What's eating my hoya neoguineensis?

Hoya neoguineensis, like most hoyas, is most troubled by mealybugs and spider mites indoors. Mealybugs hide in leaf axils and along stems, sucking sap and leaving sticky honeydew. Inspect new growth closely and isolate any new plants before adding them to your collection to prevent infestations spreading.

White cottony clusters in leaf axils and stem joints; sticky honeydew residue on leaves Dab individual bugs with a cotton swab dipped in 70% isopropyl alcohol; treat the whole plant with neem oil spray weekly for 3–4 weeks

Fine webbing on undersides of leaves; tiny stippled yellow dots on the upper leaf surface; leaves may bronze and drop Raise humidity, rinse foliage with a strong water stream, then apply insecticidal soap or neem oil every 5–7 days until clear

Brown or tan dome-shaped bumps on stems and leaf midribs; yellowing foliage and sticky honeydew Scrape off visible scale with a soft toothbrush, then apply horticultural oil or 70% isopropyl alcohol to affected areas; repeat monthly