Arctostaphylos tomentosa (Pursh) Lindl.

are eaten by

• Global Biotic Interactions: Colladonus espinosus Nielson 1957
• Global Biotic Interactions: Colladonus arctostaphyli Downes 1952
• Global Biotic Interactions: Agrilus arbuti Fisher 1928
• Global Biotic Interactions: Colladonus commissus Van Duzee 1917
• Global Biotic Interactions: Colladonus holmesi Bliven 1954

are host of

• Global Biotic Interactions: Saturnia mendocino (Behrens 1876)
• Global Biotic Interactions: Tamalia coweni (Cockerell & T. D. A. 1905)
• Global Biotic Interactions: Tamalia coweni (Cockerell & T. D. A. 1905)
• Global Biotic Interactions: Exobasidium vaccinii-uliginosi Boud. 1894
• Global Biotic Interactions: Epinotia emarginana Walsingham 1879

are parasitized by

• Global Biotic Interactions: Chrysobothris mali Horn 1886

have flowers visited by

• Global Biotic Interactions: Battus philenor (Linnaues 1771)