Psyllids are plant-feeding insects that suck plant juices similarly to aphids, but with more noticeable damage. Also called jumping plant lice, psyllids are extremely host specific and are commonly found on citrus, olive, tomato and potato plants. Their feeding can result in the development of unsightly galls (abnormal growths) at plant terminals and on foliage that can stunt growth and reduce plant vigor. One of the many long-term problems psyllid populations pose is the transmission of non-native diseases that they vector including Citrus Greening (Huanglongbing), which is carried by the Asian Citrus Psyllid. Additionally, psyllids produce large amounts of honeydew as they feed which provides favorable conditions for sooty mold and other fungal pathogens to propagate and grow.

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