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The purpose of this research was to reduce the percentage of deaths of Red Cherry tomato seedlings from root and crown rot disease, caused by Fusarium sp., with the use of microbial fungicides produced by The Royal Agricultural Station Inthanon. Tomato seeds were grown by the mixing of compost: with a ratio of coconut husk to peat moss (1:1:1) for 5 weeks. The experiment was designed as having five (5) treatments: treatment 1 was growing tomato seeds without using microbial fungicides; treatments 2-5 applied bottom holes consisting of PP-Strep to 1g/hole/plant plus spraying microbial fungicides. It was found that the best treatment was treatment 2 - applying with PP-Strep to 1g/hole/plant plus spraying microbial fungicides at weeks 2-4 of PP-B10 (200 g/20 L water), PP-Trichoderma (20 g/20 L water), PP-BK33 (100 g/20 L water) respectively. They had lowest seedling death percentage of 0.32%. The second best was treatment 4 - applying bottom holes with PP-Strepto 1g/hole/plant plus spraying PP-Trichoderma (20 g/20 L water) in week 4. This resulted in 0.64 % of seedling death. However, the highest death percentage of 7.37% was from treatment 1 which had disease control.
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