Cherry: Armillaria root rot categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 White fungal mat of Armillaria root rot infecting trunkPhoto by: C.R. Foss Biology Armillaria root rot is a fungal disease often found in newly cleared soils or soils which have been flooded. Aboveground symptoms typically include production of smaller-than-normal leaves, leaf […]
Cherry: Bacterial canker categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Bacterial canker on tree trunkPhoto by: R.S. Byther Biology Bacterial canker is favored by cool, wet weather and is common in western Washington. The bacteria overwinter in cankers, buds and other host tissues. Dark cankered areas on trunks and branches may develop […]
Cherry: Black knot categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Mature black knot on twigPhoto by: R. Byther Biology Black knot is a fungal disease that infects cherry and plum. Early infections of twigs are elongated olive-green, corky knots. They turn black and hard as they mature. Every year they expand lengthwise. […]
Cherry: Brown rot blossom blight and fruit rot categories: Cherry Cherry Diseases Tree Fruits revision date: 2023-01-31 12:00 Brown rot blossom infectionPhoto by: R.S. Byther Biology Brown rot is a blossom-infecting fungal disease. Infected flowers wilt and die. The brown blossoms remain attached to the twigs, becoming covered with a grayish-brown fungal growth during wet […]
Cherry: Crown gall categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Large gall on crownPhoto by: R.S. Byther Biology Crown gall is caused by a soilborne bacterium. The bacteria infect through wounds on the crown and roots. Young galls are fleshy, white, enlarged masses on the roots or stems. Older galls are hardened […]
Cherry: Cytospora canker categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Cytospora-infected peach twigsPhoto by: R.S. Byther Biology The fungi which cause Cytospora canker attack through wounds on twigs and branches. Initial cankers are small, but enlarge quickly and may streak up and down the stems without girdling. The cankers may also girdle […]
Cherry: Dead bud categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Dead buds on branchPhoto by: R.S. Byther Biology Dead bud is a common symptom caused by the same bacterium which causes bacterial cankers. Initial symptoms are death of buds on lower branches of the affected trees. This begins in February prior to […]
Cherry: Gumming (Gummosis) categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Cherry gummosis in branch crotchPhoto by: R.S. Byther Biology Gumming of cherry can be caused by several factors. It can be a physiological reaction to unfavorable growing conditions. Trees growing in damp conditions often produce gum, as do trees which have received […]
Cherry: Leaf spot categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Cherry leaf spot symptomsPhoto by: C.R. Foss Biology Leaf spot of cherry causes purple to reddish-brown spots on the leaves. The spots are up to 1/10″ in diameter. In wet weather, the underside of the spots may produce cream-colored to pinkish masses […]
Cherry: Little cherry categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Little cherry virus symptoms on fruitPhoto by: OSU slide library Biology Little cherry is caused by a virus transmitted by the apple mealybug and by grafting. Affected trees show symptoms primarily on the fruit, which may be smaller than normal, slow to […]
Cherry: Mottle leaf categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Cherry mottle leaf virus symptoms on leavesPhoto by: R.S. Byther Biology Mottle leaf is a virus disease of cherries. Symptoms are seen mainly on the leaves, which are puckered and mottled with light green to yellow blotches between the veins. The mottling […]
Cherry: Necrotic rusty mottle categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Necrotic rusty mottle symptoms on cherry leavesPhoto by: R.S. Byther Biology Necrotic rusty mottle is believed to be caused by a virus. Affected trees are slower to leaf out and bloom in the spring. Terminal buds may be killed and the […]
Cherry: Powdery mildew categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Powdery mildew on leafPhoto by: G.G. Grove Biology Powdery mildew attacks leaves, young shoots, and fruit. This fungal disease initially produces a light green, circular spot on either leaf surface. Later, a characteristic white, powdery coating of the fungus appears, typically on […]
Cherry: Prunus necrotic ringspot categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Prunus necrotic ringspot virus symptomsPhoto by: M.L. Putnam Biology Prunus necrotic ringspot is a viral disease affecting most cultivated Prunus species. Leaves may show various symptoms including brown, sunken, necrotic spots; chlorotic (yellowish to white) blotches or other patterns; or dark […]
Cherry: Shothole (Coryneum blight) categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-08 12:00 Coryneum blight symptoms on leaves and fruitPhoto by: R.S. Byther Biology Shothole is a fungal disease typically attacking leaves and fruit on cherry. Lesions on leaves are initially small, purplish, round to oval areas which expand into brown spots with light […]
Cherry: Verticillium wilt categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Vascular discoloration in branch from Verticillium wiltPhoto by: C.R. Foss Biology Verticillium wilt is caused by a soilborne fungus. It infects via the roots and then spreads throughout the plant. Aboveground symptoms include suddenly wilted yellow or brown foliage which hangs on […]
Cherry: Witches’-broom (Cherry leaf curl) categories: Cherry Cherry Diseases Tree Fruits revision date: 2022-12-05 12:00 Witches’ broom symptoms on cherry branchesPhoto by: R.S. Byther Biology Witches’-broom disease of cherry is a fungal disease similar to peach leaf curl. Infected branches develop large, dense, broomlike tufts of foliage. These branches typically do not produce flowers or […]
Cherry: Apple-and-thorn skeletonizer categories: Cherry Cherry 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. The skeletonizer overwinters as a pupa or an adult, with the females laying eggs in the spring. The caterpillars […]
Cherry: Black cherry aphid categories: Cherry Cherry Insects Tree Fruits revision date: 2023-04-04 12:00 Curled, distorted leaves from black cherry aphid feedingPhoto by: A.L. Antonelli Biology The black cherry aphid is a shiny, black, pear-shaped insect. Sweet cherry is the preferred host. The soft-bodied aphids feed in colonies on the tips of new growth, causing […]
Cherry: Brown marmorated stink bug categories: Cherry Cherry Insects Tree Fruits revision date: 2023-04-04 12:00 Brown marmorated stink bug adultPhoto by: M. Bush 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 a wide variety of plant […]