Cotoneaster: Bacterial blight categories: Cotoneaster Cotoneaster Diseases Ornamentals Shrubs revision date: 2022-12-01 12:00 Biology Bacterial blight symptoms first appear in the spring (April-May) as brown spots on young stems and leaves, followed by wilted and blackened new growth. The disease is especially favored by wet conditions. Infection often occurs at injury sites, such as those […]
Cotoneaster: Fire blight categories: Cotoneaster Cotoneaster Diseases Ornamentals Shrubs revision date: 2022-12-01 12:00 Cotoneaster fire blightPhoto by: R. Maleike Biology Fire blight is a bacterial disease which initially infects via flowers. Common symptoms include watersoaked spots on the bark, cankers at the base of affected twigs, and droplets of a dark bacterial ooze on the […]
Cotoneaster: Scab categories: Cotoneaster Cotoneaster Diseases Ornamentals Shrubs revision date: 2022-12-01 12:00 Apple scab on leaves and young fruitPhoto by: R.S. Byther Biology Symptoms of scab on cotoneaster are similar to those on apple. A fungal disease, scab causes leaves and fruit to develop dark or black blotchy spots. Initially, the leaves show pale pinhead […]
Cotoneaster: Cotoneaster webworm categories: Cotoneaster Cotoneaster Insects Ornamentals Shrubs revision date: 2023-12-02 09:17 Cotoneaster webworm damagePhoto by: C.R. Foss Biology The cotoneaster webworm is a dark brown caterpillar, 1/4″ to 1/2″ long. It typically ties clumps of leaves together with webbing and feeds within the nests, skeletonizing leaves. The caterpillars feed during the summer and […]
Cotoneaster: Spider mites categories: Cotoneaster Cotoneaster Insects Ornamentals Shrubs revision date: 2022-12-01 12:00 Spider mites under microscopePhoto by: L.K. Tanigoshi Biology Spider mites are tiny, eight-legged, and of various colors from yellowish to dark to red. They may be found on the upper or lower surface of leaves and often produce a fine webbing on […]