Why they are a Pest
They are sap suckers like green mirids and brown mirids, feeding on a variety of plants and favouring legumes, sunflowers, clover, lucerne and wheat crops. Weeds such as thistle are host crops.
They feed on new growth and release a chemical that destroys cell walls, which weakens the plant and results in poor growth.
They also attack flower buds which inhibits flower, fruit and seed formation. They do not seem to be as bad a pest as green or brown mirids.