In order to screen highly effective pesticide formulations for the control of soil-borne diseases of crops,the toxicities of m-methoxybenzoic acid,fosthiazate and their combinations on Ralstonia solanacearum,Fusarium oxysporum,and root-knot nematodes were determined under lab conditions.The results showed that the inhibitory activities of the mixtures of m-methoxybenzoic acid and fosthiazate on soil-borne diseases varied with the ratio changed.The mixture of m-methoxybenzoic acid and fosthiazate at the volume ratio of 1∶1 showed the highest synergistic effects on Ralstonia solanacearum and root-knot nematodes,with the SR of 1.67 and 1.83,respectively.The SR on Fusarium oxysporum was 1.16,showed the additive effect.The combination of m-methoxybenzoic acid and fosthiazate in a certain proportion could be used for the control of crop diseases caused by soil-borne pathogenic microorganisms.
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