Identifying Common Indoor Plant Pests

By Emma Johnson · September 30, 2026

Why Indoor Plants Get Pests

Indoor environments lack natural predators that keep outdoor pest populations in check. A single infested plant can spread pests to your entire collection. Early identification is key.

The Big Five Indoor Plant Pests

1. Spider Mites

Signs: Fine webbing between leaves, yellow stippling on leaf surfaces. Nearly invisible — tap a leaf over white paper to see moving dots. Favorites: Palms, calatheas, spider plants, ivy.

2. Mealybugs

Signs: White cottony masses in leaf axils and along stems. Sticky honeydew on leaves. Favorites: Succulents, citrus, hoyas, orchids.

3. Fungus Gnats

Signs: Tiny black flies hovering at soil surface. Larvae in moist soil feeding on roots. Favorites: Any plant in consistently moist soil.

4. Scale Insects

Signs: Brown bumps on stems and leaf undersides that scrape off. Sticky residue on nearby surfaces. Favorites: Ficus, citrus, ferns.

5. Thrips

Signs: Silver streaks on leaves, deformed new growth, tiny dark specks. Adults are 1mm and jump when disturbed. Favorites: Monsteras, tradescantia.

Treatment Protocol

Isolate infested plants immediately. Spray spider mites and thrips with neem oil every 5-7 days for 3 weeks. Dab mealybugs and scale with rubbing alcohol. For fungus gnats, let soil dry between waterings and use yellow sticky traps.