A group of ponderosa pine killed by dwarf mistletoe. South Rim of the Grand Canyon, Arizona. Photo by: Frank G. Hawksworth Date: 1965 Credit: USDA Forest Service, Region 6, State and Private : Forestry, Forest Health Protection. Source: FHP digital collection; Regional Office; Portland, Oregon. For more see: Hawksworth, F.G. 1961. Dwarfmistletoe of ponderosa pine in the Southwest. USDA Forest Service. Technical Bulletin Number 1246. naldc.nal.usda.gov/download/CAT87201189/PDF Image provided by...
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