Phytophthora evolution (IMAGE)

University of California - Berkeley

Phytophthora evolution

Caption

These Petri dishes show colonies of two strains of the exotic pathogen Phytophthora ramorum, the parasite behind Sudden Oak Death, on a growth medium that contains a phosphite fungicide. The EU1 strain of P. ramorum (left) is phosphite-tolerant and grows well. The NA1 strain (right) is still phosphite-sensitive and its growth is inhibited. California forests have been colonized by NA1 strains, but phosphite-tolerant EU1 strains have recently been found in Southern Oregon.

Credit

Matteo Garbelotto, U.C. Berkeley photo

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