Whiteflies in South Florida: Signs of Infestation and What They Mean

Q: What do whitefly eggs look like?

They are tiny and laid on the undersides of leaves. Most whitefly eggs are hard to see without a hand lens. The exception is the rugose spiraling whitefly, which lays its eggs in loops covered with white wax, so the spirals are easy to spot. FDACS notes that spirals are often seen on leaves with no nymphs present yet, an early warning that adults are laying eggs.

Q: Are the white flies on my plants always whiteflies?

Not always, so look closely. Whiteflies are tiny, white-winged insects that rise in a cloud when you brush the plant and settle again quickly. Mealybugs and some scale insects also leave white, cottony or waxy material, and a white powdery coating on leaves can be powdery mildew, a fungus. Checking the leaf undersides with a hand lens, or having a professional identify a sample, avoids treating the wrong problem.

Q: Can whiteflies kill a plant?

Large, healthy plants usually survive. UF/IFAS notes that established trees, shrubs and palms generally recover, while young, newly planted or stressed plants are at greater risk. Ficus whitefly is the exception people remember: it can severely defoliate ficus hedges, and badly affected hedges can suffer branch dieback. Our guide to dealing with whiteflies explains when treatment makes sense.

Q: Is there a season for whiteflies in South Florida?

Whiteflies can be found year-round here. UF/IFAS reports that whiteflies develop from egg to adult in about 4 weeks in summer but can take up to 6 months in winter, so populations build fastest in the warm months. In South Florida, where winters are short and mild, it pays to check susceptible plants such as ficus, palms and gumbo limbo every few weeks from spring through fall.

Q: Should I cut back a hedge that has whiteflies?

Usually not. UF/IFAS says you do not need to prune or remove an infested tree, and that in the vast majority of cases it will survive. If a plant does need pruning for other reasons, UF/IFAS suggests removing those branches before any insecticide is applied and following good pruning practices. Keeping the plant well watered and fertilized helps it recover.

Key takeaways

The most reliable signs are under the leaves: flat, oval nymphs, empty pupal cases and silvery shed skins. Ficus whitefly adults live only 2 to 4 days, so they are a poor indicator.
White waxy spirals on leaves, walls or cars point to the rugose spiraling whitefly, found in Florida since 2009.
Ficus hedges that yellow and drop leaves may have had ficus whitefly for months before the damage shows.
Sooty mold is a fungus growing on whitefly honeydew, not a plant disease, and it usually fades once the whiteflies are controlled.

In this article

What Whiteflies Are and Why South Florida Has So Many
The 5 Main Signs of a Whitefly Infestation
Signs at a Glance: What Each One Means
Look-Alikes: What Is Not a Whitefly
What to Do When You Find the Signs
When to Call a Professional
Frequently Asked Questions

The clearest signs of whiteflies are a cloud of tiny white insects when you brush a plant, yellowing or falling leaves, sticky honeydew and black sooty mold. The proof, though, is under the leaves, where the immature stages feed without moving.

Whiteflies are easy to miss early. According to UF/IFAS, infestations often go unnoticed until leaves turn yellow or drop, or until someone shakes a plant and a cloud of adults flies up. By then, the population has usually been growing for several generations. This guide shows you what each sign means, how to check your plants in a few minutes and which whitefly you are probably dealing with in South Florida.

Whitefly on a leaf vein with tiny eggs laid in a spiral pattern, a telltale sign of infestation.

What Whiteflies Are and Why South Florida Has So Many

Whiteflies are not true flies. They are small sap-feeding insects related to aphids, mealybugs and scales. Adults have white, waxy wings and live only a short time; the damage comes mostly from the flat, oval nymphs that stay fixed to the underside of a leaf and feed through needle-like mouthparts.

Florida has many whitefly species, and UF/IFAS notes that new invasive pests keep arriving. Development from egg to adult takes about 4 weeks in summer and up to 6 months in winter, so South Florida’s long warm season lets populations stack one generation on top of another. Our article on why whiteflies spread so fast in South Florida explains that growth in detail.

The Whiteflies You Are Most Likely to Find

Whitefly	Main plants	What to look for
Ficus whitefly	Ficus only, especially weeping fig (Ficus benjamina) hedges	Gnat-sized adults with yellow bodies and white wings with a faint gray band; yellowing leaves, then heavy leaf drop
Rugose spiraling whitefly	Gumbo limbo, coconut and other palms, avocado, black olive, Calophyllum and many more	Spirals of eggs covered in white wax; fluffy white wax and lots of honeydew
Bondar’s nesting whitefly	Ornamental landscape plants	Nymphs surrounded by wax “nests” under the leaves
Silverleaf and other common whiteflies	Vegetables, annuals and many ornamentals	Clouds of small white adults; sticky leaves and sooty mold

Toro’s whitefly pest library page has photos of these species if you want to compare.

