Aphids On Hibiscus: How To Get Rid Of Hibiscus Aphids

Sticky leaves, curled new growth, and a crowd of tiny bugs on the flower buds? Aphids have found your hibiscus.

Don’t panic. Aphids are manageable when you catch them early. UF/IFAS Extension says aphids, whiteflies and mealybugs on hibiscus are usually found in clusters on leaves and flower buds, and that if caught early they are easily controlled with insecticidal soaps or horticultural oils.

Here’s how to spot them, what damage to expect, and how to get rid of them in order, starting with the gentlest fixes.

What Aphids on Hibiscus Look Like

Aphids are small, soft-bodied, pear-shaped insects with long legs and antennae. The University of California Statewide IPM Program (UC IPM) says they may be green, yellow, brown, red or black depending on the species and the plant they feed on.

Most have a pair of tubelike structures, called cornicles, sticking out of the back end. Those cornicles set aphids apart from every other insect.

The melon aphid, also called the cotton aphid (Aphis gossypii), is one species to know. UF/IFAS lists hibiscus among the crops it injures regularly. Wingless adults are only 1 to 2 mm long (about 1/32 to 1/16 inch).

Their color varies a lot: light green mottled with dark green is most common, but whitish, yellow, pale green and dark green forms occur too. Winged adults have black heads and thoraxes. So a cluster of “black aphids” on your hibiscus may or may not be melon aphids.

Look for them on soft new growth and flower buds. UC IPM says aphids feed on soft, new plant growth and that many species prefer the undersides of leaves, so flip leaves over when you check.

Hardy and tropical hibiscus can both get them. Clemson Cooperative Extension lists aphids among the insect pests of hibiscus on a factsheet that covers both hardy hibiscus (such as Hibiscus moscheutos) and tropical Chinese hibiscus (Hibiscus rosa-sinensis).

Rose of Sharon (Hibiscus syriacus) plays its own role: UF/IFAS says catalpa and rose of Sharon were the overwintering hosts for melon aphid eggs in northern locations, while in the south overwintering eggs are not commonly produced.

What Damage Do Aphids Cause on Hibiscus?

Aphids use long, slender mouthparts to pierce tender plant parts and suck out the fluids. According to UC IPM:

• Low to moderate numbers of leaf-feeding aphids aren’t usually damaging.
• Large populations can turn leaves yellow and stunt shoots.
• Some species inject a toxin that makes leaves curl and further distorts growth.
• Aphids produce a sticky waste called honeydew, which often turns black as a sooty mold fungus grows on it.

The reassuring part: UC IPM says aphids seldom kill a mature plant, and most established plants can tolerate aphid feeding and outgrow the damage. The damage and the sticky mess are still good reasons to act.

Aphids can also spread plant viruses. UC IPM says aphids may transmit viruses from plant to plant on certain vegetable and ornamental plants, and that this is hard to prevent by controlling aphids because it takes only a few minutes for an aphid to transmit a virus.

Seeing ants marching up your hibiscus? Check for aphids. UC IPM says ants tend aphids for their honeydew and protect them from natural enemies, and UF/IFAS says ants are commonly found with melon aphids. UF/IFAS also suggests scouting by noticing sooty mold growing on the honeydew.

How To Get Rid of Aphids on Hibiscus

Work from the gentlest step up. UC IPM recommends using nonchemical methods first and, if a spray is necessary, choosing products that are less toxic to natural enemies, such as insecticidal soaps and oils.

Check Your Plants Often

UC IPM suggests checking plants at least twice a week when they are growing rapidly, so you catch aphids early enough to hose them off or prune them out. Turn the leaves over.

While you’re looking, watch for lady beetles, lacewings, syrphid fly larvae and the swollen, crusty “mummies” of parasitized aphids. Plenty of these good guys can mean the aphids will drop fast without any treatment.

Hose Them Off

On a sturdy hibiscus, a strong spray of water from the garden hose knocks aphids off the plant. UC IPM says most dislodged aphids won’t be able to return, and the spray washes off honeydew too.

Do it early in the day: UC IPM says morning water sprays let plants dry off rapidly in the sun and be less susceptible to fungal diseases. Repeat whenever you see new clusters.

Prune Out Curled Tips

If the aphids are concentrated on a few curled leaves or new shoots, UC IPM says the best control may be to prune those areas out and dispose of them. Aphids hidden inside curled leaves are protected from contact sprays anyway.

Let the Natural Enemies Work

Aphids have plenty of predators and parasites. UC IPM names lady beetles (ladybugs), lacewings, syrphid fly larvae, soldier beetles and tiny parasitic wasps as common natural enemies, and the aphid midge has larvae that feed on aphids too.

UC IPM notes that natural enemies usually don’t show up in big numbers until aphids are numerous, and that broad-spectrum pesticides kill them along with the pests. Give them a chance before you reach for a strong spray.

Buying ladybugs? UC IPM says released lady beetles may give some temporary control, but most will disperse from your yard within a few days.

Keep Ants Off the Plant

Because ants guard aphids from their natural enemies, UC IPM calls managing ants a key part of aphid control.

On a hibiscus tree or other woody plant, wrap the trunk with fabric tree wrap or duct tape and put a band of sticky material on the wrap, not directly on young or thin bark.

Ant stakes or containerized baits on the ground are another option. Prune branches that touch buildings, the ground or other plants, since ants use them as bridges.

