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.
Phytophthora erythroseptica
Chemical control can be difficult due to resistance development to some fungicides. Also there are few fungicidal modes of action that are effective. This includes the formerly successful metalaxyl, which is now widely ineffective due to resistance exhibited in the pathogen. Mefenoxam is another fungicide that pink rot pathogens have shown resistance against. However, research has shown that a combination of mefenoxam and oxathiapiprolin has demonstrated effectiveness on suppressing pink rot. There have been studies done on phosphorous acid (Phostrol) as a systemic and contact fungicide against pink rot, but the exact mode of action has not yet been determined. Fluopicolide, part of the benzamide class of fungicides, has been shown to be effective at reducing pink rot on field scales. There has not yet been cross-resistance between fluopicolide and mefenoxam, meaning these fungicides can be used rotationally to minimize the development of resistance.