White substance on the trunk of my lilac bush

Asked September 21, 2018, 7:21 PM EDT

There is a white substance growing on the main trunk of my lilac bush. It looks like a fungus, but on the typical lilac fungus. It is only on one side. Is it lichen or fungus? What’s the best course of action?

Dakota County Minnesota lilac wood rotting fungi

1 Response

The white patches shown in the photo are a kind of toothed crust fungus that often grows on dead and dying wood. It's presence suggests that the lilac trunk's days are probably numbered.

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When wood rot is present, nothing can be done to cure it. Some woody plants affected by fungal decay live for a long time but watch for evidence of its effects. Decaying trunks and branches that fail unexpectedly can be hazardous.