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Colonization of Biocontrol Bacterium SW11 in Tomato Plants and Its Control Effect on Botrytis cinerea

We studied the colonization of the biocontrol agent, bacterium SW11, in tomato and its rhizosphere soil by using the antibiotic labeling. Results showed that strain SW11 colonized in tomato root, stem, leaves, and rhizosphere soil. Population was the highest at 5 days after applying the bacteria in tomato plants. At 30 days after applying the bacteria, population of SW11 was 1.31×104 cfu/g at root surface, 4.88×102 cfu/g in rhizosphere soil, 1.84×102 cfu/g in leaf surface, 0.87×102 cfu/g in stem outside, 20—65 cfu/g in the root, stalk and leaf inside. Bioassay indicated that fermentation liquid of the bacteria significantly suppressed grey mold disease caused by Botrytis cinerea. It prevented the disease by 88.15% at 7 days after application at 1.57×108 cfu/m L. This research showed that strain SW11 is of great potential to be a biocontrol agents in suppressing tomato grey mould disease.