Phytophthora inflata is an oomycete plant pathogen.

It was first identified in 1949 in Michigan, USA causing a pit canker on elm trees.

It was found in the United Kingdom in 1992 in the roots of Sambucus tenuifolium and Lilac (Syringa vulgaris), in 2003 it was found in a UK nursery infecting Rhododendron ponticum.

[1] In the same year it was found in a nursery in Ohio also infecting Rhododendron.

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