Plant care guide
How to Prevent Mealybugs on Aloe Vera (and Clear Them)
Updated
Why does my Aloe vera have mealybugs?
Mealybugs reach an aloe on another infested plant and then crawl to neighbours. Prevention is mostly about what you bring home and how you check it: quarantine new plants, inspect the leaf bases and roots, and keep pots from touching.
What to do first
Quarantine every new succulent for several weeks and check where aloe leaves join the base. If you find cottony tufts, isolate the aloe, rinse it, and dab each mealybug with rubbing alcohol, repeating until no new ones appear.
If you have lost a succulent to mealybugs, it makes sense to want to keep them off your aloe. NC State Extension lists mealybugs among the insects that may affect Aloe vera. The good news: prevention is mostly about habits, not sprays.
How mealybugs reach an aloe
- On new plants. Colorado State Extension says mealybug infestations are almost always established from plants recently bought or received as gifts (CSU: Managing Houseplant Pests).
- By crawling. UW–Madison Extension says mealybugs crawl easily between plants, especially where leaves overlap. One infested pot can spread them through a whole windowsill of succulents (UW–Madison: Mealybugs).
- In soft growth. Colorado State advises growing plants at a moderate pace, because many mealybugs favour succulent growth. Avoid pushing an aloe with heavy feeding.
Prevention habits that work
- Quarantine new arrivals. Clemson Extension suggests keeping new plants apart for six weeks and checking them about once a week (HGIC 2252). Colorado State gives at least three weeks as a minimum.
- Inspect before you buy. Look deep between the leaf bases, where the rosette is tight. Iowa State Extension says mealybugs show as cottony masses along veins and where leaves and stems join (Iowa State: Common Problems of Succulents).
- Check the drainage holes. UW–Madison says small white cottony masses around drainage holes suggest mealybugs on the roots.
- Keep pots apart. Leaves of neighbouring plants should not touch.
- Grow it hard, not soft. Penn State Extension recommends a coarse, well-draining mix, full sun to bright indirect light, and watering thoroughly only when the surface is dry (Penn State: Aloe). In winter, reduce water so the mix is barely moist.
- Look when you water. Iowa State recommends scouting succulents frequently and treating as soon as you see mealybugs.
If you find them anyway
- Isolate the aloe so mealybugs cannot crawl to other pots.
- Rinse the plant and pick off the cottony masses. Iowa State lists both.
- Dab or spray with rubbing alcohol. Iowa State suggests a spray bottle of rubbing alcohol or a cotton swab dipped in it. UW–Madison advises testing a small area first, since damage can take a day or two to show.
- Repeat. Iowa State says multiple applications are often needed. Neem and insecticidal soap labelled for houseplants are options; apply them as the label instructs.
- Check the roots. If the aloe yellows or wilts in moist mix, slide it out of the pot. UW–Madison says root mealybugs are often confirmed only that way, and are hard to control.
Iowa State advises discarding a severely infested plant that cannot be controlled, to protect nearby succulents. An aloe that makes offsets gives you a way out: pot up a clean pup after checking it closely.
Rule out look-alikes
- Soft scale. University of Maryland Extension lists aloe as a host of brown soft scale. These are oval, tan bumps that do not move and have no cottony wax.
- Sooty mould. NC State lists sooty mould among aloe problems. It grows on the sticky honeydew that mealybugs and soft scale leave behind. Clear the insects and the mould stops spreading.
Pets
The ASPCA lists aloe as toxic to dogs, cats and horses, with vomiting, lethargy and diarrhoea as signs. Keep pets away from trimmed leaves and treated plants.
Our mealybugs guide covers mealybug biology and treatment options in depth. For more aloe care, including repotting stress, visit the aloe vera hub.
Related guides
Other aloe vera problems we cover: etiolation, harvesting gel and storage, brown tips, propagation.
References
- NC State Extension Gardener Plant Toolbox: Aloe vera
- Iowa State University Extension and Outreach: Common Problems and Issues of Succulents
- UW–Madison Extension: Mealybugs
- Colorado State University Extension: Managing Houseplant Pests
- Clemson Cooperative Extension HGIC 2252: Common Houseplant Insects & Related Pests
- Penn State Extension: Aloe, a Hardy Houseplant
- University of Maryland Extension: Scale Insects on Indoor Plants
- ASPCA Animal Poison Control: Aloe
How this guide was put together: NC State Extension, Iowa State University Extension, UW–Madison Extension, Colorado State University Extension, Clemson Cooperative Extension, Penn State Extension, University of Maryland Extension and ASPCA guidance.