How'd you ID Phytopthera as the culprit Willie?
Plant pathology Report?
http://caforestpestcouncil.org/wp-content/uploads/2013/12/Bill-Woodruff.pdf
I do trunk drenches twice a year, fall n spring, battling SOD/Phytopthera remorum infected oaks, for some time now, with good affect.
Jomo