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.
Black pod disease
There is no specific variety of cocoa that shows resistant to "Phytophthora" infections and the establishment and utilization of resistant variety will be most likely depends on the region. Numerous breeding programs have been established worldwide in order to screen and test for local hybrids for disease resistant of P"hytophthora spp". For example, a study in Cameroon assessed the performance of local cocoa cultivars (the southern and northern Cameroon cultivar) compared to the local and international gene bank cultivars. The local genebank cultivar consisted of F1 hybrid of Upper Amazon X Trinidad, and an international cultivar from Papua New Guinea, and Latin America were provided through International Cocoa Genebank, Trinidad. Based on the information provided by farmers and leaf disc test to assess resistant variety, the local cultivars selected from farmers field showed some resistant to "P. megakarya" compared to other varieties. Thus, it was concluded that there are some potential resistant varieties available in this area. In addition, some molecular work on developing resistant varieties to black pod is being done by CEPLAC (Executive Plan of Cocoa Farming) agency in Brazil and hopefully more breeding program focusing on black pod resistant will be established and produced commercialized resistant varieties.