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Diagnosis

A houseplant with sticky residue on leaves and yellow leaves

Sticky residue on leavesYellow leaves

Based on what you've described, these are the likeliest causes — ranked. Each one carries a tell-tale sign that distinguishes it from the others, and a single-minute check to confirm.

1Most likely

Mealybugs

Sap-sucking scale insects that hide in leaf joints and under leaves, protected by a waxy white coating that looks like small tufts of cotton. They excrete honeydew, a sticky, sugary residue that coats lower leaves and attracts sooty mold.

Tell-tale sign
White, cotton-like clusters tucked into the angle where a leaf meets the stem, often with a sticky film on leaves below.
60-second check
Touch one of the cottony spots with a cotton swab dipped in rubbing alcohol. If it's a mealybug, it'll turn brown and fall apart instantly.
2Also possible

Overwatering

The soil has stayed wet for too long, suffocating the roots and weakening the plant from the base up. It's the most common reason houseplants decline indoors, and it looks deceptively similar to thirst: a wilting plant in soggy soil is almost always drowning, not dry.

Tell-tale sign
Soil is wet more than an inch deep, and the lower leaves yellow or soften before the upper leaves change.
60-second check
Push a finger two inches into the soil. If it comes out cool and damp, the plant doesn't need water; it needs to dry out.
3Also possible

Root rot

Persistent soggy soil has killed part of the root system, and the fungal infection that follows is now attacking what's left. It's the advanced stage of overwatering: the plant is wilting because it physically cannot pull water up anymore, even from wet soil.

Tell-tale sign
The plant wilts even though the soil is wet, and the base of the stem feels soft or smells sour when you press it.
60-second check
Slip the plant out of its pot. Healthy roots are firm and pale; rotted roots are dark, mushy, and pull apart easily.
Read deeper
Two ants crawling along a green plant stem — ants on a houseplant are a reliable telltale of a honeydew-producing pest nearbyPests & Diseases

Sticky Residue on Houseplant Leaves: The 3 Pests That Cause It

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Green leaf dusted with white powdery mildew — one of the four things 'white fuzz on a plant' can meanPests & Diseases

White Fuzz on Plant Soil or Leaves: A Complete Identification Guide

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Macro close-up of a green aphid on a plant — one of the seven most common tiny bugs found on houseplantsPests & Diseases

What Are These Tiny Bugs on My Houseplant? A Visual Identification Guide

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Canonical combo: sticky-residue--yellow-leaves