Short answer
White fuzz on your Aloe vera is almost always a sign of a mealybug infestation, which manifests as cotton-like secretions in the crevices of the leaves. The most effective fix is to manually remove the pests with a cotton swab dipped in 70% isopropyl alcohol and treat the plant with insecticidal soap.
While Aloe vera is a hardy succulent, it is prone to pests that exploit its leaf structure. Discovering white, fuzzy material—often mistaken for mould—is a sign of a mealybug colony and should be treated promptly to prevent the insects from sucking the sap and weakening the plant.
Mealybugs are small, sap-sucking insects that protect themselves with a waxy, white, cottony substance that looks exactly like mould. They tend to congregate in the tight crevices where the Aloe leaves meet at the base.
Check: Touch the white fuzz with a toothpick; if it is sticky, soft, and you see tiny, slow-moving pinkish or white insects underneath, it is definitely mealybugs.
Fix: Dab the white spots directly with a cotton swab soaked in 70% isopropyl alcohol to dissolve the wax and kill the insects, then apply insecticidal soap weekly until no fuzz remains.
Though rare in dry environments, if the Aloe is kept in an area with poor airflow and high humidity, Botrytis can manifest as a fuzzy grey-white growth. This usually occurs if the plant has been sitting in damp soil for too long.
Check: Check the soil moisture level; if the soil is consistently soggy and the base of the plant feels soft or mushy, the fuzz is likely fungal.
Fix: Immediately improve air circulation, stop all watering until the soil is bone-dry, and prune away any severely decayed or mushy leaf tissue.
Occasionally, hard water minerals can accumulate on the surface of the Aloe vera leaves after misting or splashing, creating a crusty, whitish residue. This is not alive and does not spread like mould.
Check: Wipe the area with a damp cloth; if the white substance dissolves easily or wipes away clean without leaving a soft, web-like residue, it is likely mineral buildup.
Fix: Switch to distilled or filtered water for your plant and avoid overhead watering to prevent mineral spots from reforming.
When to worry
You should act immediately if the fuzz is accompanied by soft, translucent, or brown mushy spots on the leaves, as this indicates the plant's health is rapidly declining due to rot.
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Diagnose my Aloe VeraYes, neem oil is effective against mealybugs, but be careful not to apply it while the plant is in direct, harsh sun, as this can cause leaf burn on the sensitive Aloe foliage.
If the infestation is limited to the leaves, you can treat it topically. However, if you see white cottony growth in the soil, repot the plant in fresh, well-draining cactus mix and discard the old contaminated soil.
Yes, mealybugs are highly mobile and can quickly spread to nearby plants. Isolate your infected Aloe immediately to protect your other succulents.
Consistent with guidance from: Royal Horticultural Society, University of California Agriculture and Natural Resources.