Mold Mite (or Grain Mite)

Scientific Name: Tyrophagus putrescentiae

Order & Family: Sarcoptiformes, Acaridae

Size: 0.3–0.45 mm (nearly microscopic, appearing as moving white dust)

Mold Mite (or Grain Mite)

Natural Habitat

High-humidity environments, organic matter, kitchens, bathrooms, pantry items, and areas with mold or fungal growth.

Diet & Feeding

Mycetophagous; they primarily feed on mold, fungi, yeasts, and high-protein/fat stored foods like seeds, nuts, cheese, and grains.

Behavior Patterns

They reproduce rapidly in humid conditions (>60% RH). They are known for 'swarming' behavior where thousands appear as a fine, moving white powder on surfaces.

Risks & Benefits

They do not bite or sting but can cause 'grocer's itch' (allergic dermatitis) or respiratory irritation in sensitive individuals. They are nuisance pests that indicate a moisture or mold problem.

Identified on: 1/2/2026