Cankers and galls (bacterial)

Symptoms are characterized by the development of warty, cauliflower-like growths on the tubers and lower stem parts. These galls can vary in size and color, eventually darkening and decaying as the plant tissue breaks down. In severe infections, the entire tuber can be completely replaced by this spongy, proliferative mass.

The fungus thrives in cool, moist soil conditions where its zoospores can move freely to infect host tissues. The resting spores can remain viable in the soil for several decades, making the eradication of the disease extremely difficult. Human activities, such as moving infested soil, equipment, or infected tubers, are the primary drivers of long-distance spread.

The economic impact of potato wart is substantial, as it leads to total crop failure in infested fields. Due to its status as a high-priority quarantine pest, international trade of potatoes from infested areas is strictly regulated or banned. This causes not only direct financial loss to farmers but also disruption in regional agricultural markets.

Integrated pest management remains the most effective strategy for controlling potato wart. Key tactics include the mandatory use of resistant potato varieties, which is the only viable solution in known infested areas. Strict quarantine measures, including soil sanitation, decontamination of farm machinery, and crop rotation with non-host plants, are essential to prevent further geographic expansion.