Management of bacterial spot of tomato with phosphorous acid salts |
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Authors: | Aimin Wen Botond Balogh M Timur Momol Stephen M Olson Jeffrey B Jones |
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Institution: | aNorth Florida Research and Education Center, University of Florida, Quincy, FL 32351, USA;bDepartment of Plant Pathology and Ecology, The Connecticut Agricultural Experiment Station, 123 Huntington Street, P. O. Box 1106, New Haven, CT 06504, USA;cPlant Pathology Department, University of Florida, 1453 Fifield Hall, Gainesville, FL 32611, USA;dDepartment of Plant Pathology, NDSU, Dept 7660 P.O. BOX 6050 Fargo, ND 58108-6050, USA |
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Abstract: | Phosphorous acid salts (PASs) were evaluated alone or in combination with other products for managing bacterial spot of tomato in greenhouse and field experiments in Florida during a 3-year period. Field treatments included a weekly schedule of PAS alone, PAS combined with standard copper-bactericide at full rate or half rate, PAS alternated with a standard copper-bactericide, and PAS every week plus biweekly applications of acibenzolar-S-methyl (ASM). Field data showed that disease control with PAS combined with standard copper-bactericide full rate, PAS alternated with a standard copper-bactericide, and PAS every week plus biweekly applications of ASM was similar to that obtained using the standard copper-bactericide program. In greenhouse experiments PAS alone had a similar level of disease compared to the standard program, whereas PAS combined with standard copper-bactericide full rate was significantly better than the standard program. Yields in the field experiments were not affected by any of these treatments. Phytotoxicity was observed when PAS was applied to the foliage of tomato seedlings under greenhouse conditions. These data suggest that PAS combined with standard copper-bactericide full rate and PAS plus ASM could be used for managing bacterial spot of tomato in the field in Florida. The mode of action of PAS is still unclear, as it only slightly affected multiplication of Xanthomonas perforans in vitro, and was also ineffective as a plant activator. |
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Keywords: | Integrated disease management Solanum lycopersicum |
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