What's eating my philodendron bipennifolium (horsehead)?

Philodendron bipennifolium (Horsehead) is a large indoor climber whose broad, horse-head-shaped leaves attract spider mites and mealybugs. The pronounced leaf lobes and petioles give mealybugs excellent hiding spots. Scale insects can establish on older woody stems. Regular inspection of the large leaf surfaces and climbing stem is essential.

Pale, dusty stippling across the large leaf surfaces; fine webbing on undersides; leaves yellow and drop Wipe leaves with a damp cloth; spray neem oil or insecticidal soap; raise humidity; repeat every 7 days

White cotton-like masses in leaf lobes, axils, and petiole bases; sticky honeydew residue Dab colonies with alcohol swab; drench with insecticidal soap solution; isolate plant and re-check weekly

Brown or white dome-shaped bumps fixed on stems; leaves turn yellow; plant weakens over time Scrape off with a soft brush; apply horticultural oil spray; repeat treatment after 14 days