Abstract
In the autumn and winter of 2005 severe attacks by a foliar disease were observed on rocket (Eruca sativa) in a commercial greenhouse in La Plata, Buenos Aires, Argentina. The disease affected newly expanded leaves of plants 15–20 days old. The etiology of the disease was investigated. The disease was identified as downy mildew caused by Peronospora parasitica. Pathogenicity was confirmed by pressing one adaxial infected leaf with abundant sporulation onto one adaxial healthy leaf. Downy mildew developed on inoculated plants after 8 days and the pathogen morphology matched that of the originally identified pathogen. In the same field, symptoms of downy mildew caused by P. farinosa were observed on swiss chard (Beta vulgaris var. cicla). The pathogenicity of this fungus on rocket was confirmed. This is the first report of downy mildew on rocket caused by Peronospora parasitica in Argentina.
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