Devil’s Ivy Pests: Mealybugs, Spider Mites and Fungus Gnats (Australian Guide)

11 July 2026

Devil’s Ivy is not a magnet for pests, which is part of why we all recommend it. But when something does turn up, it is almost always one of three culprits — and each one is telling you something different about how you are keeping the plant.

💡

Quick take: Mealybugs look like tiny white cotton fluff in the leaf joints. Spider mites cause fine stippling and webbing, and love hot dry air. Fungus gnats are little black flies around the soil and mean you are overwatering. Quarantine every new plant for about three weeks — that is where infestations usually come from.

🐛 The Three You Will Actually See

Pest	What you see	What it means
Mealybugs	White cottony fluff where leaf meets stem; sticky honeydew	Usually arrived on a new plant
Spider mites	Fine pale speckling; delicate webbing under leaves	Air is hot and dry — often near heating or a sunny window
Fungus gnats	Small black flies rising from the mix	You are overwatering. The mix never dries out

🤍 Mealybugs

The most common pothos pest, and the most satisfying to deal with. They hide in the leaf axils and along the stems.

🧾 How to treat

Isolate the plant from your others immediately.
Dip a cotton bud in rubbing alcohol and touch each mealybug and cottony egg sac directly — they die on contact.
For a wider spread, wipe the leaves and stems over, then treat with horticultural oil or an appropriate insecticidal soap, following the label.
Check again every few days for two to three weeks — eggs hatch in waves.
Inspect the leaf joints and the underside of every leaf. That is where they hide.

🕸️ Spider Mites

Tiny, hard to see, and they multiply fast in hot dry air — which describes most Australian living rooms with the air-con running, or any plant sitting too close to a heater.

Look on the undersides of the leaves for fine webbing and a dusty, stippled look on the leaf surface. Increasing humidity around the plant and rinsing the foliage under the shower knocks populations back; for a real infestation, horticultural oil applied thoroughly to the leaf undersides is the practical option.

🦟 Fungus Gnats

⚠️

Fungus gnats are not really a pest problem — they are a watering problem. They breed in permanently damp topsoil. Spraying the adults achieves almost nothing while the mix stays wet.

🧾 How to actually get rid of them

Let the top few centimetres of mix dry out properly between waterings. This breaks the breeding cycle.
Yellow sticky traps catch the flying adults and let you track whether numbers are dropping.
For a persistent case, a soil drench containing Bacillus thuringiensis israelensis (Bti) targets the larvae.
Check the plant is not sitting in a cover pot full of water.

🛡️ Prevention

Nearly every infestation walks in the front door on a new plant. Keep anything new away from your other plants for about three weeks, and inspect it properly at the end of that — including the leaf undersides and the joints. It is a dull habit that saves an enormous amount of trouble.

❓ Frequently Asked Questions

❓ Can I just spray the plant with soapy water?

A mild insecticidal soap can help for light infestations, but coverage matters more than the product — pests hide under leaves and in the joints, and anything you miss simply repopulates. Household detergent is not the same thing and can damage foliage.

❓ Do I need to throw the plant out?

Almost never. Devil’s Ivy is tough, and even a badly infested plant can usually be cut back hard, cleaned up and propagated from healthy stem sections.

❓ Are the gnats hurting my plant?

The adults are mostly an annoyance. The larvae can nibble fine roots, but the bigger issue is what their presence tells you: the mix is staying too wet, which is the road to root rot.

❓ Is neem oil safe on Devil’s Ivy?

It is commonly used, but always follow the product label, test on one leaf first, and never apply it to a plant sitting in direct sun — that combination can burn the foliage.