Poplar: Tent caterpillars categories: Ornamental trees Ornamentals Poplar Poplar Insects revision date: 2023-04-12 12:00 Tent caterpillars and webbingPhoto by: R.S. Byther Biology Two species of tent caterpillar are common in Washington. The forest tent caterpillar is about 2″ long at maturity and has a bluish body with black and white markings. This species makes silk […]
Poplar: Marssonina leaf spot categories: Ornamental trees Ornamentals Poplar Poplar Diseases revision date: 2022-11-28 12:00 Poplar Marssonina leaf spotPhoto by: R.S. Byther Biology Marssonina leaf spot is a fungal disease which is favored by wet weather. Leaves develop spots or flecks which are initially bronze or brown with yellow edges. These spots enlarge and may […]
Ornamental Plum: Armillaria root rot categories: Ornamental Plum Ornamental Plum Diseases Ornamental trees Ornamentals revision date: 2022-11-28 12:00 White fungal mat of Armillaria root rot infecting trunkPhoto by: C.R. Foss Biology Armillaria root rot is a fungal disease transmitted between plants by root contact. Armillaria is often found in newly cleared soils or ones which […]
Ornamental Plum: Brown rot categories: Ornamental Plum Ornamental Plum Diseases Ornamental trees Ornamentals revision date: 2022-11-28 12:00 Brown rot blossom infectionPhoto by: R.S. Byther Biology Brown rot is a fungal disease which initially infects the flowers. The petals turn light brown, develop water-soaked spots and may have tan or grayish areas of fungal spores. Infected […]
Ornamental Plum: Crown gall categories: Ornamental Plum Ornamental Plum Diseases Ornamental trees Ornamentals revision date: 2022-11-28 12:00 Large gall on crownPhoto by: R.S. Byther Biology Crown gall is a bacterial infection that can attack through wounds to the lower trunk, crown, or larger roots. Susceptible plants first develop soft warty or spongy swellings on the […]
Ornamental Plum: Cytospora canker categories: Ornamental Plum Ornamental Plum Diseases Ornamental trees Ornamentals revision date: 2022-11-28 12:00 Cytospora-infected peach twigsPhoto by: R.S. Byther Biology Cytospora canker infects the bark and cambium (the growing layer beneath the bark), and may be found in the outer layers of wood. Cuts into newly infected areas often reveal a […]
Ornamental Plum: Plum pockets categories: Ornamental Plum Ornamental Plum Diseases Ornamental trees Ornamentals revision date: 2022-11-28 12:00 Plum pocket infected fruitPhoto by: R.S. Byther Biology Plum pockets is caused by a fungal infection of the leaves, twigs, and small branches. The fungus overwinters on twigs or bud scales. Infection occurs on young plant parts in […]
Ornamental Plum: Shothole (Coryneum blight) categories: Ornamental Plum Ornamental Plum Diseases Ornamental trees Ornamentals revision date: 2022-11-28 12:00 Coryneum blight symptoms on leaves and fruitPhoto by: R.S. Byther Biology Coryneum blight is a fungal disease. Lesions on leaves are initially small, purplish, round to oval areas which expand into brown spots with light centers. The […]
Ornamental Plum: Silver leaf categories: Ornamental Plum Ornamental Plum Diseases Ornamental trees Ornamentals revision date: 2022-11-28 12:00 Silver leaf symptoms on leavesPhoto by: R.S. Byther Biology Silver leaf is a fungal disease which attacks the shoots, branches, trunk, and roots. The fungus is usually a saprophyte living on dead plant tissues, but it can attack […]
Ornamental Plum: Viruses categories: Ornamental Plum Ornamental Plum Diseases Ornamental trees Ornamentals revision date: 2022-11-28 12:00 Virus infection causing poor growth on branchesPhoto by: R.S. Byther Biology Virus diseases in prunes and plums cause many variable symptoms depending on the virus strain and the cultivar affected. For instance, tomato ringspot virus can cause failure of […]
