Occurrence of white rust (Albugo ipomoeae-panduratae) on Ipomoea acuminata in the brazilian mid-west

spontaneous plants of ipomoea acuminata ("morning glory") exhibiting white rust pustules were found in a field crop area of planaltina, df, in the fall season of 2010 and the disease causal agent was identified as albugo ipomoea-panduratae (oomycota). no reports of the association between a. ipomoea-panduratae and i. acuminata were known in brazil previously to 2010. a reference specimen was deposited at the university of brasilia mycological reference collection.