psiminids

Psylids, also known as psyllids or jumping plant lice, are small, sap-feeding insects belonging to the superfamily Psylloidea. They are closely related to aphids and whiteflies. Psylids are found worldwide, inhabiting a diverse range of plant hosts, and are particularly common in temperate and tropical regions.

Adult psylids are typically winged, though some species are wingless. They are characterized by their short, bristle-like antennae and their ability to leap considerable distances using their powerful hind legs. Their feeding habits involve piercing plant tissues with their stylets to extract sap. This feeding can cause various symptoms on host plants, including yellowing of leaves, stunted growth, and the formation of galls.

Many psyllid species are known for their ability to transmit plant diseases, particularly viruses. These diseases can have significant economic impacts on agriculture and horticulture. For example, the Asian citrus psyllid (Diaphorina citri) is a vector for citrus greening disease (huanglongbing), a devastating disease affecting citrus crops globally.

The life cycle of psylids generally involves several nymphal instars before reaching adulthood. Some species produce a characteristic waxy covering or "lerp" secreted by the nymphs, which serves as protection. Control of psylids often involves a combination of cultural practices, biological control agents, and, in some cases, chemical insecticides, especially when they are vectors of serious plant pathogens.