In Minnesota, wetwood can be seen frequently on elm and poplar and also on fir, maple, mulberry, oak, willow and hemlock. Grass below the tree may be killed by the salts, alcohols and acids present in the liquid.As this liquid flows down the trunk, bark becomes initially stained dark black but eventually fades to a bleached tan or gray. In warm summer months, pressure builds in the affected wood and a foul smelling liquid, known as slime flux, is pushed out of the tree through cracks or wounds.Wetwood occurs when the wood of a live tree becomes water soaked and colonized by bacteria.Wetwood causes discoloration of bark, sapwood and heartwood of many different tree species.Slime flux coming out of a wound on a tree with wetwood Sooty mold can be physically washed off small plants if desired. Light coverings of the mold will gradually disappear during dry weather when its nutrient source is eliminated. Proper identification of the insect is necessary to determine if management is warranted. However, the presence of sooty mold is often an indication of insect activity that has the potential for causing damage. We do not recommend control of the mold itself.
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