What's eating my hairy stonecrop?

Hairy Stonecrop (Prometheum pilosum) is an alpine Crassulaceae grown as an indoor succulent, requiring very little water. Mealybugs are the most common pest, hiding in the plant's hairy leaf covering. Root mealybugs can be overlooked until the plant collapses. Fungus gnats indicate overwatering. Its dry cultural needs limit most pest problems.

White woolly masses in leaf axils; plant weakens and yellows; sticky honeydew Treat with isopropyl alcohol on a swab; follow with neem oil spray at 7–10 day intervals for several weeks

Wilting despite correct watering; poor growth; white woolly material on roots when unpotted Remove all soil, rinse roots, soak briefly in diluted neem, repot in clean dry gritty compost

Tiny flies around the pot; larvae damage hair-fine roots, especially on young plants Reduce watering substantially; apply Bti drench; top-dress with horticultural grit