White Cotton-Like Bugs on Your Plant: Mealybugs
Last reviewed: October 2026
Quick answer
White cottony fluff on a houseplant is often mealybugs, small soft-bodied insects that suck plant juices. Light cases can be wiped off with rubbing alcohol or washed off, and you need to repeat it. Heavily infested plants may be too damaged to save.[2][4]
Causes and how to tell them apart
White cotton-like fluff on stems and leaf joints[1][2]
How to tell: Both the bugs and their egg masses can look like bits of white cotton. Check where leaves join stems and along leaf veins, and under leaves.
Fluffy white egg masses[3]
How to tell: Egg masses are often the easiest sign to spot. They are covered with a fluffy white wax, even when the bugs themselves are tiny or hidden.
Sticky honeydew and black sooty mold[4]
How to tell: A shiny, sticky film on lower leaves or on surfaces below the plant points to sap-sucking pests. Black sooty mold can grow on it.
Yellow, wilting plant with white cottony masses at the drainage holes[1]
How to tell: Some mealybugs feed on roots. Small white cottony masses around the pot drainage holes are a clue, and the root ball may need checking.
Look-alike check: scale insects[1]
How to tell: Scale insects are relatives of mealybugs. Most mealybugs keep their legs for life and can move around, so a white bug that crawls is likely a mealybug.
Yellow leaves that drop (supporting sign only)[2]
How to tell: Mealybug feeding can turn leaves yellow and make them drop. Yellow leaves alone are not proof, so look for the white fluff before you decide.
What to do, step by step
- Move the infested plant away from your other plants and keep it isolated while you treat it.[4][1]
- For a small plant, wash the bugs off with a moderately strong spray of warm water.[1]
- Wipe the bugs and egg masses off with a cotton swab or cloth dipped in rubbing alcohol. Test on one leaf first and wait a few days, since alcohol can harm some plants.[4]
- Prune or pinch off badly infested leaves and shoots.[4]
- Check the plant again and repeat. Washing rarely gets every bug, so keep inspecting and treat again when you see more.[1]
- If you choose an insecticidal soap, horticultural oil or neem, it must touch the insects, so cover leaf undersides. Test on a leaf or two first, because soaps and oils can burn some plants.[3]
- If the plant is heavily infested, consider throwing it out before the bugs spread.[4]
How to prevent it
- Look over new plants before you bring them home, and keep them apart from your other plants for a while.[1]
- Check plants often, especially leaf joints and the base of stems, where small groups hide.[3]
- Do not overfertilize. Mealybugs like soft, lush new growth.[4]
- Do not move plants indoors from outside without a check. If you must, keep them isolated first.[4]
Not sure what is wrong? Scan your plant.
Scan your plantIf you grow one of these plants
- Colorado State Extension lists pothos among the plants most commonly affected by mealybugs.[2] Pet safety: Pothos
- Colorado State Extension lists jade plant among the plants most commonly affected by mealybugs.[2] Pet safety: Jade Plant
- Colorado State Extension lists African violets among the plants most commonly affected by mealybugs.[2] Pet safety: African Violet
- Colorado State Extension lists yucca among the plants most commonly affected by mealybugs.[2] Pet safety: Yucca
- Colorado State Extension lists Norfolk Island pine among the plants most commonly affected by mealybugs.[2] Pet safety: Norfolk Island Pine
Frequently asked questions
How do I know if the white stuff on my plant is mealybugs?
Look for white cottony fluff or egg masses where leaves meet stems, along leaf veins and under leaves. The bugs and their eggs both look like white cotton, and the bugs can move around.[1][2]
Does rubbing alcohol kill mealybugs?
For small infestations, dabbing them with a cotton swab dipped in rubbing alcohol is a common extension method, and it is repeated weekly until the bugs are gone. Test a small area of the plant first, because some plants are sensitive.[2]
Can mealybugs live in the soil or on roots?
Yes. Some mealybugs feed on roots. Signs can include yellow or wilting leaves and white cottony masses at the pot drainage holes. Root infestations are hard to control, so replacing the plant is often the practical choice.[1]
Related plant problems
Sources
- University of Wisconsin-Madison Extension: Mealybugs
- Colorado State University Extension: Mealy Bugs on Houseplants
- University of New Hampshire Extension: How do you get rid of mealybugs on houseplants?
- Washington State University Extension: Mealybugs
- Iowa State University Extension: Houseplant Pests: Mealybugs
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Buy Apollo a treatAlways confirm with a veterinarian or ASPCA Animal Poison Control (888-426-4435) before assuming safety. This is a household reference, not a substitute for professional guidance in a suspected poisoning.
Sources: the university extension and horticultural society pages listed above. Last reviewed October 2026.