The timing is challenging and the management of galls is difficult and not practical. It is possible to treat your trees before galls are produced in the spring but this is not encouraged. Cutting a tree down in the yard does not guarantee you will not have psyllids they can still come to your home from nearby hackberry trees in the neighborhood.Mature, healthy trees are very valuable in the landscape.It is not recommended to cut down hackberry trees in your yard to prevent psyllid problems. If there is a hackberry tree in your yard When these insects are found indoors, remove them by physical means, such as by hand with a tissue or a vacuum. Physically remove any insects found inside Keep outside lighting turned off or install lights, such as yellow lights, that are less attractive to insects. Psyllids are attracted to lights at night.Install a rubber seal along the bottom of garage doors. Install door sweeps or thresholds to all exterior entry doors.Repair or replace damaged window and door screens along with any damaged screens in roof and soffit vents, or bathroom and kitchen fans.Install storm windows and 18 mesh size screens to keep out psyllids.Seal cracks and spaces around doors, windows, fascia boards and similar places, and where utility wires and pipes enter buildings.How to get rid of these insects Keep them out by pest-proofing building exteriors Small to moderate numbers of psyllids may be seen, although the numbers vary from year to year.They are small enough that they can pass through most screens and are especially common around windows.Otherwise, psyllids are harmless to people, pets and property. These “bites” are annoying but nothing more. Psyllids sometimes may prick the exposed skin of people as they ‘taste test’ us looking for food. celtidismamma produce hackberry nipple galls on the underside of leaves. Pachypsylla celtidivesicula is responsible for hackberry blister galls on the upper surface of leaves.Galls can affect the appearance of leaves but do not harm a healthy, mature tree even when large numbers are present. These insects only produce galls in hackberry trees. Hackberry psyllids cause plant galls commonly seen on hackberry leaves. Psyllids complete their development in late summer and adults exit the galls to spend the winter in protected sites, such as cracks and crevices of tree bark and other sheltered locations, including buildings. The psyllids live and feed inside these galls for the rest of the summer.This feeding causes the leaves to form abnormal plant tissue (galls) surrounding individual psyllids.Eggs hatch into tiny nymphs that feed on the leaves.Adult psyllids emerge from their overwintering sites in early spring and fly to hackberry trees to lay eggs in developing leaves.
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