The Silverleaf whitefly (SLW), Bemisia tabaci Biotype B is a major production constraint in many parts of the world including the USA, Israel and other parts of the Middle East. Legumes, particularly soybean, have been virtually eliminated from many production systems in Texas and Arizona where SLW is now endemic. Cotton growers in the USA (Arizona) are faced with potential losses of up to $500 million annually, directly and indirectly from SLW. SLW was first discovered in Australia in 1994 by Dr. Robin Gunning (NSW department of Agriculture). Research by CSIRO scientists has since shown that it has spread throughout much of the east coast of Queensland and is now the dominant whitefly on both cultivated and wild host plants in the northern half of Australia. SLW has since become a troublesome pest of horticulture with frequent outbreaks in the Bower/Burdekin region and other coastal regions of Queensland and New South Wales. The spread of SLW into the central Queensland (CQ) cropping areas of Emerald and the Callide and Dawson valleys presents a serious and imminent threat to field crops including sunflower, peanut, grain legumes and cotton in these areas and other cropping regions further south.