Viburnum: Viburnum leaf beetle categories: Ornamentals Shrubs Viburnum Viburnum Insects revision date: 2022-12-04 12:00 Viburnum leaf beetle larvae and damagePhoto by: T. Murray Biology Viburnum leaf beetles overwinter as eggs on the previous year’s new stems. Larvae hatch in spring and begin to feed on the new viburnum leaves. Larvae are pale yellow to pale […]
Vertebrate: Moles categories: Vertebrates revision date: 2022-12-28 12:00 MolePhoto by: D. Pehling Biology There are three species of moles in the Pacific Northwest which are considered a problem in landscapes. The Townsend’s mole (Scapanus townsendii) is the most common and is found throughout western Washington and Oregon. The Pacific or coast mole (S. orarius) can […]
Skimmia: Spider mites categories: Ornamentals Shrubs Skimmia Skimmia Insects revision date: 2024-06-05 02:04 Citrus red mite damage on skimmiaPhoto by: R.S. Byther Biology Spider mites vary in color from green to reddish to brown. They are extremely small and may be barely visible to the naked eye. Mites are commonly found on the underside of […]
Pyracantha: Scab categories: Ornamentals Pyracantha Pyracantha Diseases Shrubs revision date: 2024-06-05 02:07 Pyracantha scab on leavesPhoto by: R.S. Byther Biology Pyracantha scab is caused by a fungus that overwinters in infected leaves, twigs, and berries. Young leaves and berries are most susceptible to infection. Olive green to black spots develop on leaves, twigs and fruit. […]
Pieris (Andromeda): Leaf spot categories: Ornamentals Pieris (Andromeda) Pieris (Andromeda) Diseases Shrubs revision date: 2024-06-05 02:07 Biology Leaf spot of andromeda is a fungal disease causing necrotic (dead) spots on the leaves. Spots are circular or angular in outline, and typically are red to brown, sometimes with silvery-gray centers. Fruiting structures of the fungus may […]
Pieris (Andromeda): Ramorum leaf and shoot blight (Sudden oak death) categories: Ornamentals Pieris (Andromeda) Pieris (Andromeda) Diseases Shrubs revision date: 2022-12-03 12:00 P. ramorum symptoms on Pieris leavesPhoto by: M. Elliott Biology Ramorum leaf blight is caused by Phytophthora ramorum, the same organism that causes sudden oak death (SOD). In Washington, most cases have been […]
Pieris (Andromeda): Root rot & dieback categories: Ornamentals Pieris (Andromeda) Pieris (Andromeda) Diseases Shrubs revision date: 2022-12-03 12:00 Pieris root rot and diebackPhoto by: J.W. Pscheidt Biology Root rot and dieback of andromeda is caused by Phytophthora, a fungus which affects many ornamentals. Typically, plants appear unhealthy, with wilted or discolored leaves that may be […]
Pieris (Andromeda): Black vine weevil categories: Ornamentals Pieris (Andromeda) Pieris (Andromeda) Insects Shrubs revision date: 2023-04-04 12:00 Black vine weevil adult and leaf damagePhoto by: A.L. Antonelli Biology Characteristic damage by black vine weevils includes irregular, ragged notching of leaf margins by adults and minor to severe root and bark damage by larvae. The adult […]
Photinia: Leaf spot (Diplocarpon) categories: Ornamentals Photinia Photinia Diseases Shrubs revision date: 2024-06-05 02:07 Photinia leaf spots and twig cankersPhoto by: J. Berger, bugwood.org Biology Fungal leaf spot of photinia is characterized by the presence of red to purple spots on the leaves. The spots are small at first, but soon enlarge and develop brown […]
Photinia: Physiological leaf spot categories: Ornamentals Photinia Photinia Diseases Shrubs revision date: 2022-12-03 12:00 Photinia physiological leaf spotPhoto by: R.S. Byther Biology Physiological leaf spot occurs on Photinia in western Washington. The symptoms resemble those of early fungal leaf spot infections. Small red to purple spots appear on the leaves, but do not develop the […]
