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This specific gall is caused by a psyllid on hackberry trees. While galls may be unsightly, they do not cause serious harm to trees. Scales of various types may be found on hackberry as well. Hackberry nipplegall maker Hackberry blister gall psyllid Pachypsylla celtidismamma Pachypsylla celtidivescula Order Hemiptera, Family Psyllidae; psyllids or jumping plant lice Native pests Host plants: Hackberry Description: Adults are called psyllids or jumping plant lice that very much resemble miniature cicadas. Depending on the product used, it can be applied in the fall or early spring. These distinct galls, caused by an aphid, are about 1" long and about 1/4 inch high. Symptoms and Diagnosis. Once you see galls on your tree, it is too late to treat that year. Galls are generally created by a reaction within the plant tissue due to feeding from the immature insect (nymph). Hackberry psyllids are small aphid-like insects that cause the galls commonly seen on the underside of hackberry tree leaves. Your best management tool is patience. The petiole gall psyllid is usually not sufficiently abundant to cause serious damage to its host, but gall infested leaves are unsightly during late fall and winter. The other option is to use a systemic insecticide that will make timing less of an issue. It produces bumpy, grayish bark … Dormant oil sprays may help reduce a hackberry gall problem. From the U of M Extension site, and from other states' sites, I have learned that the galls are not harmful to the trees, and could be ignored. Fortunately, hackberry is one of the toughest trees we have in the landscape and it seems to be unaffected by the galls and early leaf drop--so there is no need to worry, apply insecticides or cut the tree down. Pests: One common insect on the tree causes hackberry nipple gall. Here are nine natural treatments you might want to try to get rid of them. Neonicotinoids have been associated with honey bee colony collapse and have been mostly banned in Europe. However, the timing for this pest can be tricky, and if the insect has fed it may still cause the reaction within the leaf tissue. "You can't get in your car. Elm Cockscomb Gall. Hackberry psyllids are a pest that causes hackberry trees to form galls around the larvae to protect the tree and leaves. Galls are abnormal growths of plant tissue induced by insects and other organisms. Hackberry Tree Galls. Insects on Hackberry Trees. This feeding causes an abnormal growth within the leaf tissue, which then encases the insect and protects it while it feeds and grows. Gall-making parasites release growth-regulating chemicals as they feed, causing adjacent plant tissues to form a gall. Chemical applications often are not effective because the precise timing of sprays is critical. 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