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Sweet potato sprouts in the hotbed sometimes are affected with small, dry cankers along the stems due to infections with the fungus commonly known as Rhizoctonia. The lesions produced on sprouts are dark, sunken, have definite margins, ordinarily are oval or oblong, and usually are not more than 1/2 inch long. One lesion or numerous infections may be present on a sprout. The lesions may unite and form a larger affected area that may girdle the sprout. Infection occurs only to immature tissue that becomes more resistant as it matures. The sprout may rot off when infection occurs near the growing tip, but infections on older tissues result in smaller, localized lesions that usually do not kill the sprout. CONTROLThis disease is mainly a problem in the hotbed or on recently transplanted slips. Care should be taken to rogue infected plants from the hotbed. Hotbed soil should be changed or fumigated each year in order to prevent infections. |
This section was taken from Kansas State Experiment Station Bulletin 495.
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Web updated 9/01/06 |