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Special Root Rot Disease Management Plants
Avoid land that had soybeans, dry beans, or sugarbeets last year. All three crops are susceptible to the same strains of rhizoctonia root rot. If you have to plant soybeans back on a field that had soybeans last year, consider using a seed treatment that will help reduce the amount of rhizoctonia infection. The fungicide Vitavax can be used as a commercial seed treatment at the seed plant.
Another option is the use of Apron-Terraclor. This is a hopper box treatment that contains the systemic fungicide Apron for control of phytophthora and also Terraclor for control of rhizoctonia. Terraclor is not systemic, so may not provide protection beyond the seedling stage.
Rival fungicide can also be used, and has specific activity against rhizoctonia.
Avoid planting soybeans on land that tends to puddle or that has low spots. These conditions favor phytophthora root rot as well as root suffocation and micronutrient deficiency. If vigorous seed is planted, and no problems with rhizoctonia or phytophthora are anticipated, seed treatment may be unnecessary.
If phytophthora root rot has been a problem, plant a variety with resistance to the most common races. Race 3 is the most common race in our area, although several other races also occur.
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