Invasive Species Compendium

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Abstract Full Text

First report of Sawadaea bicornis (Wallr.) Miyabe causing the powdery mildew of maple in Mendoza, Argentina.


A strong defoliation of Acer negundo L. specimens was observed during the 2001-2002 vegetative cycle in the Province of Mendoza (Argentina). It was further noted that the leaves had chlorotic spots covered with a whitish powdery coating, which afterwards necrotized and pierced the leaf tissue. When a high percentage of the surface of the leaf was affected, the leaf would drop prematurely. The sign observed was produced by fungal fructifications of the genus Oidium. Morphometric measurements and bibliographic searches led us to conclude that the agent was Sawadaea bicornis (Wallr.); this being the first time the microorganism is cited for Mendoza.