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Black substance on my bark dust #877045

Asked July 12, 2024, 9:45 PM EDT

Find this substance pop up at different times. Do you have any ideas what it is. Looks like black oil.

Multnomah County Oregon

Expert Response

Thank you for your question, Ken. Here is a Q & A on the same topic which should provide assistance: https://extension.oregonstate.edu/ask-extension/featured/black-slime-my-barkdust-concern
Good luck!

An Ask Extension Expert Replied July 16, 2024, 3:03 PM EDT

This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

Black substance on my bark dust #877045

Expert Response

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