What's eating my tropic snow dumb cane?

Tropic Snow Dumb Cane, one of the largest Dieffenbachia cultivars, is most vulnerable to spider mites and mealybugs. Its broad white-and-green leaves show mite stippling clearly. Scale can build up on thick stems. Good humidity and regular leaf-wiping prevent most infestations on this impressive statement plant.

Bronze or yellow speckles across the large white leaf centres; webbing on undersides; leaves lose their striking contrast Wipe all leaf surfaces with a damp cloth regularly; maintain humidity above 50%; spray neem oil or insecticidal soap weekly until clear

White cottony colonies at leaf nodes and along thick stems; sticky honeydew; leaves yellow and growth slows Apply isopropyl alcohol to visible colonies; treat with neem oil spray; check where stems meet the soil as bugs hide low on large plants

Brownish hard or soft bumps along the robust stems; sap-sucking weakens the plant; leaves yellow and drop from the base up Manually remove with a damp cloth or soft brush; apply horticultural oil; follow up with neem oil and inspect after 10 days