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"Artillery Fungus"

fungus on siding

If your siding, fence or any other surfaces around your house have broken out with a rash of black or dark-brown specks that do not want to come off, you are probably at war with something called artillery fungus..aka (shotgun fungus)

It has become increasingly common in recent years, according to experts who have been seeking ways to control and eradicate it.

Artillery fungus, also called shotgun fungus or Sphaerobolus stellatus, usually originates in wood-chip mulch that is used around shrubs, flowers and other plants. Wet, rotting mulch breeds small mushrooms that shoot off spores for distances of up to 20 feet. The spores, which are sometimes mistaken for insect waste or bits of tar, cling tenaciously to surfaces such as house siding.

“It’s just like Super Glue,” said Don Davis, professor of plant pathology at Pennsylvania State University’s College of Agricultural Sciences. Davis and Larry Kuhns, professor of horticulture, have been leading a five-year study of the fungus, and they expect the study to continue for several more years.

The fungus’ most active seasons – generally spring and fall when temperatures range between 50 and 68 degrees. The rapid spread of the fungus and the growing number of fungus-damaged homes appear to be linked to the growing use of mulches made from recycled hardwood scraps and tree stumps.

Homeowners can take a key step to control artillery fungus by cleaning up wood-chip mulch around the house and disposing of it before the shooting starts again in April or May.

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