Experiments were conducted to identify, by in vitro dual culture tests, potential biological control agents producing antibiotics and to evaluate selected biological and chemical agents for control of stem canker caused by Botrytis cinerea on tomato plants (Lycopersicon esculentum) grown in yellow cedar sawdust in a research greenhouse. Four strains of Bacillus subtilis and one each of Enterobacter agglomerans and Rhodosporidium diobovatum were antagonistic towards B. cinerea in dual culture. Lesions in treatments with RootShield® and a strain of R. diobovatum were significantly shorter compared with the inoculated control. Plants treated with RootShield® or R. diobovatum had significantly higher total fruit yield than the inoculated control. The treatments with RootShield®, SoilGard®, and R. diobovatum produced significantly more total fruits than the inoculated control. The number of dead plants were significantly lower in treatments with RootShield® and R. diobovatum compared with the other treatments and inoculated control. These results suggest that RootShield® and R. diobovatum have the potential to control Botrytis stem canker and increase the fruit yield of tomato under greenhouse conditions.
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Utkhede et al. (2001) studied this question.
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