Red Scale (Aonidiella aurantii) is a major pest of citrus in Australia. The severity of the infestation depends on the kind of citrus crop (lemons, grapefruits, oranges and mandarins). Red scale is an armoured scale insect which does not produce honeydew. However, its feeding may produce leaf drop, blemish fruit and damage plant tissue. The damage caused by red scale affects fruit quality due to pitting, green spotting or the physical presence of scale on mature fruit.