What's eating my philodendron plowmanii?

Philodendron plowmanii is a terrestrial creeper grown indoors. Its large, corrugated leaves and chunky petioles provide good hiding spots for mealybugs. Spider mites strike in low-humidity conditions. Root mealybugs can go unnoticed in the soil. Inspect petiole channels closely and check roots at repotting.

White cottony wax in corrugated leaf channels, petioles, and stem base; sticky honeydew residue Remove visible colonies with alcohol; spray entire plant with insecticidal soap or neem oil; repeat weekly for 4 weeks

Unexplained wilting despite adequate watering; white powdery wax visible on roots at repotting Unpot, rinse roots, soak in dilute neem solution; repot in fresh soil; treat with imidacloprid drench

Pale, stippled patches on large leaves; fine webbing under leaf; leaf edges curl in dry air Wipe leaf undersides with damp cloth; apply neem oil spray; boost humidity with a humidifier or pebble tray