Synergy Between Metalaxyl and Mancozeb in Controlling Downy Mildew in Cucumbers

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Abstract
A single foliar spray of either metalaxyl, mancozeb or a mixture of both was applied to cucumber plants in growth chambers or in the field 1 day before inoculating with metalaxyl-sensitive or metalaxyl-resistant strains of Pseudoperonospora cubensis. Disease records taken at 7 days after inoculation showed a greater efficacy of mixtures over that of each fungicide separately at corresponding concentrations. Synergy factor values (the relative increase in control efficacy) obtained for the metalaxyl-sensitive and -resistant strains in growth chambers were 1.09-1.36 and 1.12-2.90, and in the field 1.06-1.36 and 2.66-24.41, respectively.