Photinia: Powdery mildew categories: Ornamentals Photinia Photinia Diseases Shrubs revision date: 2024-06-05 10:24 Powdery mildew on photinia causing leaf curling and necrosisPhoto by: R.S. Byther Biology Powdery mildew is a fungal disease found on leaves and shoots of photinia. Characteristic patches of gray-white, powdery fungus are found in thick mats on the upper and lower […]
Photinia: Aphids categories: Ornamentals Photinia Photinia Insects Shrubs revision date: 2024-06-05 02:04 Aphid colony on leafPhoto by: A.L. Antonelli Biology Aphids on photinia are variously colored, from yellowish or greenish to black. They are soft-bodied insects less than 1/8″ long. Aphids often feed in large groups and typically are found on new growth, including both […]
Photinia: Root weevils categories: Ornamentals Photinia Photinia Insects Shrubs revision date: 2023-04-04 12:00 Adult root weevil damagePhoto by: E.P. Breakey Biology Root weevil larvae feed on the roots and bark of plants. Feeding typically occurs near the crown region. The white grubs are found in the soil around the roots. Heavy feeding by root weevil […]
Vertebrate: Rabbits categories: Vertebrates revision date: 2022-12-28 12:00 Rabbit in the gardenPhoto by: Andy Lee/Pexels.com Biology Washington State is home to several species of rabbits and hares. Most of these species have several litters each year and populations can quickly grow to damaging proportions. These animals are important food sources for most of our predators […]
Lilac: Bacterial blight categories: Lilac Lilac Diseases Ornamentals Shrubs revision date: 2024-06-05 10:24 Lilac bacterial blight (1)Photo by: J.R. Glass Biology Bacterial blight starts as brown spots on leaves and stems in the early spring. These spots become black with age and cause death of leaves and young shoots, which may bend over at the […]
Lilac: Powdery mildew categories: Lilac Lilac Diseases Ornamentals Shrubs revision date: 2024-06-05 02:03 Powdery mildew on lilacPhoto by: C.R. Foss Biology Powdery mildew is a fungal disease of the leaves. On lilac, it shows typical powdery gray-white growth on the upper leaf surface. Powdery mildew usually occurs fairly late in the season, and does relatively […]
Lilac: Lilac borer categories: Lilac Lilac Insects Ornamentals Shrubs revision date: 2022-12-03 12:00 ash borer pupal ‘skeleton’Photo by: A.L. Antonelli Biology The lilac borer, also known as the ash borer, is a member of the clearwing moth family. The adults of many clearwing moths mimic yellowjackets or paper wasps. The larvae of this moth cause […]
Lilac: Lilac leafminer categories: Lilac Lilac Insects Ornamentals Shrubs revision date: 2022-12-03 12:00 Lilac leafminer damagePhoto by: R.S. Byther Biology Leafminers feed by removing green tissue from between the upper and lower surfaces of the leaves. Symptoms of feeding by the green larvae include large brown blotches which may distort the leaves. The adult lilac […]
Lilac: Oystershell scale categories: Lilac Lilac Insects Ornamentals Shrubs revision date: 2024-06-05 08:28 Severe oystershell scale infestation on twigPhoto by: Unknown Biology Oystershell scale insects are usually found on trunks, branches, and twigs. They occur less frequently on the leaves and other plant parts. The mature scale is approximately 1/8″ long, striped with grayish and […]
Kinnikinnick: Leaf gall categories: Kinnikinnick Kinnikinnick Diseases Ornamentals Shrubs revision date: 2022-12-03 12:00 Kinnikinnick leafgallPhoto by: R.S. Byther Biology Leaf gall of kinnikinnick is caused by the same fungus which causes leaf and flower gall of azalea. Initially, infected plant parts show a thickening and then gradually become fleshy in appearance. Infected leaves and flowers […]