A community effort is needed to treat this problem on a mass scale, to retain these beloved Cotoneaster shrubs that adorn our beautiful city. A low-growing, prostrate shrub densely blanketed with small, lustrous dark green leaves, and accented with a showy profusion of small white blooms in spring and large red ornamental berries in fall that persist into winter. As marvelous as all of that is, we also have our very own assortment of tree diseases. H H Adobe_CM Adobed J " ? The oystershell scale insect is spreading through cotoneaster — a plant widely used in Calgary for hedges, shrubs and bushes. Prune cotoneaster shrubs any time of year. Considering the oyster shell scale epidemic in Calgary, perhaps the hedge use of cotoneaster will drop off. I was told to cut this out then plant small cuttings which were at the base of the hedge which I did, Maybe you will spot some under … By submitting a comment, you accept that CBC has the right to reproduce and publish that comment in whole or in part, in any manner CBC chooses. continued next page Robert Vidéki, Doronicum Kft., Bugwood.org Last Updated December 2016 abinvasives.ca info@abinvasives.ca Alberta Regulation: Unregulated abinvasives.ca info@abinvasives.ca Dow Gardens , Dow Gardens, Bugwood.org Overview: Cotoneasters are perennial, woody shrubs which generally have a prostrate growth … Pseudonyms will no longer be permitted. Many are the people who have cut their old hedges to … Cotonester acutifolius; Zone 2 (-46°C) Mature size: 6' tall x 5' wide; Full to part sun - 4-6 hours of sun each day; Specifications. Keeping your garden, including all plants, shrubs and trees healthy, watered and happy is your best first defence. Growing from a woody stem this will not become invasive – a common concern with groundcovers. Cotoneasters with healthy root systems will quickly re-grow. The most common problem with cotoneasters is mites. CBC's Journalistic Standards and Practices. Oystershell scale is considered a serious pest on Cotoneaster shrub- which is a popular choice for hedges in our city. We reserve the right to close comments at any time. © 2021. Very disease and pest resistant. Find out more... Telephone consultations. Usually cold and rain will slow it down," he said. "You're basically doing a little amputation and sterilizing your tools.". Fire Blight is a serious disease of nearly all members of the Rosaceae family--some more than others and the effects on the subject plants also vary. Disease; Hedge Cotoneaster is recommended for the following landscape applications; Mass Planting; Hedges/Screening; Planting & Growing. Oystershell scale affects 120 species, many of which grown in Calgary — such as lilacs, hawethorn, green ash and crabapple trees. Updated: July 31, 2016. Oystershell scale is becoming an increasing problem in the calgary area with entire hedges completely … Several branches have crispy, reddish brown leaves that appear to be dying. This stage only lasts for a week to ten days, so it’s important to act quickly: ​​​Learn more about tree pests and diseases in Calgary​. ensemble Cotoneaster hedge diseases!!! Save For Later Print. That's the armor that those little bugs hide underneath," said Hannah. Fire blight is also deemed a pest under Alberta's Agricultural Pest Act. The pest only reproduces once per year, with the egg hatch occurring in early to mid June over about a ten-day period. A classic sign of fire blight on cotoneaster is when the plant's branches and leaves die back. It can ravage Calgary’s urban forests during humid and warm summer weather conditions. Oystershell scales suck the fluids of cells underlying the bark, often killing the cells at the feeding site. "The bugs suck all the juices out of the plant," said Corinne Hannah, a horticulturalist at the Calgary Zoo. The best defence is to keep up on yard maintenance and inspect your plants for any signs of pests on a regular basis. Les agents d’Immigration Canada font preuve d’une grande vigilance et refusent l’entrée sur le territoire en cas de doute sur le motif du séjour et la probité des voyageurs. "If you drive through Inglewood, virtually every hedge is dead," said Keegan Seward, owner of The Arborest Expert Tree Service. It is a priority for CBC to create a website that is accessible to all Canadians including people with visual, hearing, motor and cognitive challenges. This pest only reproduces once per year, with the egg hatch occurring in early to mid June over an approximate ten day period. Box 500 Station A Toronto, ON Canada, M5W 1E6. Oystershell scale is an introduced pest in Calgary. Infestations are affecting every part of the city, leaving no neighbourhood untouched. Once hatched, the “Crawlers” feed on fluids found in the twigs and branches; they then permanently attach to the branch, developing a hardened shell that protects them from predators, the elements and most pest-control methods. Most types only need light pruning to remove wayward branches or to control disease. Cotoneaster Aphid, Woolly Scale, Oystershell Cotoneaster Webworm Entomosporium Leaf Spot Leaf Crumpler Sawfly, Pear (“Pearslug”) Spider Mite, Twospotted Uglynest Caterpillar Fire Blight Borer, Roundheaded Appletree Generally, fire blight is very rare in Calgary since our summers are usually too cool and dry for disease development. Once hatched, the “Crawlers” feed on fluids found in the twigs and branches; they then permanently … Cotoneaster congestus. When Oystershell scale eggs hatch, and become “crawlers” they are most vulnerable to treatment methods. Apply a Horticultural Oil (this helps suffocate the “shells”). But if it's really bad, you're going to have to mow that hedge down and spray the stumps. Black knot tree fungus erupts in Edmonton. Hedge Cotoneaster will grow to be about 8 feet tall at maturity, with a spread of 6 feet. Genus of more than 400 species of deciduous, semi-evergreen and evergreen shrubs and trees from woodland and rocky areas in northern temperate regions of Europe, Asia and northern Africa. It's important to act early in the infestation progression as once you can easily notice it, the infestation is usually quite severe. The flowers appear in summer, and can range from pink to white. As of late 2015, the owner of another tree service in Calgary told me that … Less common upright types of cotoneaster feature all the same characteristics but can be traine… Fruit trees, lilac, ash, maple, dogwood, poplar, and willow. Branches die back and … "It's not naturally being slowed down by weather. Cotoneaster horizontalis is a short shrub with a spreading habit, growing to 1 metre (3 ft 3 in) tall by 1.5 metres (4 ft 11 in) wide. The oystershell scale insect is spreading through cotoneaster — a plant widely used in Calgary for hedges, shrubs and bushes. Inspecting plants that are prone to Oystershell is a good preventative measure. He says now is the time to take action because the babies, called "crawlers," are about to hatch and have not developed their protective armor. Generally, fire blight is very rare in Calgary since our summers are usually too cool and dry for disease development. Comments on this story are moderated according to our Submission Guidelines. Appointments. Seward is not a fan of pesticides, but says if you don't bring in the "big guns" the oystershell scale will just crawl back up the new growth. Get Coronavirus (COVID-19) updates and information on closures, cancellations and service changes. If you are concerned about the health of Cotoneaster … Hedge Cotoneaster will grow to be about 8 feet tall at maturity, with a spread of 8 feet. Fire blight is a serious bacterial disease affecting trees and shrubs in the rose family. Disease; Hedge Cotoneaster is recommended for the following landscape applications: Mass Planting; Hedges/Screening; Planting & Growing . We hosted the Winter Olympics in 1988, we have one of the largest libraries in Canada, and our own Glenbow Museum is also one of the largest in Western Canada. Calgary is currently experiencing a mass die-off of Cotoneasters due to this pesky insect. After about ten years I noticed some areas turned rust colour, the leaves then fell off leaving dead patches..I was told its fire blight a fungal disease. Managing Oyster Shell Scale Insects. Because this is a very infectious disease, it is important that effective control measures be undertaken … "It's ugly. It's an oozing, ugly mess," said Hannah. Hannah says you can treat it by using 10 per cent bleach on pruners and cutting the hedge to 30 centimetres past the affected area. Natural pest control: ladybugs (lady beetles), lacewings and other natural predators are helpful in controlling outbreaks. It has the appearance of tiny brown to gray oyster shaped scales, usually densely packed, that cover bark on shrubs and trees. Cotoneaster Cotoneaster spp. It is cultivated for its flat, symmetrical sprays of glossy green, deciduous leaves 6 to 12 mm long and masses of bright red berries in autumn, persisting into winter. According to the City of Calgary, homeowners are responsible for keeping it under control on their own property. Specifications Dimensions Assembled Depth (in inches) 10 Assembled Height (in inches) 27.5 Assembled Weight (in lbs) 12 Assembled Width (in inches) 10.5 Packaged Depth (in inches) 10 Packaged Height (in inches) … In last few years, the cotoneaster hedges in Calgary are severely infested by Oystershell scale which causes die back of the hedge and makes dead patchy spots. 