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.
Frank Leslie Howard
He published a paper entitled "Anti-doting the toxin of "Phytophthora cactorum" as a means of Plant Disease Control" (Howard, 1941) and was included as a landmark in the fungicide history in the text "Fungicides and Their Action" (Horsfall, 1945). This paper described the control of tree diseases by chemotherapy and provides an alternative of vascular tree diseases such as Dutch elm disease.