The 5 Main Signs of a Whitefly Infestation

Check for these in order, from the easiest to notice to the most conclusive.

Sign 1: A Cloud of Tiny White Insects

Brush or shake the plant and watch. Whitefly adults rise in a small cloud and then settle back on the leaves within seconds. FDACS describes rugose spiraling whitefly adults rising “in clouds” from infested foliage.

Seeing adults confirms whiteflies are present, but it does not tell you how bad the problem is. Ficus whitefly adults live only 2 to 4 days, according to Palm Beach County Extension, so the number you see flying says little about the size of the infestation. Always check the nymphs too.

Sign 2: Nymphs, Pupal Cases and Silvery Spots Under the Leaves

Turn over several leaves from different parts of the plant, especially the inner and lower foliage. Look for:

Nymphs: tiny, flat, oval scales that do not move. Ficus whitefly nymphs are tan to light green with red eyes, according to UF/IFAS Monroe County Extension.
Pupal cases: the last immature stage, often the easiest to see. Empty cases with a slit show that adults have already emerged.
Silvery spots: shed skins left on the underside of the leaf.
Parasitized nymphs: UF/IFAS notes that a parasitized nymph contains the larva or pupa of a tiny parasitic wasp, and a small round emergence hole may be visible once the wasp leaves, a good sign that natural enemies are working.

A 10x hand lens makes this much easier. Extension entomologists recommend scouting for these immature stages rather than relying on the adults you see flying.

Toro tip: Check the same three or four plants every two weeks during the warm months, flipping five leaves on each. Note whether you see live nymphs or only old, empty cases. That simple record tells you, and your technician, whether the infestation is growing or fading.

Sign 3: Yellowing, Wilting and Falling Leaves

As whiteflies drain sap, leaves turn yellow, wilt and eventually drop. Branches may also die back, although Palm Beach County Extension notes that dieback is highly variable from plant to plant.

Timing matters. Ficus can drop leaves for many reasons, including drought and transplant stress, but UF/IFAS notes that ficus whitefly causes leaf drop only after several months of infestation. A hedge that is suddenly thin has usually been infested for a while. For the full story on hedges, read why whiteflies are destroying ficus hedges across Florida.

Sign 4: Sticky Honeydew and Black Sooty Mold

Whiteflies excrete honeydew, a clear, sticky liquid. You may feel it on leaves or find it as a shiny film on cars, patio furniture and pavers under infested trees.

Sooty mold, a black fungus, grows on that honeydew. UF/IFAS stresses that it is not a plant disease, but heavy coverage blocks light and can reduce photosynthesis, growth and leaf retention. It usually weathers away once the insects are controlled. If your hedge or palms are turning black, our article on the whitefly sooty mold problem covers cleanup and recovery.

Ants are another clue. They feed on honeydew, so ant trails running up a tree or hedge often lead to sap-feeding insects such as whiteflies.

Sign 5: White Waxy Spirals and Fluffy Wax

The rugose spiraling whitefly was first collected in Florida from gumbo limbo in Miami-Dade County in March 2009, according to FDACS. Females lay eggs in spiral patterns covered with white wax, and the nymphs produce dense, cottony wax. FDACS notes that when populations are high, females lay eggs on almost any surface, so spirals can turn up on things other than leaves.

UF/IFAS describes this wax as harmless to plants and animals, and it fades quickly once the whiteflies are under control. It is still the easiest whitefly sign to recognize from a distance.

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Signs at a Glance: What Each One Means

What you see	What it usually means	What to do next
Cloud of white insects when you brush the plant	Adult whiteflies present	Check leaf undersides for nymphs
Flat ovals, pupal cases, silvery spots under leaves	Active breeding infestation	Identify the species before treating
Yellowing and dropping ficus leaves	Ficus whitefly present for months	Get an inspection promptly
Sticky film on leaves, car or patio	Honeydew from sap feeders	Wash surfaces; find the source plant
Black coating on leaves	Sooty mold growing on honeydew	Control the insects; mold fades later
White waxy spirals	Rugose spiraling whitefly eggs	Check palms and nearby trees
Nymphs or cases with a small round exit hole	Parasitized whiteflies	Avoid broad sprays that kill natural enemies

Look-Alikes: What Is Not a Whitefly

Several problems are mistaken for whiteflies:

Powdery mildew is a white, dusty fungus on the leaf surface. Palm Beach County Extension specifically notes that it is not whitefly.
Mealybugs are soft, cottony insects that cluster in leaf joints and on stems, and they move slowly.
Scale insects also produce honeydew and sooty mold but stay fixed under waxy or hard covers.
Drought or transplant stress can make ficus drop leaves with no insects present.