3 ! It has the appearance of small clusters of oyster-shaped “shells” that cover bark on shrubs and trees. It is commonly grown … Comments are welcome while open. Calgary's habitat management superintendent, Lincoln Julie, is aware of the problem and is "currently assessing city trees and developing a treatment plan.". It tends to fill out right to the ground and therefore doesn't necessarily require facer plants in front, and is suitable for planting under power lines. As the spots spread the leaves and stems become covered in a white puffy substance that causes the leaves to turn yellow and fall off. Cotoneaster Diseases; Cotoneaster Diseases. There are two species of moths with caterpillars that can cause defoliation of Cotoneaster horizontalis and some other plants.The affected parts of the plant are covered in silk webbing produced by the caterpillars and the leaves turn brown as they are grazed. Low-growing, spreading varieties of cotoneaster work well as woody groundcovers. "If you look on the branches closely, you'll see all these little bumps and ridges that look kind of like oyster shells. It tends to fill out right to the ground and therefore doesn't necessarily require facer plants in front, and is suitable for planting under power lines. If the oystershell scale has only hit a small area of your cotoneaster, Hannah says you can spot treat it with insecticidal soap. Cotoneaster definition: any Old World shrub of the rosaceous genus Cotoneaster: cultivated for their small... | Meaning, pronunciation, translations and examples If this one dies it will ruin my landscape if I replace it with a new much smaller cotoneaster. It can ravage Calgary’s urban forests during humid and warm summer weather conditions. Cotoneaster 'Cranberry' Cotoneaster apiculata Zone: 4 Exposure: Full Sun to Partial Shade Mature Size: 3' H X 5' W Tree Form: Dense, rounded Foliage It has the appearance of small clusters of oyster-shaped “shells” that cover bark on shrubs and trees. Sun Exposure: Full Sun. Fireblight is a destructive disease that attacks more than 75 different species of plants, all of which are in the Rosaceae family. The disease is called black knot, and it infects trees in the prunus family. Cotoneaster lucidus Zone: 2 Exposure: Full Sun to Partial Shade Mature Size: 8 H X 5 Tree Form: Dense, upright Foliage Color: Shiny green Growth Closed Captioning and Described Video is available for many CBC shows offered on CBC Gem. These pests suck plant … He says the bug has been infiltrating other riverside communities, such as Douglasdale and Riverbend, for the last five years — but is ramping up all over the city because of the warm and dry spring. Seward says fire blight is not as prevalent in Calgary right now as oystershell scale, but it's still a problem. Look for branches with oyster-shell shaped bumps, leaves that are turning yellow, and branch dieback or gaps in your hedges. Entire streets have lost their cotoneaster hedges in some neighbourhoods. Under the authority of the Medical Officer of Health, the program is responsible to prevent and control communicable diseases (CD) that are defined as Notifiable, under the Communicable Disease Regulations of the Public Health Act of Alberta. If left unpruned, a single plant will in time make an amazing five-metre ball. Notifiable Disease and Outbreak Management. ‘Eichholz’ cotoneaster (Cotoneaster dammeri ‘Eichholz’). These can become large plants. To encourage thoughtful and respectful conversations, first and last names will appear with each submission to CBC/Radio-Canada's online communities (except in children and youth-oriented communities). This fast growing evergreen shrub only grows 10-12” tall but can spread 8-10’ yet is easy to chop indiscriminately when you feel it has gone far enough. To keep the plants looking neat, cut out selected branches all the way to the base rather than shearing or shortening them. Once dead patches are easily spotted, pruning out affected stems or cutting the entire hedge to ground level is the most effective control. An air-borne fungus is infecting thousands of trees in Calgary. Oystershell scale belongs to a group of insects called the armored scales and is an introduced pest in Calgary. If you would prefer not to come into the surgery for an appointment you can book to have a Telephone consultations with a doctor or … Such plants typically feature stems that arch, cascade, and even grow horizontally. Symptoms of infestation don’t usually show up until your shrub or tree is heavily infested, making this a difficult pest to fight. This pest only reproduces once per year, with the egg hatch occurring in early to mid June over an approximate ten day period. When these stems touch the ground, they often root. Oystershell scale is an introduced pest in Calgary. They’re small in size, but when large in numbers oyster shell scale insects can wreak havoc on many of our trees and shrubs. Informational table showing disease name, symptoms, pathogen/cause, and management of Cotoneaster diseases. Family: Rosaceae (ro-ZAY-see-ee) Genus: Cotoneaster (kot-on-ee-ASS-ter) Species: congestus (kon-JES-tus) Synonym: Cotoneaster microphyllus: Synonym: Cotoneaster pyrenaicus: Category: Alpines and Rock Gardens. However, severe thunderstorms and hail can lead to an outbreak of fire blight. Articles. Fire blight is a serious bacterial disease affecting trees and shrubs in the rose family. A superior groundcover for banks, berms, and other areas where a quick, … It grows … At this point the other two plants do not seem to be affected. Cotoneaster is the preferred host, but we have now seen it infesting crabapples, apples, hawthorn, mountain ash, green ash, common lilac, yellow-twig willow, saskatoon, dogwood, amur cherry, and ‘Schubert’ chokecherry. 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