What's eating my maranta leuconeura 'mint'?

Maranta leuconeura 'Mint', like all prayer plants kept indoors, is most commonly attacked by spider mites in dry air and mealybugs in sheltered leaf axils. Fungus gnats thrive if the soil is kept too wet. Aphids and scale occasionally appear. Consistent humidity and avoiding overwatering prevent the majority of issues.

Silvery stippling and fine webbing on leaf undersides; foliage looks dull and dusty in low humidity. Raise humidity with a pebble tray or humidifier; spray undersides with neem oil or insecticidal soap weekly until clear.

White cottony clusters in leaf axils and along stems; sticky honeydew and stunted new growth. Dab individual colonies with isopropyl alcohol on a cotton swab; apply neem oil drench; isolate affected plants immediately.

Adult flies hover around soil; larvae feed on roots and organic matter, causing wilting in young or stressed plants. Allow the top 2–3 cm of soil to dry between waterings; use sticky yellow traps; apply a BTi (Bacillus thuringiensis israelensis) soil drench.