Fungal pathogens of Calotropis procera (rubber bush), with two new recordsfrom Brazil

Fungal pathogens associated with the asclepiadaceous need Calotropis procer a (rubber bush) are documented from published; as well as unpublished sourc es. Two new host-pathogen associations from Brazil, Phaeoramularia calotrop idis and Puccinia obliqua, are recorded. The latter species infects the hos t systemically and induces the formation of conspicuous and damaging witche s' brooms. The rust appears to exert some control of C. procera in the more humid areas of Brazil and the biocontrol potential of this and the other l isted pathogens is discussed.