Slime Mold or Powdery Mildew on New Sod: Cosmetic, Not Catastrophic

Identification

Dark gray mildew-like coating on grass blades in full sun, irrigated 4×/week AM. Likely slime mold spores or powdery mildew.

Neither causes serious damage. Both disappear with weather change (drier, warmer/cooler). No treatment needed.

Lawns: Persistent Scale on Vines: Systemic Imidacloprid Solution; Powdery Mildew on Gardenia & Plumeria: Diagnosis & Treatment; Hydroseeding Mystery Material and Shrub Fertilization; Overseeding a Large Mature Lawn: Fertilizer First or Seed First?; Burnt Lawn from Broken Sprinklers: Runner Grasses Recover, Bunch Grasses Need Reseed; Condo Lawn All Weeds: Management Won't Act, Chemicals Off-Limits; Going Organic in Boston: What to Expect; Renovating Dead Lawn in SoCal After French Drain and Gopher Removal; Eliminating Mushrooms from Mushroom Compost in a Coastal Lawn; Diagnosing Brown Spots: Grubs vs. Disease

Garden Articles

Plants