Potato scab bacteria is a type of bacterium that causes skin blemishes on potatoes. The spelling of this word follows the International Phonetic Alphabet (IPA) and can be pronounced as /pəˈteɪ.təʊ skæb bækˈtɪərɪə/. The first two syllables are pronounced as "puh-tay" while the last syllables are pronounced as "scahb bak-teer-ee-uh". Potatoes with scab bacteria are not harmful to human health, but they can affect the appearance and marketability of potatoes. Farmers use various measures to control the spread of scab bacteria, such as applying fungicides and planting healthy seed potatoes.
Potato scab bacteria refers to a group of bacteria that cause a plant disease known as potato scab. Potato scab is a common and economically significant disease that primarily affects potato plants. The bacteria responsible for this disease belong to the genus Streptomyces, with the most common culprit being Streptomyces scabies.
The bacteria infect the plant by entering through wounds in the tubers or through the roots and colonizing the surface of the developing potatoes. As they grow, these bacteria produce numerous elongated cells, which form chains on the surface of the tubers. This results in the formation of scabs or rough, corky lesions that are usually light brown to dark brown in color. These scabs can be small or large, covering a significant portion of the tuber's surface.
Potato scab bacteria thrive in dry and alkaline soils, with optimum growth conditions occurring at pH values between 6.5 and 7.0. They have the ability to survive in the soil for several years, even in the absence of a host plant. Additionally, the bacteria can persist on the surface of tubers, leading to the contamination of seed potatoes and facilitating the spread of the disease.
The presence of potato scab bacteria can result in significant yield losses and reduced market value for affected potato crops. Control measures include planting scab-resistant potato varieties, ensuring proper soil management, and minimizing wounds to the tubers during planting and harvesting. Various chemical treatments and crop rotations can also be employed to manage potato scab bacteria and reduce their impact on potato production.