Ants 🐛
Family formicidae
At a glance
- Looks like: Ant trails running up stems, pots, trunks, or nearby hardscape
- Tell-tale sign: Ants clustering around aphids, scale, mealybugs, or whiteflies
- Severity: Indirect — often the bodyguards protecting the real pest
How to identify
Ants on plants are often a clue, not the primary problem. Follow the trail. If ants are visiting stems, leaf undersides, or new growth, look for honeydew insects: Aphids, Whiteflies, Mealybugs, or Scale Insects. Ants harvest the sugar and protect those pests from predators.
Damage
Most ants do not chew the plant itself, but they can make sap-sucking pest outbreaks worse by defending the colony from lady beetles, lacewings, and parasitoids. In pots, nesting can disturb soil; indoors, ants are also a nuisance.
Treatment (least-toxic first)
Following Integrated Pest Management:
- Find the honeydew source before treating the ant trail.
- Control the sap-sucking pest with rinsing, pruning, soap/oil, or other targeted steps.
- Use ant baits rather than sprays when ant control is needed; sprays scatter colonies and can harm beneficials.
- Block access on trunks or benches where appropriate, especially for outdoor container plants.
Prevention
Monitor sticky residue and ant trails early. Outdoors, reduce honeydew pests and avoid broad insecticides that kill natural enemies.
Affects (in this guide)
Plants with Aphids, Whiteflies, Mealybugs, or Scale Insects; outdoor pots and landscape plants