Pruning a cotoneaster in this manner is best accomplished in spring. Like aphids, they feed on the juices of the plant, and in small quantities have little to no effect. Spider mites turn cotoneaster leaves silvery or yellow, giving them a parched … Cotoneaster can be infested by both armored and soft scales. They are more easily visible through a hand lens. If you want to try cutting back cotoneaster varieties that are upright, you have more options. Dense foliage can present maintenance problems because of the difficulty of cleaning dead leaves and trash from the interior of a planting. Keep this plant from staying too wet, as rot can be a problem. The California Poison Control Center lists cotoneasters as Level 4 toxic plants. Cotoneaster hessei, sometimes commonly called Hesse cotoneaster, is a low-growing, deciduous, shrubby ground cover that rises to 18” tall but spreads over time to as much as 5’ wide.Although the Royal Horticultural Society lists this plant as a species, it is unclear as to whether the origin of the plant has … Common Name: Cotoneaster Species (Wall Cotoneaster, Himalayan cotoneaster, Entire-leaved Cotoneaster, Hollyberry Cotoneaster, Small-leaved Cotoneaster) Latin name: Cotoneaster horizontalis Cotoneaster integrifolius Cotoneaster simonsii Cotoneaster bullatus Cotoneaster microphyllus In Detail. * Family Rosaceae (Rose family) Plant identification. For best results, however, plant cotoneaster in average, well-drained soil. Plants may grow stiffly upright to 20 feet or as fountainlike arching branches. Cotoneaster Toxicity. Mites may appear, particularly in hot and dry conditions. Cotoneaster is known for handling tough conditions, including poor soil. December 2015. After about ten years I noticed some areas turned rust colour, the Some may even be groundcovers. Cotoneaster—Cotoneaster spp. I have cotoneaster as a hedge all round my front garden it was there when we moved in. The management plan for Port Eynon Point is for the removal of the cotoneaster as it threatens the site and if left unchecked could create a long lasting problem that has severely damaging ecological implications. … Trim cotoneaster that is low-growing by removing a few of the oldest branches. Problems. The overview. They also secrete honeydew, which can lead to larger problems. In the right place cotoneaster’s wildlife benefits are obvious, but in the wrong place it causes conservationists headaches. Noteworthy Characteristics. No serious insect or disease problems. If the problem started at one point and is spreading along the row then HF is a possibility. Ingesting their poisonous … Silvery, Webbed Leaves Spider Mite - Adult mites are reddish brown or pale tan and 1/150 to 1/50 inch long. These bugs, ranging from 1/8 to ¼ inch, are often mistaken for mold or fungus, since they don't really look like bugs. Mites lay their eggs on leaves and buds or at the base of plants. Cotoneaster take many forms. ... Gardener John Posts: 114. Some species are deciduous and others are semievergreen or evergreen. Rock cotoneaster shrub (Cotoneaster horizontalis) offers a nice example of a plant with four-season interest.These members of the rose family produce light-pink flowers in late spring, and their unusual branching pattern hosts glossy green leaves in summer.But rock cotoneasters really come into their own in autumn, when they … Susceptible to fireblight, leaf spots, canker, cotoneaster webworm and lacebug. Problems of Tall Cotoneaster. Still, you should always use a light hand when pruning a cotoneaster. 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