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The most infamous of the various types of whitefly is the "B" biotype of Bemisia tabaci, also known as the silverleaf whitefly, Bemisia argentifolii. This "super bug" was first identified in the Middle East, but introduced into Florida in the 1980s, and is spreading throughout Latin America. The UK's Department for International Development has funded several projects on whitefly-borne viruses of major food crops in Africa and India, mainly through the DFID Crop Protection Programme. Several of the current CPP projects, or their precursors, have had links with the Tropical Whitefly Integrated Pest Management Project and share similar characteristics: 1. Crops involved have a clear poverty focus. 2. Projects work with farmers developing controls appropriate to their circumstances. 3. Resistant varieties have a key role in control with the use of cultural measures such as mixtures and phytosanitation. 4. Key epidemiological information is sought on the whitefly vector and sources of the virus.