What's eating my parodia microsperma?

Parodia microsperma is a small clustering cactus most commonly troubled by mealybugs hiding between offsets and among the dense spines. Root mealybugs in the soil are a less visible but equally serious risk. Spider mites occasionally attack plants kept in hot, dry positions indoors. Prompt quarantine limits spread across a collection.

White waxy wool between offsets and in dense spine clusters; weakened, etiolated growth and poor flowering Separate offsets to expose hidden colonies; treat with isopropyl alcohol and neem oil spray; repeat weekly; quarantine immediately

Plant wilts and fails to grow despite correct moisture levels; white powder and insects visible on roots when unpotted Bare-root and inspect; soak in systemic insecticide drench; dry fully for several days before repotting in fresh gritty compost

Stippled, dull or russet patches on the cactus skin; very fine webbing at spine bases in dry summer conditions Spray with insecticidal soap or neem oil; improve ventilation; avoid placing plant directly above radiators