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 […]
Apple: Aphids categories: Apple Apple Insects Tree Fruits revision date: 2023-04-04 12:00 Rosy apple aphidsPhoto by: R.S. Byther Biology Three aphids are important pests of apple. Green apple aphids feed throughout the growing season on terminals, causing twisted and deformed leaves and stunted shoots. They produce honeydew, a sweet, sticky material which may become covered […]
Apple: Apple ermine moth categories: Apple Apple Insects Tree Fruits revision date: 2023-04-04 12:00 Apple ermine mothPhoto by: A.L. Antonelli Biology The apple ermine moth is an imported pest which feeds exclusively on apples. The adult moth has silver-white wings spotted with black. Larvae are gray, cream-colored, or greenish with dark spots along the sides. […]
Apple: Apple maggot categories: Apple Apple Insects Tree Fruits revision date: 2024-04-10 03:43 Apple maggot tunnelingPhoto by: M. Bush Biology The apple maggot is potentially a serious pest of apples. Transportation of home-grown fruit from infested to non-infested areas is prohibited in Washington. The adult apple maggot is a small fly about 1⁄4″-3⁄8″ in length. […]
Apple: Apple-and-thorn skeletonizer categories: Apple Apple Insects Tree Fruits revision date: 2022-12-05 12:00 Apple-and-thorn skeletonizer caterpillar feeding on leafPhoto by: A.L. Antonelli Biology The adult of the apple-and-thorn skeletonizer is a small dark-brown or reddish-brown moth. It overwinters as a pupa or an adult, with the females laying eggs in the spring. The caterpillars are […]
Apple: Brown marmorated stink bug categories: Apple Apple Insects Tree Fruits revision date: 2023-04-04 12:00 Brown marmorated stink bug damage to apple fruitPhoto by: D. Pfeiffer, Virginia Tech Biology The brown marmorated stink bug (BMSB) is an introduced pest species from Asia that is spreading quickly across the United States. Nymphs and adults feed on […]