Liquid inoculant for dry beans
All of the beans seeded in western Canada are treated with the fungicide captan and while it is effective against soil-borne root diseases it has been reported to inhibit symbiotic nitrogen fixation by Rhizobium. Therefore, we set out to isolate a strain of bean rhizobia that could nodulate and fix nitrogen in the presence of captan. Several strains of Rhizobium leguminosarum bv phaseoli were screened for tolerance to captan. One strain was advanced into greenhouse studies and inoculated onto pinto CV Othello seed treated with and without captan. Greenhouse studies showed that the captan tolerant strain of Rhizobium nodulated captan treated plants as well as plants not treated with captan. Field trials with inoculated captan-treated and untreated seed confirmed the results observed in the greenhouse. This strain of Rhizobium is commercially prepared in a liquid formulation and is available for farmers under the trade name “RhizUp™ for Beans”.
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