What's eating my philodendron radiatum?

Philodendron radiatum's deeply dissected, finger-like leaves create many sheltered spots where spider mites and mealybugs can establish. Spider mites are the most common indoor threat, especially in centrally heated rooms with low humidity. Inspect the sinuses between the leaf lobes closely. Neem oil spray and regular misting are reliable preventives.

Fine pale speckling between the dissected leaf lobes; webbing visible in the sinuses and on undersides; leaves yellow and dry out Shower plant thoroughly; raise humidity; apply neem oil or miticide spray into leaf sinuses and undersides; repeat weekly for 4 weeks

Cottony white colonies tucked in leaf-lobe crevices, petiole bases, and stem joints; honeydew; growth slows Use a fine brush with isopropyl alcohol to access crevices; follow with insecticidal soap spray; treat every 7–10 days

Larvae damage roots in consistently moist soil; adults are visible flying around the base; plant may show unexplained wilting Allow soil to dry more between waterings; apply Bti (Bacillus thuringiensis var. israelensis) drench; use yellow sticky traps