Several disease affect potato works , but the most coarse disease are blight , verticillium wilt disease and rhizoctonia canker . These diseases are easily identify and if treat early enough , the plants may be save . If the disease are not catch early enough , the entire plant should be removed . These disease are " transmittable " in that they spread from plant to found easily .
Blight
Blight starts out as light or dark green spot on the leaves . The place sometimes have gloriole . If the spots are still green , the disease is in its early stage . If not cared for immediately , the spots turn grim - brown or black with a purple tint .
To help forbid blight , check that the starter potato are gratuitous of disease . Choose cultivar that are resistant to blight . Some resistant cultivars are Sebago , Kennebec and Elba . If you feed the spud plants , habituate a fertilizer that has a broken nitrogen content . white potato vine should be grown in hills , not inseminate in dustup . The hill help foreclose blight .
Verticillium Wilt
Verticillium wilt usually set on the tater plants later in the season . One of the master and easy symptom is that the lower leaf on the plant commence to wilt . The stem remains strong , but more leaves begin to wilt and finally change state yellow . Verticillium wilt is a fungus that populate in the soil , on septic plant waste or in infected ejaculate potato .
If you notice verticillium wilt , constitute the potatoes in a different patch the next year . Rotate the planting area with other legumes or texture such as maize , oat , peas or rye . rough-cut drive of verticillium wilt let in in high spirits temperature and gamey moisture shortly after the seed potatoes are planted . Implement broad weed control around the potatoes and do not over - irrigate .
Rhizoctonia Canker
Rhizoctonia canker is see as brown - black lesion on the underground stems of the potato flora . The plant might look spindly or unaccented . trim the plants , if they are affected early in the season might write the plant . Eventually , if not catch , the leaves curl upwards and get a over-embellished or yellow tint .
To preclude rhizoctonia canker , be sure the source potatoes are disease devoid . If the white potato do foreshorten rhizoctonia canker , it may be treated with antimycotic agent . To help keep this disease from attack the white potato , check that the soil is at least 60 degrees Fahrenheit before plant .
