculated control roots. Thus, the reaction of almond to was not a pathological one even though this bacterium is classified as a pathogen.


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