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P. cambivora sporangium

Ovoid non- papillate sporangia

P. austrocedrae - Mal del ciprés, stages of decline

Mal del ciprés, stages of decline

P. cinnamomi hyphal swelling

P. cinnamomi hyphal swelling (or thin walled chlamydospores)

Vehicle washing

Truck washing to avoid spread of P. lateralis

P. tentaculata disease symptoms on sticky monkey flower

Crown and root rot (left) on sticky monkey flower (Diplacus aurantiacus) compared with a control (right)

P. agathidicia sporangia

Differentiation of the cytoplasm within papillate sporangia into acid fuchsin stained zoospores

P. kernoviae leaf wilt

Wilted leaf of infected rhododendron

P. cactorum colony morphology on V8

Colony morphology on V8 at 14 days

P. alni in riparian alder, Scotland

P. alni in riparian alder, Scotland

P. alni oogonium

Bullate oogonium of P. alni (German variant) with oospore and amphigynous antheridium.

P. palmivora symptoms on fruit

Brown rot on a lemon fruit caused by Phytophthora palmivora.

P. arenaria disease symptoms on Banksia

Dead Banksia sp. in a Kwongan heathland on mineral sand near Eneabba, Western Australia recently killed by root and collar rot caused by Phytophthora arenaria

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