What's eating my finger cactus?

Finger Cactus (Mammillaria vetula) is a clustering houseplant whose multiple offsets and tight growth can harbor mealybugs deep between stems. Root mealybugs in the soil are a stealthy secondary risk. Spider mites occasionally attack in dry conditions. Scale insects are rare but possible. Quarantine new cacti before placing them near your collection.

White cottony deposits in crevices between clustered offsets and at stem bases; honeydew and sooty mold may follow Swab affected areas with 70% isopropyl alcohol; spray the entire cluster with neem oil or insecticidal soap; repeat weekly for a month

White waxy residue on roots; plant wilts or shows no growth despite adequate watering Unpot, wash roots clean, allow to dry fully, and repot in fresh cactus compost; use an imidacloprid soil drench for persistent cases

Tiny webbing strands between spines; surface skin looks dusty, dull, and slightly scarred Mist with water to dislodge mites, then apply neem oil spray; repeat every 5–7 days; improve humidity around plants