If your neighborhood has Chinese hackberry trees, chances are you've noticed a sticky substance on cars, parking lots and sidewalks. The sticky substance is called honeydew, and might be caused by a pest called the hackberry woolly aphid.
Hackberry woolly aphids appear as fuzzy, bluish white masses on leaves and other tree parts and are about 1/10 of an inch or less in diameter. Not all the aphids have wings, but those that do have distinct black borders along the forewing veins and their antennae have alternating dark and light bands. As the aphids suck out plant juices, they excrete the sticky honeydew. Sometimes blackish sooty mold grows on the honeydew and creates a sticky mess on leaves and surfaces beneath infested...
The hackberry woolly aphid (Shivaphis celti), sometimes called Asian woolly hackberry aphid, infests the widely planted Chinese hackberry (Celtis sinensis) and other Celtis species. Often, the first observed sign of a hackberry woolly aphid infestation is the sticky honeydew it produces, upon which blackish sooty mold grows, creating a sticky mess on leaves and surfaces beneath infested trees.
These aphids also secrete pale wax, which covers their bodies. Woolly aphids on shoot terminals and leaves appear as fuzzy, bluish or white masses, each about 1/10 inch or less in diameter. Winged forms have distinct black borders along the forewing veins and their antennae have alternating dark and light...