Phytophthora plurivora

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symptoms of infections by Phytophthora plurivora - top row: beech Fagus sylvatica and oak Quercus robur crowns, middle row: roots of beech and oak, bottom row: trunk symptoms on beech and at right Rhododendron dieback (click on image to enlarge it)
Authors: T. Jung and T.I. Burgess
Source: Persoonia (2009), vol. 22 p. 96
Phytophthora plurivora - different forms and development stages of sporangia, see original for details (click on image to enlarge it)
Authors: T. Jung and T.I. Burgess
Source: Persoonia (2009), vol. 22 p. 103

Phytophthora plurivora T. Jung & T.I. Burgess 2009

This oomycete is wide-spread, highly aggressive and infects various, mainly woody host plants like forest trees. It has been reported from North America and Europe since the 1990s, initially mainly from nurseries, and appears to be a recent introduction there. On the other hand, it had been misidentified in Western Australia for around 30 years as Phytophthora citricola, a closely related species.

The species causes dieback of shoots and crowns, small-sized and often yellowish foliage, extensive fine root losses, root lesions, collar rots and aerial cankers. It is homothallic with paragynous antheridia, semipapillate persistent sporangia, does not form catenulate hyphal swellings and has a growth optimum around 25 °C, see Jung and Burgess, 2009.