Tile green mirid, Creontiades dilutus (Stal) is one of the early season pests of cotton. This insect was identified in the late 1970's and can cause considerable damage to cotton seedlings and squares resulting in significant delays in growth and maturity of the plant (Bishop 1980; Adams and Pyke, 1982). Currently green minds are suppressed by synthetic insecticide sprays targeted for the control of Helicoverpa spp. in commercial cotton. With the proposed introduction of Bt cotton, green mirids are going to be very important since chemical sprays against Helicoverpa spp. Are expected to be reduced (Fitt, pers. communication). Despite the importance of the green mirid within the Australian cotton industry, there is no detailed information on the life cycle and general biology of this insect. A detailed biological information can provide a basis for ecological studies and the development of a sustainable pest control system. We report here the life cycle, oviposition behaviour, and the pest status of the green mind.