oa Journal of the Entomological Society of Southern Africa - The origins, distribution and host range of the spotted alfalfa aphid, Therioaphis trifolii (Monell) f. maculata, with a description of its spread in South Australia



The spotted alfalfa aphid, T. trifolii f. maculata, is regarded as a variant form of the yellow clover aphid, T. trifolii, which is indigenous to Europe, northern Africa, the Middle East, Afghanistan and India. It has become established in the USA, eastern Canada, Mexico and, more recently, Australia and South Africa. In Australia it was first discovered on 29 March 1977 in Queensland and on 10 May 1977 in South Australia. An account is given of its spread to all the lucerne-growing areas in South Australia within a year of discovery. Factors influencing the spread of the aphid are discussed.


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