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.
Fluopicolide
Fluopicolide has been shown to be effective at controlling "[[Phytophthora infestans]]", "[[Phytophthora capsicii]]", "[[Phytophthora porri]]", "[[Plasmopara viticola]]", "[[Perenospora parasitica]]", "[[Peronospora tabacina]]", "[[Peronospora sparsa]]", "[[Pseudoperonospora cubensis]]" and "[[Bremia lactucae]]". As of 2007, it was only available commercially as a co-formulation with [[Fosetyl-Al]] for use in vines (as Profiler) and as a co-formulation with [[propamocarb]] for use on potatoes and vegetables (as Infinito). Other products were in development.