Hackberry Leaf Drop; In the past few weeks the Plant Clinic has received several calls about hackberry trees dropping their leaves. Other trees in the area, including maple and oak, have been unaffected. Recently we received two different samples from affected trees.
Leaves are spotted with areas where the epidermis appears sunken.
Leaves are spotted with areas where the epidermis appears sunken. May 15, The symptoms appear to have followed this progression: leaves failed to develop normally so the leaves are"ragged" or uneven in appearance with small, irregular strips of the leaves dried out, turned brown and then dropped; the small, 2 to 6.
Aug 15, 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.
Hackberry psyllids are aphid-like jumping insects that are extremely common on hackberry trees. They are also called hackberry nipplegall makers due to the galls (raised growths) they form on. Q: There is a big hackberry tree in my back yard that provides welcome shade to our deck; we tolerate the leaves it also drops.
This fall the deck was covered with a sticky, saplike substance that turned a bright green umbrella black. It could also be seen on the leaves of nearby plants. A: You likely have a population of aphids in the tree.