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 […]