Soak rutabegas for 20 minutes and turnips for 25 minutes. Dry, then dust with captan 50WP or thiram 75WP at 1 level teaspoon per pound of seed. Disease Control Damping-Off. Use hot water seed treatment.
Radishes are susceptible to clubroot, though turnips are resistant.
Of the radish varieties, Champion is quite susceptible. Leaf Spots and Downy Mildew. This disease is more severe under dry soil conditions, high soil pH, and low level of magnesium. Heavy irrigation in the first 2 weeks after emergence and the application of sulfur to reduce soil pH will assist in disease control. For radish only, at the first sign of disease in fields when Ridomil Gold 4E has been applied at planting, apply the following and repeat in 14 days.