Apple: Perennial canker (Bull’s-eye rot) categories: Apple Apple Diseases Tree Fruits revision date: 2022-12-05 12:00 Apple bull’s eye rotPhoto by: G.G. Grove Biology Perennial canker is a fungal disease. It is similar to anthracnose, but occurs primarily east of the Cascades in Washington. The characteristic symptom of perennial canker is a sunken canker surrounded by […]
Apple: Phytophthora fruit rot categories: Apple Apple Diseases Tree Fruits revision date: 2022-12-05 12:00 Phytophthora fruit rotPhoto by: G.G. Grove Biology Phytophthora fruit rot is caused by a soilborne fungus which can also be found in and carried by irrigation water. Infection occurs when water contacts fruit on low-hanging limbs or when overhead watering is […]
Apple: Powdery mildew categories: Apple Apple Diseases Tree Fruits revision date: 2022-12-05 12:00 Powdery mildew on apple foliagePhoto by: M. Bush Biology Powdery mildew of apple is a fungal disease found on twigs, leaves, blossoms, and fruit. New growth is particularly susceptible, since the fungus overwinters in buds. The entire terminal may become covered with […]
Apple: Scab categories: Apple Apple Diseases Tree Fruits revision date: 2022-12-05 12:00 Apple scab on fruitPhoto by: R.S. Byther Biology Apple scab is caused by a fungus which also causes scab on crabapple and hawthorn. The first infections occur during wet weather in the spring. Initially, the disease causes tiny, pale, chlorotic, water-soaked spots on […]
Apple: Virus diseases categories: Apple Apple Diseases Tree Fruits revision date: 2023-03-20 12:00 Apple mosaic virus foliar symptomsPhoto by: R.S. Byther Biology Virus diseases of apples are rarely significant problems in home orchards. Symptoms are most commonly seen as bark disorders, leaf mottling, or misshapen fruit. One of the more common virus problems is apple […]