The best approach to green bean seedling disease control is to use a combination of management approaches which should begin at planting time. The following tips will improve chances for an early harvest. Use only healthy disease-free seed that will germinate and produce seedlings quickly. Poor quality seed germinate slowly and often are attacked by seedling diseases. Bean seeds saved from an earlier crop aren't always top quality, so purchasing new seed for the spring crop is a good investment.
New seeds are less likely to carry viruses and other disease-causing microorganisms as well.
Plant seeds which have been treated with a fungicide. Seed purchased from a dealer are generally treated with a fungicide such as captan or thiram, both of which protect seeds from seed rot and provide some disease protection for young plants a week or so after seedling emergence. Seeds treated with a fungicide can be identified by their red or green color. If you aren't sure whether a treatment is present on seeds, ask the seed salesperson. This fungicide provides additional protection from Rhizoctonia seedling disease when used according to product directions.