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.
Xiphinema index
Infected roots should be removed from the vineyard, and a non-host should be grown for several years, if possible. Historically, this pest has been managed by the use of chemical fumigants, such as 1,3-Dichloropropene and Methyl Bromide. There are few post-plant chemical options to manage this pest. These fumigants must be applied deeply in the soil to be effective, as the nematode can reside deeply in the soil and thus resist attempts to eradicate it completely. Rootstocks that are bred for resistance to both GFLV and "X. index" have proven to be effective at managing the disease. An effective rootstock must be resistant to both the virus and the nematode. Hot water treatments of rootstocks to be planted ensures there will be little chance of the introducing the disease into the field. Preventing the introduction of infected plant or soil material is essential to manage both "X. index" and GFLV.