What's eating my philodendron subhastatum?

Philodendron subhastatum's distinctive bicolored leaves — green above, red-purple beneath — are targeted most often by spider mites and mealybugs. The rich undersides make webbing especially easy to spot. Maintain humidity above 55%, inspect weekly, and treat with neem oil at the first sign of pest activity to prevent rapid spread.

Tiny pale flecks on the green upper surface; fine webbing on the distinctive reddish undersides; leaves may curl and dry out Increase ambient humidity; apply neem oil or insecticidal soap spray to both leaf surfaces; repeat weekly until clear

Cottony white clusters at petiole joints and stem nodes; sticky residue; reduced vigor and yellowing of older leaves Alcohol swab for spot treatment; follow with a dilute neem oil full-plant spray; recheck every 10 days

Silvery streaking on leaves; distorted unfurling spathes; tiny brown frass visible on leaf surfaces Remove affected leaves; apply spinosad or insecticidal soap; use blue sticky traps to monitor adult populations