Michigan State University Extension
Michigan Soybean Information - 00000017
11/16/00
Brown Stem Rot (Phialophora gregata)
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Losses from brown stem rot are greatest when cool wether
during pod-fill is followed by hot, dry weather.
External symptoms appear late in the season when leaves
show necrotic brown interveinal areas. Leaves later turn
dull brown, dry, and drop prematurely. Groups of
infected plants have a brownish cast and lodge. Stems of
infected plants show dull, dark reddish-brown
discoloration from roots to several external nodes and
within the stem (Vis. 1). The fungus survives in crop
debris. Consider crop rotation and planting resistant
varieties for control.
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This file was generated from data base S1 on 11/16/00.
Data base S1 was last revised on 11/16/00.
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