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    Farming & Crop Protection Downy mildew (legumes)

    Downy mildew (legumes) [Peronospora viciae]

    In intensive cultivation, downy mildew may play a greater role. Direct yield losses are caused by the infection of the pods. Indirect yield losses may occur because of premature leaf drop.

    Pest Profile

    • Symptoms & Diagnosis

      Occurence

      The oospores surviving in the soil are considered the primary source of infection. In humid weather, the agent spreads very fast through the crop.

      Pattern of damage

      Broad bean: reddish-brown to black spots can be found on both sides of the leaf; the light (early) and dirty brown (later) spore layer can be found on the underside of the leaf. Pea: compressed/stunted plants, yellow leaf spots, brownish-black spots on the pods.

      Treatment

      Combat

      Adequate crop rotation must be followed. Multiple fungicide treatments should be performed from the beginning of infection.