Oogonium with paragynous antheridia close to oogonial stalk. Oospores are slightly aplerotic.
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P. cactorum oogonium  |
P. cactorum bleeding canker  Bleeding canker on European beech (Fagus sylvatica) |
P. cactorum bleeding canker  Bleeding canker on European beech (Fagus sylvatica) |
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Phytophthora cactorum disease symptoms on English walnut  Dieback of Juglans regia caused by Phytophthora cactorum |
P. cactorum bleeding canker  Bleeding canker on red oak (Quercus rubra) |
P. cactorum sporangia  Broadly ovoid, papillate sporangia in water. |