Go Easy on Nitrogen

UC IPM says high levels of nitrogen fertilizer favor aphid reproduction. Use no more nitrogen than your hibiscus needs, and choose a slow-release fertilizer applied in small portions rather than one big dose.

Insecticidal Soap or Horticultural Oil

When hosing and patience aren’t enough, these are the go-to insect sprays for hibiscus. UF/IFAS recommends insecticidal soaps or horticultural oils for hibiscus aphids caught early, and UC IPM calls soaps and oils the best choices for most situations.

Neem oil counts as a plant-derived oil here; the University of Minnesota Extension says neem discourages aphid feeding, so aphids aren’t killed quickly but stop feeding and slowly die.

Coverage is everything. UC IPM says these products kill mainly by smothering, so you need to wet the undersides of the leaves as well as the tops.

They kill only the aphids present on the day you spray, so you may need repeat applications. On the plus side, they leave no toxic residue, so they don’t kill natural enemies that move in after the spray.

Protect the plant while you protect it from bugs. UC IPM says not to use soaps or oils on water-stressed plants or when temperatures are above 90°F. Clemson adds: don’t spray in direct sunlight, and apply early in the morning or late in the evening.

Clemson’s insecticidal soap factsheet suggests testing for plant sensitivity by spraying a small area and waiting 24 hours to see if any damage shows up. UC IPM goes further: check labels and test the product on a portion of the foliage several days before a full treatment.

Related: Spraying For Aphids: What Is The Best Time?

Buy a commercial product and follow its label. Clemson says homemade soap recipes are not recommended because they are more likely to injure plants.

UC IPM’s statement on homemade pesticides says kitchen mixes (dish soap, garlic, cooking oils and the like) generally haven’t been studied in replicated research trials, and their effects on natural enemies, pollinators and people haven’t been proven safe.

Pyrethrins: Stronger, With Trade-Offs

Pyrethrins are botanical insecticides from the flowers of a type of daisy. Clemson says they are contact insecticides that rapidly paralyze insects but may not kill them, so they are often combined with another insecticide.

Clemson also says pyrethrins are highly toxic to many beneficial insects, although the activity usually lasts only a few hours. The National Pesticide Information Center (NPIC) says pyrethrins are highly toxic to honey bees and highly to very highly toxic to fish.

UC IPM says soap-plus-pyrethrin products may give slightly more knockdown than soap alone, with fewer harmful effects on natural enemies than malathion, permethrin and acephate, because pyrethrins break down very quickly.

Don’t confuse pyrethrins with pyrethroids: Clemson describes pyrethroids as synthetic, generally stronger and longer-lasting on plants. Use only a labeled product, exactly as the label directs.

Diatomaceous Earth: A Minor Option

Clemson lists soft-bodied insects like aphids among the pests diatomaceous earth (DE) controls. NPIC says DE works by drying insects out and stays effective only as long as it is kept dry and undisturbed, so rain, dew or the hose undoes it.

Clemson says to use natural-grade DE, not the type sold for pool filters, that it may irritate lungs if inhaled during application, and that it can also harm honeybees, so avoid applying it to plants in flower. More on how it works: diatomaceous earth for potted plants.

Never Use Malathion on Hibiscus

UF/IFAS is blunt about this one: read labels carefully, because you should never use the pesticide malathion on hibiscus.

More broadly, UC IPM says longer-lasting sprays such as malathion, permethrin and acephate also kill the natural enemies that provide long-term aphid control and are associated with bee kills.

The University of Minnesota Extension adds that these residual products can worsen aphid problems and that you should not spray blooming trees or shrubs.

Systemic Insecticides (Imidacloprid): Last Resort, Never in Bloom

Systemic insecticides such as imidacloprid are taken up by the plant and kill aphids as they feed. UC IPM says they are very effective but can harm predators, parasitoids and pollinators, so avoid them where soaps and oils give adequate control.

To protect pollinators, UC IPM says don’t apply imidacloprid or other systemic insecticides to plants in bloom or prior to bloom. The University of Minnesota Extension says imidacloprid and dinotefuran are very toxic to pollinators and can take two to four weeks to work.

Keep hibiscus bloom habits in mind. Clemson says hibiscus are highly attractive to butterflies and hummingbirds, and UF/IFAS says tropical hibiscus blooms over a long season, nearly year-round in South Florida.

UC IPM’s quick tips also note that, as of January 2025, systemic products for aphids are available only to licensed pest control professionals (UC IPM is California’s program; check the rules where you live). Whatever you use, the label is the final word on whether it can go on hibiscus.

How To Keep Aphids From Coming Back

• Check new growth and buds at least twice a week while your hibiscus is growing fast (UC IPM).
• Inspect new plants and remove any aphids before planting; UC IPM recommends checking transplants.
• Feed lightly with slow-release fertilizer instead of heavy nitrogen doses (UC IPM).
• Protect the good bugs by skipping broad-spectrum sprays (UC IPM, University of Minnesota Extension).
• Keep ants off woody hibiscus with a sticky band on a trunk wrap, or use ant baits (UC IPM).

Weather helps too. UC IPM says many aphid species do the most damage in late spring, when temperatures are warm but not hot (65 to 80°F), and that some aphids are heat-intolerant and gone by mid-summer. That’s written for California, so watch your own plants: if aphids return each spring, start your twice-a-week checks early.

Fighting aphids on other plants too? See our guide to aphids on roses.

Got aphids on your hibiscus right now? Start with the hose, then tell us how it went in the comments.