Because treatments differ, UF/IFAS advises confirming the insect’s identity before you act.

What to Do When You Find the Signs

Start with steps that do not make the problem worse:

Confirm and identify. Look for live nymphs, not just adults or old wax.
Keep plants healthy. UF/IFAS notes that proper watering and fertilizing reduce plant stress.
Skip heavy pruning. UF/IFAS says infested trees do not need to be pruned or removed, and most survive.
Try soft options on small plants. For small infestations, Palm Beach County Extension lists washing the plants with water, insecticidal soap or horticultural oil, applied thoroughly to the leaf undersides and repeated, with every product used according to its label.
Protect natural enemies. Broad foliar sprays kill the beetles, lacewings and parasitic wasps that help keep whiteflies down.

Safety note: Read and follow every pesticide label, including where and how a product may be used and how long people and pets should stay away. Homeowners may apply non-restricted-use products to plants on their own property, but for HOA common areas, rights-of-way and commercial properties, UF/IFAS says the property owner needs to hire a pest control company.

When to Call a Professional

Call for an inspection when a ficus hedge is thinning, when palms or large trees are dripping honeydew, when the problem returns after you treat it, or when you are not sure what you are seeing. Large trees and long hedges are hard to treat thoroughly from the ground, and the right approach depends on the species.

Toro’s whitefly control service starts with a free inspection of your ficus hedges, palms and trees, including the underside of the leaves, to identify which whitefly you have and how heavy the infestation is. You get a clear plan and a quote before any work begins, then treatment of the infested plants and checks for new activity. Toro has protected South Florida landscapes since 1969, and if the bugs come back, so will Toro, at no additional cost to you. To see what happens when signs are ignored, read why ignoring whiteflies can cost you more.

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Frequently Asked Questions

What do whitefly eggs look like?

They are tiny and laid on the undersides of leaves. Most whitefly eggs are hard to see without a hand lens. The exception is the rugose spiraling whitefly, which lays its eggs in loops covered with white wax, so the spirals are easy to spot. FDACS notes that spirals are often seen on leaves with no nymphs present yet, an early warning that adults are laying eggs.

Are the white flies on my plants always whiteflies?

Not always, so look closely. Whiteflies are tiny, white-winged insects that rise in a cloud when you brush the plant and settle again quickly. Mealybugs and some scale insects also leave white, cottony or waxy material, and a white powdery coating on leaves can be powdery mildew, a fungus. Checking the leaf undersides with a hand lens, or having a professional identify a sample, avoids treating the wrong problem.

Can whiteflies kill a plant?

Large, healthy plants usually survive. UF/IFAS notes that established trees, shrubs and palms generally recover, while young, newly planted or stressed plants are at greater risk. Ficus whitefly is the exception people remember: it can severely defoliate ficus hedges, and badly affected hedges can suffer branch dieback. Our guide to dealing with whiteflies explains when treatment makes sense.

Is there a season for whiteflies in South Florida?

Whiteflies can be found year-round here. UF/IFAS reports that whiteflies develop from egg to adult in about 4 weeks in summer but can take up to 6 months in winter, so populations build fastest in the warm months. In South Florida, where winters are short and mild, it pays to check susceptible plants such as ficus, palms and gumbo limbo every few weeks from spring through fall.

Should I cut back a hedge that has whiteflies?

Usually not. UF/IFAS says you do not need to prune or remove an infested tree, and that in the vast majority of cases it will survive. If a plant does need pruning for other reasons, UF/IFAS suggests removing those branches before any insecticide is applied and following good pruning practices. Keeping the plant well watered and fertilized helps it recover.

Sources

Take a Good Look at Your Ficus Hedge, UF/IFAS Extension Monroe County
Whiteflies on Landscape Ornamentals (ENY-317), UF/IFAS Extension
The Rugose Spiraling Whitefly, Aleurodicus rugioperculatus Martin, a New Exotic Whitefly in South Florida (Hemiptera: Aleyrodidae), Florida Department of Agriculture and Consumer Services, Division of Plant Industry
Frequently Asked Questions (FAQs), UF/IFAS Entomology and Nematology Department
Whitefly in the Landscape, UF/IFAS Extension Palm Beach County

Educational content. This article is for general information about pests in South Florida and is not medical, legal or professional advice. If you have a bite, sting or allergic reaction, contact your doctor; in an emergency, call 911. Pest problems vary from home to home, so a licensed professional should inspect before treatment. When using any pesticide, always read and follow the product label.