"However, there have been a number of whitebark pine trees found to be resistant to the nonnative pathogen white pine blister rust, which has been a major threat to whitebark and other five-needled pines since the early 20th century."
"Experience has indicated that many of the oldest five-needled pines have experienced cambial dieback to varying degrees."
"These mycorrhizal fungi are specific to five-needled pines, including whitebark and limber pines."