For each node, disease severity was visually assessed on stipules (the main photosynthetic organs of semi-leafless pea cultivars) and on pods using a 0–5 scale: 0 = no symptoms, 1 = a few necrotic flecks, 2 = numerous necrotic flecks, 3 = coalescing necrotic flecks covering less than 50% of the stipule or pod area, 4 = 50–75% of the area necrotic, and 5 = more than 75% of the area necrotic.