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.
Downy mildew (legumes) [Peronospora viciae]
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.