Black to brown, sunken spots appear on the stalks near the ground. The plant starts to wither. Fruits turn black and start to shrivel up.
Spore cushions appear on the affected spots. The fungus spreads in the population via the spores that are transported through wind and rain. Spores can be stirred up from the soil by precipitation. Hibernation of the fungus takes place in plant residues, transmission via seeding material is also possible.
Remove infected plants as fast as possible. Disinfect poles and tools. Replacing the soil can produce good results.
Dicloran and Chlorotalonil can be useful to prevent new infections.