Mistletoe

Mistletoe (Arceuthobium) grows as a parasitic plant on Oregon white oak and other hardwoods, gradually weakening branches. Remove infested branches or hand-pick the parasite before spores mature. Heavily infested trees may warrant removal. Separate host species (oaks, hawthorn) from conifers if possible.

Cut out affected host branches. New sprouts will grow if only the aerial shoots are removed. Remove infected material promptly and improve growing conditions to limit pathogen spread. Good sanitation, adequate spacing, and proper irrigation practices reduce disease pressure over time.