Driveways, Walkways

Published on February 5th, 2013 | by Henri


“Slime mold” in driveway

Q.    My friend has a problem with a very large tar-and-chip driveway. They noticed a slime and took it to the Penn State Extension to find out what it is and were told it is “slime mold.” It’s slowly creeping all over the driveway. It is somewhat black and very slimy. Their grandson walked on it and it made prints where he walked after that.

They’ve tried different antifungal solutions that they got at the hardware store, and it did nothing. They have tried Clorox bleach, etc. They noticed that since the weather has gotten very hot (90 degrees F), it shrivels, but then as soon as the evening cools off or it rains, it is back. Please, I need to help them.

A.    Slime mold, a motile decay fungus, develops under wet conditions and grows very fast – almost visibly. The way to eliminate it is to dry the area up. This may require digging a ditch on one or both sides of the driveway to dry its bed up. The ditch or ditches should be filled with egg-sized stones for safety. Obviously someone knowledgeable needs to look at the situation to determine how best to accomplish this. Contact an excavating contractor, an American Society of Home Inspectors (ASHI)-certified home inspector, a professional engineer or an experienced general contractor for help.

A pest control operator can flood the affected area with Tim-bor to kill the fungus, but the moisture source must be eliminated or the slime mold will return.

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