A bug dressed like a cotton ball is already a lot to process. Finding out that more than one kind of bug has committed to this look feels excessive.
Planthoppers really do produce that ridiculous white fluff. The useful detail is which stage of the insect you are looking at. A wax-covered nymph on a stem and a fuzzy adult flying through the air are not interchangeable descriptions.
What is a woolly planthopper?
The fuzzy garden insects discussed here are flatid planthoppers, from the family Flatidae. “Woolly” describes the appearance; it does not identify one particular species.
University of Maryland Extension explains that their nymphs produce white waxy material. It can cover the insect and collect on the stems where the nymphs feed. These insects feed on plant juices and also produce honeydew.
So that little patch of fluff may have legs. The wax can remain on a stem, too, which means not every white patch is an insect currently sitting there.
The nymph matters: hopping is different from flying
UMass Extension’s photographed guide distinguishes the cottony nymphs from adults, which hold broad wings over the sides of their bodies like a tent. Adults may be green, purplish blue or powdery white.
For one example, NC State describes snowy planthopper nymphs jumping several inches when disturbed. The movement is a useful clue, although it is not enough by itself to name a species.
For identification, compare your sighting with the labeled nymph and adult photographs in those university guides. The fluffy silhouette is only the beginning.
Why is the white coating wax instead of fur?
Mississippi State Extension explains that the waxy material repels water and helps protect flatid nymphs from predators. It can get in the way of predatory insects and spiders moving toward them.
That is a better explanation than assuming the bug is simply trying to pass as a dandelion seed. The cotton-ball effect is excellent. The insect does not need a tiny costume department to achieve it.
What if the white fluff is actually flying?
Keep woolly aphids on the list of possibilities. Iowa State describes winged woolly alder aphids with white wax on their bodies that look like little cottony tufts moving through the air. Those adults fly; they are not just pieces of wax carried away from a branch.
That does not make every flying white bug a woolly aphid, either. A description such as “tiny, white and fluffy” leaves several possibilities open.
What to do if you find one in the garden
Start by looking, not spraying. For the common ornamental-plant planthoppers it describes, Maryland Extension reports little damage and says control is unnecessary. That guidance is not a promise about every insect called a planthopper.
If you want help identifying yours, take a clear close-up, note the plant and your location, and record whether the insect crawls, jumps or flies. If the plant is declining, include a photograph of the whole plant when you ask your local extension office for advice.
TTB’s earlier flatid planthopper photo roundup captures the original “that cannot possibly be a bug” reaction. The life-stage distinction is what makes the fluff a little less mysterious.
Still a very strange outfit for an insect. Just worth checking who is wearing it.
Frequently asked questions
What is a woolly planthopper?
The cottony material associated with flatid planthoppers is wax produced by the immature insects, called nymphs. White fluff alone is not enough to identify a species.
Can that flying cotton ball be a woolly aphid instead?
Yes. Iowa State describes winged woolly alder aphids that look like tiny cottony tufts in flight. A flying white puff is not automatically a planthopper.
Why are planthopper nymphs covered in white fluff?
Their covering is wax, not fur. Mississippi State explains that the wax repels water and can help protect the nymphs from predators.
Do garden planthoppers need treatment?
The common ornamental-plant planthoppers described by University of Maryland Extension usually cause little damage and do not need control. If a plant is declining or the insect is uncertain, get a local identification before choosing treatment.
