What's eating my rhipsalidopsis gaertneri?

Rhipsalidopsis gaertneri (Easter cactus) is a forest epiphyte grown indoors and is vulnerable to mealybugs, spider mites, and fungus gnats. Mealybugs concealing themselves in stem joints are the most damaging pest. Keeping humidity moderate, avoiding waterlogged soil, and inspecting regularly prevents most infestations.

White waxy cottony fluff at stem joints and root collar; stem segments shrivel and drop prematurely Remove with alcohol-soaked cotton swab; apply neem oil spray to all crevices; repeat every 10 days until gone

Fine pale stippling on flattened stems; webbing visible in severe cases; stems lose color and vigor Mist regularly to raise humidity; apply insecticidal soap or neem oil; keep away from hot, dry heating vents

Larvae damage shallow roots, contributing to segment drop; adults swarm around moist soil Let the top inch of soil dry fully between waterings; apply Bti drench; use sticky yellow traps