What's eating my stapelia flavopurpurea?

Stapelia flavopurpurea is a compact stapeliad houseplant whose main pest risk is mealybugs — both the visible stem form and the hidden root form. Aphids may target flower buds and new growth. As with all stapeliads, overwatering leading to root rot is a greater killer than any pest, so lean conditions reduce all risks.

White waxy fluff on stems or between stem joints; root mealybugs cause wilting without apparent cause — confirmed by white residue inside the pot on unpotting. Swab stem infestations with 70% isopropyl alcohol. For root mealybugs, unpot, rinse and dry roots, repot into fresh gritty sterile mix. Apply a systemic insecticide drench for heavy cases.

Soft greenish or black colonies on new stem growth and flower buds, with sticky honeydew and possible sooty mould. Rinse off with water or wipe with a damp cloth. Spray with insecticidal soap or diluted neem oil and repeat until resolved.

Fine webbing and silvery speckling on stems in dry, heated rooms — more likely in winter when humidity drops indoors. Spray all surfaces with neem oil or insecticidal soap solution. Repeat every 5–7 days for three treatments. Improve air circulation around the plant.