The Oregon grape plant is an evergreen shrub that bears small, edible fruit clusters. Even though the name contains "grape," this plant is not related to grape plants. Meriwether Lewis discovered the Oregon grape plant in 1806, and it was named by Berberis aquifolium in 1814. This plant is the Oregon state flower and it grows from British Columbia, Canada down to the state of California. It's a hardy plant susceptible to only a few problems such as rust, pests in the form of birds and powdery mildew.
Oregon grape plants are generally disease and pest free. Birds are, on occasion, a major pest to this plant because they like to eat its berries. Netting is the best solution for dealing with birds; place it over your Oregon grape plants to protect them.
Another potential issue Oregon grape plants face is rust, a fungal disease caused by Puccinia graminis or Cumminsiella mirabilissima, both fungi that can grow on these plants. Rust is known to spread as a result of infecting plants in nurseries where it isn't regulated. It appears on infected plants as red spots on leaves. The best way to control rust is by using irrigation methods that don't involve watering from overhead. Other ways to take care of rust is by picking off dead leaves and disposing of them.
Oregon grape plants are, on occasion, are also susceptible to powdery mildew, which appears as a white, powdery substance over the top of the plant leaves. Powdery mildew fungus growth is removed by rubbing the leaves together, but this method may not entirely get rid of the problem. Another method is to remove all of the infected leaves and dispose of them.