What's eating my philodendron pedatum (oak leaf)?

Philodendron pedatum (Oak Leaf) is an indoor climbing aroid susceptible to common houseplant pests. Spider mites favour the finely lobed leaves, particularly in dry air. Mealybugs settle into the many leaf sinuses and petioles. Scale insects can appear on older stems. Inspect climbing supports and stems where pests hide.

Yellow speckling across the lobed leaf surface; webbing on undersides; leaves look bleached Mist and wipe leaf undersides; apply neem oil or insecticidal soap spray; raise ambient humidity

White fluff in leaf sinuses, axils, and along petioles; honeydew and associated sooty mould Dab with isopropyl alcohol; follow with a systemic drench (imidacloprid granules) for persistent infestations; re-inspect weekly

Immobile brown bumps on stems; yellowing, sticky foliage below colonies Scrub off with a soft brush dipped in soapy water; apply horticultural oil; repeat after 2 weeks