Published on: October 21, 2015
![Sticky honeydew and whitish hackberry aphids on hackberry leaves. [J.K.Clark]](https://ucanr.edu/blogs/UCIPMurbanpests/blogfiles/32788small.jpg)
Sticky honeydew and whitish hackberry aphids on hackberry leaves. [J.K.Clark]
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...
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