These east-west-oriented mountains are located north of the greater Los Angeles Metropolitan area. They feature low-elevation chaparral, oak woodland and savanna, and pinyon-juniper woodlands, and higher-elevation forests that include white fir, Jeffrey pine, sugar pine, and lodgepole pine.
Typical insect and disease problems
• Native bark beetles including Ips, Scolytus, and Dendroctonus species
• Heterobasidion root disease
• Douglas-fir tussock moth
• True mistletoes in oaks
• Dwarf mistletoes in conifers