The Most Common Tree Pests in Miami (and How to Treat Them)
The tree pests in Miami that cause the most damage are rugose spiraling whitefly, ficus whitefly, royal palm bug, scale insects, and wood-boring beetles.
Each one hits a different set of trees, and each one needs a different fix.
Spraying the wrong thing at the wrong time usually makes the problem last longer. Here is how to tell them apart.
1. Rugose Spiraling Whitefly: The Messy One
Rugose spiraling whitefly covers leaves in white wax and coats everything below in sticky honeydew, which then turns black with sooty mold.
It showed up in South Florida in 2009 and has since been found in 17 counties.
In Miami, it favors gumbo limbo, coconut palms, black olive, avocado, and giant white bird of paradise.
You will see white spiral patterns on the undersides of leaves.
Here is the part most homeowners get wrong. UF/IFAS advises against spraying the foliage because the spray also kills the predators and tiny parasitic wasps that naturally knock the whitefly down.
A wasp called Encarsia noyesi has driven past outbreaks in Miami-Dade back down on its own.
What to do instead:
- Wash the foliage with soap and water to reduce populations.
- Keep the tree watered and fertilized properly so it handles the feeding stress.
- Bag any pruned material or dropped fronds and haul them to a landfill so you don’t spread the pest to the next yard.
- Use soil-applied systemic products only when the infestation is severe, and only at label rates.
2. Ficus Whitefly: The One That Kills
Ficus whitefly is smaller, quieter, and far more destructive.
It was first found in the United States right here in Miami-Dade in 2007 and went on to kill miles of Ficus benjamina hedge across South Florida.
It produces little honeydew, so you will not get the sooty mold mess. That is the fastest way to tell it apart from the spiraling whitefly.
What you get instead is yellow streaking on the leaves, then heavy leaf drop, then branch dieback. Untreated hedges can die outright.
Timing matters more here than with any other pest on this list.
The population takes several generations to build, so a hedge checked monthly is far easier to save than one noticed after it has gone bare.
If you have a benjamina hedge, flip a few leaves once a month and look for flat, translucent nymphs with red eyes.
The Entomological Society of America published a field identification guide worth bookmarking.
3. Royal Palm Bug: Spring Damage on Royal Palms Only
Royal palm bug feeds on one tree and one tree only: the Cuban royal palm. If your palm isn’t a royal, this isn’t your problem.
The insect is tiny, about one tenth of an inch, pale yellow-green with red eyes. Damage starts as small yellow spots on newly opened leaflets.
Older leaflets develop brown streaks, and badly hit palms push out ragged, tan-gray new growth.
Damage peaks in spring and early summer, then drops off until the following spring. That seasonal pattern is useful. You do not need to treat preventively.
UF/IFAS research found soil-applied systemic products provided strong control at 30 and 75 days after treatment, so you can wait for visible damage and treat only the palms that have it.
The UF/IFAS royal palm bug fact sheet covers identification in detail.
If you are unsure which palms you have, our guide to native and non-native palms helps sort them out.
4. Scale Insects and Sooty Mold
Scale insects look like bumps, not bugs. They sit still on stems and leaf undersides and feed through the bark.
Soft scales excrete honeydew, so the first sign is usually the black sooty mold growing on it, not the insect itself.
Scratch a suspect bump with a fingernail. If it pops off and leaves a wet spot, it is scale.
Sooty mold itself does not infect the tree. It blocks light and looks awful, but it clears once the insect feeding stops.
The same confusion comes up with Spanish moss, which also gets blamed for damage it did not cause.
Treatment depends on whether the scale is soft or armored, and horticultural oil timing has to match the crawler stage.
5. Boring Beetles and the Trees They Kill
Boring beetles are the most serious group because the damage happens inside the trunk where you cannot see it.
By the time the canopy thins, the tree is often past saving.
The redbay ambrosia beetle is the one Miami property owners should know, because it carries the fungus behind laurel wilt disease, which kills avocado, redbay, and swamp bay trees.
Look for tiny round exit holes, thin toothpick-shaped sawdust tubes, and wilting that spreads through one limb at a time.
No home remedy can treat an active borer infestation.
Reading the Tree Before You Treat Anything
Many pest calls turn out to be stress, not insects.
A tree drowning in poor drainage, cut too hard, or planted too deep can show the same yellowing and thinning that pests cause.
Work through the signs of a diseased or dying tree before you buy a product, and rule out the dangerous tree diseases that mimic pest damage.
Pesticides are regulated. Follow label directions exactly, and use a licensed applicator for anything applied to the soil or injected into the trunk.
Book the Inspection Before the Canopy Thins
Whiteflies and scale are fixable.
Borers usually are not, and the difference between the two is how early someone looked.
If your tree is dropping leaves out of season, or you see sticky residue on the driveway under it, get eyes on it now.
We cover the full service range in our complete guide to tree service in Miami, and infested material should be removed properly, which is where professional tree trimming in Miami keeps the problem from spreading down the block.