Removing Sooty Mold from Decks Near Elm Trees

Power washing fails to remove black sooty mold on deck near elm tree. Need dissolving solution.

Sooty mold grows on honeydew from sucking insects (aphids, scales, webworms). Control insects → mold stops forming.

Fall webworms likely: gray silken webs on branch tips late summer. Unsightly but rarely harmful. Populations cycle every 4-7 years.

TSP (trisodium phosphate) + laundry detergent: Heavy-duty degreaser, removes soot.
Hy-Tech House Wash: Oxygen bleach concentrate, eco-friendly, safe for plants/pets.

After cleaning, oxygen bleach (sodium percarbonate) brightens wood without chlorine harshness.

Trees: Elm Trees with Holes in Leaves: Elm Leaf Beetle Damage; Chinese Elm Sudden Leaf Curl and Death: Root/Soil Trauma; Fall Webworm Nests in Trees: Harmless but Ugly—Management Options; Dutch Elm Disease vs. Herbicide Damage: Beetle Scars vs. Glyphosate Patterns; Fall Webworm Sacks on Walnut in Ohio: Identification and Control; Hawthorn Roots Near House: Fibrous, Non-Damaging; Borers in Chinese Elm: Organic Options Limited; Wasps Digging at Ash Tree Base: Ground Nesters, Not Borers; Elm Tree Holes: Sapsuckers or Borers?; The Majestic American Elm: A Comprehensive Guide to Identification, Care, and History

Garden Articles

Plants