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How to identify it
- Adults are wingless, oval and slightly convex, shiny dark brown with a fringe of white wax plates around the edge, and 1 to 2 mm long.[1]
- Every stage has a pair of tiny spikes, or horns, on the front of the head.[1][3]
- Nymphs are smaller (up to 1 mm), light green to olive, with the same white waxy fringe and visible body segments.[1]
- Colonies sit on the unopened frond and the youngest two or three fronds, sometimes on young fruit, and the aphids stay put for long periods while they feed. Ants often tend them.[1][3]
Look-alikes
| Look-alike | How to tell them apart |
|---|---|
| Whitefly pupae | Adult palm aphids are commonly mistaken for whitefly pupae. Look for the two small horns on the head and the segmented abdomen; the aphids also have working legs and crawl slowly away if disturbed.[1][3] |
| Other Cerataphis aphids (C. lataniae and the orchid aphid, C. orchidearum) | These close relatives are commonly confused with the palm aphid. The palm aphid is separated by small dagger-like bristles under the head, but the trait varies so much that some taxonomists doubt the two palm-feeding species are really distinct.[1] |
| Tessellated scale | This soft scale also lives on palms, and in Miami the two have infested the same coconut palms. Tessellated scale is a flat, reddish to dark brown scale 2 to 5 mm long with a mosaic of plates on its back and no wax cover.[4][1] |
Where it lives
Native to Southeast Asia, the palm aphid now occurs throughout the world's tropics, outdoors and in greenhouses, probably spread with the trade in living palms from the early 1900s. In the United States it is common in southern Florida but rare north of Lake Okeechobee.[1][2]
Biology and life cycle
In its native range it alternates between a tree, Styrax benzoin, where colonies live inside hard galls, and palms, where they feed in the open. Where that tree is absent, as in Florida, the aphid lives on palms alone, reproduces without mating, and goes through several generations a year, with the largest populations in warm months.[1][3]
It feeds only on palms, although it has been recorded on banana. It prefers the 'Malayan Dwarf' coconut palm and also infests date palm, Chinese fan palm, Alexander palm and Washington palm, and it is particularly important on coconut and oil palm.[1][2]
Ants protect the colonies in exchange for the honeydew the aphids excrete, and an aphid can flick a honeydew droplet up to half an inch.[1][3]
Palm aphids fight over feeding spots: in lab observations two aphids butted each other with their horns for up to 19 minutes, trading blows about 40 times a minute.[3]
Damage and signs
- Feeding on the phloem yellows the leaf tissue and saps the palm's vigor, and heavily infested palms can be stunted. The damage can be substantial on young coconut palms and occasionally severe in nurseries and landscapes.[1]
- The honeydew grows sooty mold on the fronds, which cuts down photosynthesis.[1]
- It has not been linked to spreading any plant virus.[2]
Health risk
The sources treat it only as a plant pest; none mentions bites or other risk to people or pets.[1][2]
Control
Prevention
Check newly bought palms for aphids before planting them; keeping the aphid out of the landscape is the first line of defense against damaging outbreaks.[1]
Traps and physical control
Scout palms monthly for the aphids and for their natural enemies, and treat sooty mold on the fronds as a sign that aphids may be present.[1]
Biological control
Because the aphids barely move, natural enemies work well: syrphid fly and lady beetle larvae commonly eat palm aphids and can be released against infestations.[1][3]
Pesticides
If aphid numbers are high and natural enemies are scarce, horticultural oil can be applied. Professional palm growers may need an insecticide, though the most effective one hasn't been determined; pyrethroids kill natural enemies and should be a last resort.[1]
Common questions
- Is it a whitefly, a scale or an aphid on my palm?
- A small, flat, oval insect that is shiny dark brown with a white waxy rim, sitting on the newest fronds, is likely the palm aphid. Under a hand lens it shows two tiny horns on the front of the head and a segmented abdomen.[1]
- Why are ants crawling over my palm fronds?
- Ants tend palm aphids and protect them in exchange for their honeydew, so ant traffic on new fronds can point to an aphid colony.[1][3]
- Do palm aphids spread plant diseases?
- They haven't been implicated in transmitting any plant virus. The harm comes from sap feeding and from the sooty mold that grows on their honeydew.[2][1]
Sources
- University of Florida IFAS Extension (EDIS Featured Creatures), “Palm Aphid, Cerataphis brasiliensis (Hempel) (EENY-520, 2012).” journals.flvc.org/edis/article/view/119703 (accessed 2026-11-09)
- USDA APHIS PPQ Identification Technology Program (AphID), “AphID: Cerataphis brasiliensis.” www.aphid.aphidnet.org/Cerataphis_brasiliensis.php (accessed 2026-11-09)
- Florida Entomological Society (Florida Entomologist), “Intraspecific dueling in palm aphids, Cerataphis brasiliensis (Howard, Halbert and Giblin-Davis 1998, Florida Entomologist 81: 552-554).” journals.flvc.org/flaent/article/view/59411 (accessed 2026-11-09)
- University of Florida IFAS Extension (EDIS Featured Creatures), “Tessellated Scale, Eucalymnatus tessellatus (Signoret) (EENY 456, 2009).” journals.flvc.org/edis/article/view/118268 (accessed 2026-11-09)
- iNaturalist, “Cerataphis brasiliensis taxon page (order and family).” www.inaturalist.org/taxa/656055 (accessed 2026-11-09)