Charcoal Rot in Soybeans

Charcoal Rot in Soybeans

In the last two weeks I have seen three fields of soybeans with what is probably Charcoal Rot.  One field was confirmed to be Charcoal Rot by the plant pathologist at OSU.  I think there will soon be many more.  All three fields were in the pod filling stage of their life cycle and were drilled not planted.

Charcoal Rot is caused by a soilborne fungus that can also attack corn, grain sorghum, and some weed species.

With Charcoal Rot, plants loose vigor, turn yellow, wilt and eventually probably die with the leaves remaining attached. If it is far enough along there is internal discoloration of the tap root.  Also there can be numerous black sclerotia form under the bark of the lower stem. 

Not really anything you can do about it once you have it.  Some control stategies include maintaining adequate soil fertility (including pH), reduce moisture stress ( as much as you can do about it) and avoid high seeding rates.

                                  picture of Charcoal Rot taken in Garfield Co.

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