Bacterial Spot of Tomato and Pepper in Africa: Diversity, Emergence of T5 Race, and Management

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Bacterial spot disease was first reported from South Africa by Ethel M. Doidge in 1920. In the ensuing century after the initial discovery, the pathogen has gained global attention in plant pathology research, providing insights into host–pathogen interactions, pathogen evolution, and effector discovery, such as the first discovery of transcription activation-like effectors, among many others. Four distinct genetic groups, includingXanthomonas euvesicatoria(proposed name:X. euvesicatoriapv.euvesicatoria),Xanthomonas perforans(proposed name:X. euvesicatoriapv.perforans),Xanthomonas gardneri(proposed name:Xanthomonas hortorumpv.gardneri), andXanthomonas vesicatoria, are known to cause bacterial spot disease. Recently, a new race of a bacterial spot pathogen, race T5, which is a product of recombination between at least twoXanthomonasspecies, was reported in Nigeria. In this review, our focus is on the progress made on the African continent,vis-à-visprogress made in the global bacterial spot research community to provide a body of information useful for researchers in understanding the diversity, evolutionary changes, and management of the disease in Africa.

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