Fusarium wilt of potato

Fusarium wilt of potato, also known as dry rot, is a destructive fungal disease caused by the soil-borne pathogen Fusarium solani. This disease affects the vascular system of the potato plant, leading to wilting, decline, and significant yield losses both in the field and during storage.

While potato is the primary host, Fusarium solani is a highly adaptable pathogen capable of infecting a wide range of crops, including tomatoes, peppers, eggplants, and various cereals. The fungus persists in the soil for several years on infested crop residues or as chlamydospores, posing a constant challenge to crop management strategies.

The initial symptoms usually appear during the flowering stage, characterized by the yellowing and rolling of upper leaves. As the infection progresses, the leaves become necrotic, and the entire plant wilts rapidly. A definitive sign of the disease can be seen by cutting the stem, which reveals browning of the vascular tissues due to fungal activity.

Favorable conditions for the development of Fusarium wilt include high soil temperatures and fluctuating moisture levels, which stress the plants and facilitate pathogen entry through the root system. In storage, the disease manifests as dry rot on tubers: the skin becomes wrinkled and sunken, and the internal flesh turns into a dry, light-colored mass of fungal mycelium.

• Implement a diverse crop rotation cycle of at least 3-4 years.
• Utilize certified disease-free seed tubers and treat them with appropriate fungicides.
• Ensure soil health and drainage to prevent the stagnation of water.
• Manage soil pests, such as nematodes, which create entry points for the pathogen.
• Store potatoes in cool, dry conditions with adequate ventilation to prevent rot development.