The focal spots- and grease spots are among the most important bean diseases and are caused by fungi.
Both diseases differ externally in the color of the spots, the them on the leaves, Induce pods and seeds. The focal spot disease usually makes itself felt on the fleshy cotyledons through brown ones, often red-rimmed spots noticeable. The same phenomena can later be found in all parts of the plant. In greasy spots, the spots appear glassy-watery. Cold, damp weather promotes both diseases. On dry land, They rarely occur on light soils. Healthy seeds, which is pickled as a precaution, does not rule out later infestation, because the pathogens are also in the soil. Beans with pathological spots cannot be used for sowing. Pickling is also useless with them. The newer varieties are largely resistant to burning spots.