Black Substance On House Siding

Use these simple landscaping tips to prevent this from happening.

Black substance on house siding.

Watch as lou manfredini ace s home expert shows you an easy and affordable way. In nature the artillery fungus shoots its spores towards sunlight. The black stains on the vinyl siding shown at left may be a fungus or a black agae. The dark spots are indeed spores but they do not come from your oak trees.

Shotgun fungus can shoot black spots on your house here s how to avoid the mess. Are those spots alive. In the absence of direct sunlight it shoots the spores at highly reflective surfaces such as white house siding. And of course the black spots show up better on white surfaces so they are noticed more easily.

But testing is probably not justified. They are the reproductive structures produced by artillery fungus sphaerobolus stellatus one of several fungi common on wood mulches used around plantings in home and commercial landscapes. By the growth pattern we think this is almost certainly a dark colored algae. A microscopy lab examination of a sample from this surface would be needed to know for sure.

Whether it s mold or mildew your siding is no place to have things growing.