Journal Article South Africa microsatellite markers <italic>Ficus pumila</italic> <italic>Phakopsora nishidana</italic> <italic>Puccinia sorghi</italic> Fig rust Genetic Markers Helianthus annuus Maize Puccinia graminis f. sp. tritici Puccinia helianthi Puccinia triticina Research Support, Non-U.S. Gov't Triticum aestivum cereals and grains cultivar/resistance disease development and spread disease management epidemiology field crops fungi genotypic variation leaf rust new races pathogen diversity pathogenic variation races sunflower rust wheat