Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 Diseases of Truck Crops 21 not much can be done except to replant fields that have been badly at- tacked by the seedling form of the trouble. Southern Root Rot.—In this disease, the roots of growing plants in the field become affected with a rot which spreads from beet to beet. The fungus, Sclerotium Bolfsii, develops an abundant white mold on the beets and soil and on this growth are seen a great many small, round bodies of Fig. 9.—Fungus growth and sclerotia of Sclerotium Bolfsii. (From
Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 Diseases of Truck Crops 21 not much can be done except to replant fields that have been badly at- tacked by the seedling form of the trouble. Southern Root Rot.—In this disease, the roots of growing plants in the field become affected with a rot which spreads from beet to beet. The fungus, Sclerotium Bolfsii, develops an abundant white mold on the beets and soil and on this growth are seen a great many small, round bodies of Fig. 9.—Fungus growth and sclerotia of Sclerotium Bolfsii. (From Ext. Cir. 118.) about the size and color of mustard seed. These are the sclerotia (fig. 9), which act as the seeds of the fungus and help to spread it. This fungus attacks many different kinds of plants and persists for years in the soil after it once gets started. It requires rather high temperature and does not develop on plants grown in the winter in California. Land and crops infested with Sclerotium Bolfsii should be handled very carefully to prevent the further spread of the fungus. Bulbs, roots, or rooted plants which have grown in infested soil should not be planted in clean land. The dump screenings and trash and the wash water from sugar beets are also important means of distribution. Dump screenings should not be returned to the fields but should be piled on nonagricul-
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