Ornamental Plum: Hop aphid categories: Ornamental Plum Ornamental Plum Insects Ornamental trees Ornamentals revision date: 2023-04-04 12:00 Aphid colonyPhoto by: Unknown Biology Hop aphids are yellowish to bluish-green in color. They feed on plum, prune, cherry, and other hosts in the winter, then migrate to a summer host such as hops or sunflower. Some aphids […]
Ornamental Plum: Leaf curl plum aphid categories: Ornamental Plum Ornamental Plum Insects Ornamental trees Ornamentals revision date: 2023-04-04 12:00 Leaf curl plum aphidsPhoto by: R.D. Akre Biology The leaf curl plum aphid is typically pale green to yellow in color during the summer and darker green to brown later in the year. The aphids overwinter […]
Ornamental Plum: Peachtree borer categories: Ornamental Plum Ornamental Plum Insects Ornamental trees Ornamentals revision date: 2022-11-28 12:00 Peachtree borer and damage at base of treePhoto by: K. Grey Biology The western peachtree borer is the larvae of a clear-winged moth. Adult moths are blue-black, about 1″ across, have mostly transparent wings, and appear somewhat wasp-like. […]
Ornamental Plum: Pear slug categories: Ornamental Plum Insects Ornamental trees Ornamentals revision date: 2023-04-04 12:00 Pear slug and damaged leaf from feedingPhoto by: R.D. Akre Biology Pear slugs, or pear sawflies, are insect larvae which resemble a small greenish or black slug. They are typically 1/4″ to 1/2″ long, tadpole-shaped, and produce large amounts of […]
Ornamental Plum: Scales categories: Ornamental Plum Ornamental Plum Insects Ornamental trees Ornamentals revision date: 2023-04-04 12:00 Lecanium scales on twigPhoto by: R.S. Byther Biology Various species of scales attack ornamental plum trees. Depending on species, scales may be found on the upper or lower surfaces of leaves, or on twigs and branches. Symptoms of scale […]
Ornamental Pear: Fire blight categories: Ornamental Pear Ornamental Pear Diseases Ornamental trees Ornamentals revision date: 2022-12-05 12:00 Biology Fire blight is a bacterial infection which typically attacks via wounds or blossoms. Initially, twigs and flowers appear water-soaked. Infected tissues quickly turn brown to black and die back, often bending over in a characteristic “shepherd’s crook.” […]
Ornamental Pear: Pear trellis rust categories: Ornamental Pear Ornamental Pear Diseases Ornamental trees Ornamentals revision date: 2022-11-28 08:55 Upper and lower leaf surface on Pyrus sp.Photo by: F. Geller-Grimm, commons.wikimedia.org Biology Pear trellis rust is a fungal disease that attacks pear trees and junipers. It is commonly reported on pear leaves in western Washington. Like […]
Ornamental Pear: Powdery mildew categories: Ornamental Pear Ornamental Pear Diseases Ornamental trees Ornamentals revision date: 2022-11-27 04:06 Powdery mildew on apple leavesPhoto by: R.S. Byther Biology Powdery mildew is a fungal disease found on twigs, leaves, blossoms, and fruit. New growth is particularly susceptible. The entire terminal may become covered with powdery mildew. Leaves develop […]
Ornamental Pear: Pseudomonas blossom blast and dieback categories: Ornamental Pear Ornamental Pear Diseases Ornamental trees Ornamentals revision date: 2022-11-27 04:00 Pseudomonas cankers on pear twigsPhoto by: R.S. Byther Biology Blossom blast and dieback is caused by a bacterial infection. The infection causes buds to turn a papery brown and die. Leaves may be spotted. Flower […]
Ornamental Pear: Aphids categories: Ornamental Pear Ornamental Pear Insects Ornamental trees Ornamentals revision date: 2024-04-08 11:46 Green peach aphid closeupPhoto by: Unknown Biology Three aphids are commonly found infesting pear. All three species produce honeydew, a sweet, sticky material which attracts ants and that may become covered with a growth of dark sooty mold. Honeydew […]