Black Spots On Siding From Mulch

Use big pieces of pine bark or other bark mulch which are a less hospitable place for the fungus.

Black spots on siding from mulch. You have to scrape them off and they leave behind a stain that is almost impossible to remove. What are these black spots on your house siding. Plant a low maintenance groundcover in the area instead of using mulch. Replace wood mulch with landscape fabric and small stones.

The black tar like spots that are all over your vinyl siding are more than likely a fungus called sphaerobolus stellatus better known as artillery or shotgun fungus. They are raised hard bumps. Davis of penn state. Others have said it s a fungus from mulch.

If you notice lots of tiny black or dark brown spots developing on your siding above a landscaped area of your yard as seen below it is most likely artillery otherwise known as shotgun fungus. The tiny dots are caused by what s called artillery fungus that grows in certain types of mulch. Some tell us it s from spiders. Although it s most often found on the east coast it can grow anywhere and especially thrives in areas that have cool damp springs or rainy fall weather conditions.

This will buy you a year before the fungus reaches to the top of the new mulch. The artillery fungus is a white rotting wood decay fungus that likes to live on moist landscape mulch.