Phytophthora hedraiandra

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Phytophthora hedraiandra - oogonia with different types of antheridia: sessile (a, b), shortstalked (c, d), unilaterally intercalary (e), terminal (f, g) - scale bar = 10 μm (click on image to enlarge it)
Source: Studies in Mycology (2004) 50, 481-487

Phytophthora hedraiandra de Cock & Man in’t Veld 2004

This oomycete was originally described from a Viburnum plant with leaf spots in The Netherlands. It has been subsequently reported from other countries in Europe and in other regions, infecting a variety of plants. Apart from leaf spots, the symptoms include root rot, wilting, blights, stem canker and dieback. It might have be spreading to other countries with the international trade of ornamental plants (Moralejo et al., 2007).