Ring rot fungus refers to a parasitic plant pathogen that affects various species of plants, particularly potatoes. The term "ring rot" comes from the characteristic symptom it induces in infected plants, causing a dark to light brown discoloration that forms a ring or band around the tuber, resulting in rotting and decay. This fungus belongs to the bacterial genus Clavibacter and the species Clavibacter michiganensis subsp. sepedonicus.
The ring rot fungus primarily infects potatoes through wounds on the surface of the tuber, most commonly during harvesting or handling operations. It can also be transmitted through contaminated soil, water, or infected seed potatoes. Once inside the plant, the fungus grows and spreads, invading and colonizing various tissues, leading to the classic signs of rot and disease.
The consequences of ring rot infection on potato crops can be severe. It not only causes significant yield loss but also renders the affected tubers unsuitable for human consumption or seed purposes. Infected plants often exhibit wilting, yellowing, and stunted growth, while tubers may exhibit a soft, corky texture with a foul odor.
Prevention and control measures mainly rely on the implementation of strict hygiene practices, such as sanitation of equipment, proper storage, and use of disease-free seed potatoes. Timely identification and removal of infected plants or tubers, as well as crop rotation, can also limit the spread of the ring rot fungus. In some cases, chemical treatments may be employed, although their efficacy can vary. It is crucial to consult with agricultural experts or extension services for specific guidance on managing ring rot fungus in potato crops.
