Explanation of Names
celti no doubt refers to the host tree, Celtis.
These aphids are covered in a bluish white wax that forms from conspicuous abdominal glands.
The winged forms have shading along the wing veins, particularly toward the edge of the wings.
While generally obscured like most of the insect by the waxy covering, the antennae are marked with alternating black and white bands.
Known to occur in Florida, Georgia, Texas, and California. Will no doubt spread from these areas to others wherever Hackberry occurs along with a suitable climate.
On the leaves of hackberry, particularly the undersides.
Summer adults are all female who reproduce parthenogenetically. In the fall, males appear and mating occurs, producing eggs that overwinter.
Varieties of Hackberry, Celtis.
Summer adults are all winged or wingless females that reproduce parthenogenetically. In the fall, winged males appear and mating occurs, producing eggs that overwinter on tree branches.
While there are other species in the genus Shivaphis in Asia, only S. celtis is known to occur in the Western Hemisphere.
Accidently introduced in the Southeast in the late 1990's. First found in Georgia (1996), then Florida (1997), Texas and California (both 2002)
These aphids produce copious amounts of clear, sticky honeydew, that will coat anything beneath their host tree, including, to many people's chagrin, vehicles.
While the honeydew may be bothersome to people, they don't seem to pose any real threat to their host trees.
Photos and info in Cranshaw, Garden Insects of North America, page 312 (1)
The content for this guide page was mostly gathered from these two sources:
Pest Notes: Hackberry Woolly Aphid
, UC ANR Publication 74111 (PDF
Halbert, S. E., and P. M. Choate. 1999. An Asian Woolly Hackberry Aphid
, Shivaphis celti Das (Homoptera: Aphididae). Fla. Dept. Agric. & Consumer Services Ent. Circ. 392. (PDF