Pest identification
What's eating my pincushion cactus?
Mealybugs
Signs: White woolly tufts between tubercles and at the base; sticky honeydew; plant may lose vigor.
Control: Use a fine-tipped alcohol swab to reach between tubercles; spray with dilute neem oil or insecticidal soap; repeat every 10 days until absent.
Scale insects
Signs: Hard or soft brown shell-like bumps on the stem body; honeydew; sooty mold in humid conditions.
Control: Remove individual scales with a toothpick or soft brush dipped in alcohol; follow with neem oil spray; inspect monthly.
Spider mites
Signs: Fine webbing across spines and at stem apex; stippled, dull appearance; worst in hot, dry indoor air.
Control: Rinse carefully with a fine stream of water; apply neem oil or a miticide spray; improve airflow and avoid excessively dry conditions.
Root mealybugs
Signs: Unexplained wilting; waxy white residue on roots visible when the plant is unpotted.
Control: Bare-root, remove all old mix, treat roots with neem or imidacloprid drench, and replant in fresh well-draining cactus compost.
Keep pincushion cactus pest-free
Healthy plants resist pests best. Get the basics right:
Pincushion Cactus pests — FAQ
What is eating my pincushion cactus?
Pincushion Cactus (Mammillaria crinita) is popular indoors and most commonly troubled by mealybugs sheltering between its tubercles, and by scale insects on the stems. Spider mites can appear in very dry indoor air. Root rot from overwatering weakens plants and invites root mealybugs. Keep it dry and well-lit to minimize pest risk.
How do I get rid of mealybugs on pincushion cactus?
White woolly tufts between tubercles and at the base; sticky honeydew; plant may lose vigor. Use a fine-tipped alcohol swab to reach between tubercles; spray with dilute neem oil or insecticidal soap; repeat every 10 days until absent.
How do I get rid of scale insects on pincushion cactus?
Hard or soft brown shell-like bumps on the stem body; honeydew; sooty mold in humid conditions. Remove individual scales with a toothpick or soft brush dipped in alcohol; follow with neem oil spray; inspect monthly.
How do I get rid of spider mites on pincushion cactus?
Fine webbing across spines and at stem apex; stippled, dull appearance; worst in hot, dry indoor air. Rinse carefully with a fine stream of water; apply neem oil or a miticide spray; improve airflow and avoid excessively dry conditions.
How do I get rid of root mealybugs on pincushion cactus?
Unexplained wilting; waxy white residue on roots visible when the plant is unpotted. Bare-root, remove all old mix, treat roots with neem or imidacloprid drench, and replant in fresh well-draining cactus compost.