Abstract2‐Methoxyethylmercury chloride (MEMC) applied to cowpea seeds withRhizobiumprovided little or no control of seedling rot caused byRhizoctonia solani; similar treatment, but withoutRhizobium, gave>40 control of disease. Treating seeds with quintozene and then withRhizobiumrendered the fungicide completely ineffective againstR. solaniinfections; disease control was>70 when seeds were treated with quintozene only, and>60 when seeds were coated first withRhizobiumand then with quintozene; treatment with quintozene+Rhizobiumgave about 25 control. Simultaneous treatment withRhizobiumconsiderably reduced the efficacy of captafol, chloroneb, carbendazim and thiophanate‐methyl. Disease control by carboxin, benomyl and thiabendazole remained unaltered in the presence ofRhizobium, but only thiabendazole gave good control. Seeds treated with MEMC andRhizobiumproduced seedlings without root nodules; nodulation was also decreased by captafol and by carboxin but six other fungicides had no effect. The implications ofRhizobium‐fungicides interactions are discussed in the context of fungicidal control of root dis
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