In recent years sap-sucking bugs have been associated with early season damage.to cotton crops in most of the production centres in New South Wales and Queensland. Four species have been included in this pest complex: the green mirid (Creontiades dilutus), the apple dimpling (Campylomma livida),.the brown smudge bug (Deraeocoris signatus) and the rutherglen bug (Nysius.vinitor). The University of Queensland has conducted a number of preliminary studies on these bugs, concentrating on the green mirid. The studies conducted prior to the 1982-83 season have been discussed by Bishop (1980).and Adams and Pyke (1982). This paper summarises some of the results and observations made since 1982 from field cage, glasshouse and laboratory studies as well as unsprayed and commercial cotton crops.