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| Table: Diagnosis and Control of Bacterial Wetwood | ||
| Pest Identification | Host Plants | Damage Symptoms |
| Bacterial Wetwood of Elm Erwinia nimipressuralis, and other anaerobic bacteria |
Elm, oak, and other hardwoods. | The bark of infected trees appears brownish to gray in color. The discoloration of the bark is the result of bacteria oozing out of the tree. Bacterial ooze is usually associated with some type of wound. Bacterial ooze may smell foul. |
| Monitoring | Control Options | Pesticides |
| This disease does not need to be monitored. Elm trees appear to be predisposed to infection, while other hosts appear to be affected by site quality and tree vigor. | There are no control options. Do not insert pipes into the tree to help the tree drain. | None |
| Description and Life History | ||
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Description: Wetwood is caused by a bacterium that utilizes carbohydrates
(not cellulose) in the heartwood of the tree. Life history: Bacteria enter trees through wounds. Once inside, the bacteria multiply and begin to produce ooze, which flows out of wounds. Bacteria may be dispersed through rain splash and wind. Overwintering: Bacteria overwinter in the heartwood of the tree. | ||
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