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When foliage symptoms occur, they usually develop as plants are beginning to set pods. Light green to yellow blotches develop in the interveinal leaf tissue. Over time, the yellow areas turn brown. Upper trifoliolates may become brown and dry out. Brown stem rot causes a brown discoloration of the vascular tissues and center pith of the soybean stem that is evident when stems are split open. Initially the brown discoloration may be found in stem tissues close to the soil line and near nodes higher up on the plant. Later in the season, the brown discoloration may be almost continuous within the stem. Losses from brown stem rot are greatest when cool weather during pod-fill is followed by hot, dry weather. The fungus survives in crop debris and in the soil. Consider crop rotation and planting resistant varieties for control of brown stem rot. |
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