Studies on Puccinia polysora Underw. II. Consideration of the method of introduction of Puccinia polysora into Africa
Transactions of the British Mycological Society 42(1): 27-32
Examination of herbarium specimens of world collections of maize rust has shown that, before 1949, Puccinia polysora, the American corn rust, was confined to the Caribbean area. The appearance of this rust in West Africa in 1949 raised the question of the method of introduction, the only source of infection at that time being over 3000 miles distant and separated by the Atlantic Ocean. A consideration of available evidence indicates that the pathogen was introduced as viable uredospores carried by air transport. The subsequent spread and severity of the epiphytotic emphasize the importance of this introduction in relation to plant quarantine.