The larvae of these hemimetabolous insects (with incomplete metamorphosis) resemble the adults. A number of species, such as aphids, have asexual generations and reproduce parthogenetically. They can produce several apterous, or wingless, generations, followed by winged generations which play a role in the species' dispersal. The last generation to appear during the season reproduces sexually, which means that this generation produces eggs, and Homoptera overwinter at this stage. Many aphid species have complex life cycles involving more than one host plant.
All the species are phytophagous and all, without exception, have a liquid diet (sap or plant juices). These insects occur in fields and forests.
Most species are diurnal or crepuscular.
Here are typical representatives of some families in this order. At least one species associated with these families is described in the site´s fact sheets.