What's eating my philodendron warscewiczii?

Philodendron warscewiczii, a large deeply-lobed climbing species, is most troubled by spider mites and mealybugs — the same culprits that affect most aroids indoors. Its large leaf surface area means mite populations can build up fast in dry conditions. Maintain humidity, inspect the complex leaf undersides carefully, and treat promptly with neem oil.

Pale stippling across the broad lobed leaves; webbing in the sinuses between lobes and on undersides; leaves may brown and crisp at margins Raise humidity; spray undersides and all surfaces with neem oil or miticide; repeat weekly for at least 3 weeks

White cottony masses in petiole joints and leaf axil crevices; honeydew; new growth distorted or fails to unfurl Dab with isopropyl alcohol; apply neem oil spray; isolate the plant and recheck every 10 days

Brown waxy bumps on stems and along main leaf veins; yellowing; sooty mold on lower surfaces Scrape off with a soft brush; apply horticultural oil spray; follow up monthly to catch crawlers