Biology
Root rot is a fungal disease which attacks the roots and underground stems of beans. Young infected plants show reddish-brown streaking on the stem or taproots. The streaks spread until the entire lower stem and taproot are discolored and decayed, and secondary roots may also be damaged. Plants with badly damaged root systems show aboveground symptoms of disease, including stunting and yellowing of the plants, premature leaf drop, reduced yield, and plant death. The fungus overwinters in the soil in diseased plant debris and can also survive in the soil for many years.
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