Phytophthora ramorum
Trials of silvicultural methods for treating "P. ramorum" began in Humboldt County in northwest coastal California in 2006. The trials have taken place on a variety of infested properties both private and public and have generally focused on varying levels and kinds of host removal. The largest () and most replicated trials have involved removal of tanoak and bay laurel by chainsaw throughout the infested stand, both with and without subsequent underburning designed to eliminate small seedlings and infested leaf litter. Other treatments included host removal in a modified “shaded fuelbreak” design in which all bay laurel is removed, but not all tanoaks; bay and tanoak removal using herbicides; and removal of bay laurel alone. The results of these treatments are still being monitored, but repeated sampling has so far detected only very small amounts of "P. ramorum" in the soil or on vegetation in the treated sites.
Hippophae rhamnoides
Methods to control the disease include removing and burning infected branches, not replanting "H. rhamnoides" at the same site for 3–5 years, and avoiding to make cuttings from infected plants. Antagonistic fungi like "Trichoderma" sp. or "Penicillium" sp. can be used to combat wilt disease in plants infected by "Plowrightia hippophaes". Additionally, four strains of "Cladothrix actinomyces" were found to be usable as antagonistic fungi in "H. rhamnoides" plants infected by "Fusarium sporotrichioides". Cultivars of "H. rhamnoides" that were relatively resistant to wilt disease have also been identified.