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APPLE SCAB
Apple Scab is a foliar disease that affects many crabapple varieties in the southeast Michigan area. As the Apple Scab spores form, lesions develop a velvety brown appearance on the leaves of the crabapple tree. As leaves age and the disease progressed, they turn yellow and fall from the tree starting in early to mid summer. In some cases, susceptible crabapples and apples may be defoliated by late June. Although Apple Scab is not terribly injurious to trees, it can give the tree an unsightly appearance. However, yearly premature leaf drop on crabapple trees does cause stress. Apple Scab is highly dependent upon weather conditions, especially temperature and humidity. With our cool, wet spring weather we anticipate that there will be some degree of Apple Scab infection on susceptible cultivars every year.
Apple Scab Control
Control of Apple Scab is achieved through a series of fungicide treatments. Fungicide applications start soon after bud break and are repeated at 2 - 3 week intervals. Removing the infected, fallen crabapple leaves can help reduce the spread of Apple Scab. However, Apple Scab is so common, and spores so readily dispersed, that infection is still likely to occur. If you have a susceptible crabapple species in your landscape it will probably need to be sprayed every year to reduce the level of Apple Scab infection.
What Else Can Help Your Crabapple
When your crabapple tree loses its leaves too early in the summer the tree loses its ability to manufacture food for itself and it puts the tree under stress. Fertilizing your crabapple and spraying, when needed, to keep the tree free of insect pests will help keep your tree as healthy as possible
Pictures courtesy of www.forestryimages.org
● Leonard
Owen Tree Service provides tree, lawn, and landscape services to the following cities and towns:
Genesee County, Michigan:
● Burton
● Davison
● Flushing
● Goodrich
● Linden
● Otisville
● Clio
● Fenton
● Gaines
● Grand Blanc
● Montrose
● Otter Lake
● Flint
● Genesee
● Lennon
● Mt Morris
● Swartz Creek
Lapeer County, Michigan:
● Almont
● Brown City
● Columbiaville
● Imlay City
● Metamora
● Peck
● Attica
● Clifford
● Dryden
● Lapeer
● North Branch
● Sandusky
● Hadley
● Mayville
● Otter Lake
● Silverwood
Macomb County, Michigan:
● Armada
● Clinton Twp
● Grosse Pointe
● Macomb
● New Haven
● St Clair Shores
● Centerline
● Detroit
● Grosse Pointe Farms
● Ray
● Sterling Heights
● Chesterfield
● Eastpointe
● Grosse Pointe Shores
● Memphis
● Romeo
● Utica
● Clinton
● Fraser
● Grosse Pointe Woods
● Mt Clemens
● Roseville
● Warren
● Harrison Twp
● New Baltimore
● Shelby Twp
● Washington
Oakland County, Michigan:
● Auburn Hills
● Bloomfield Village
● Ferndale
● Orion
● South Lyon
● Berkley
● Clarkston
● Franklin
● Madison Heights
● Ortonville
● Southfield
● Beverly Hills
● Clawson
● Hazel Park
● Milford
● Oxford
● Troy
● Bingham Farms
● Commerce Twp
● Highland
● Novi
● Pleasant Ridge
● Walled Lake
● Birmingham
● Davisburg
● Holly
● Oak Park
● Pontiac
● Waterford
● Bloomfield
● Detroit
● Huntington Woods
● Oakland
● Rochester
● West Bloomfield
● Bloomfield Hills
● Farmington
● Lake Orion
● Oakland Twp
● Rochester Hills
● White Lake
● Farmington Hills
● Lathrup Village
● Orchard Lake
● Royal Oak
● Wixom
St. Clair County, Michigan:
● Algonac
● Casco
● East China
● Harbor Beach
● Lexington
● Peck
● Allenton
● Clay
● Emmett
● Harsens Island
● Marine City
● Port Huron
● Berlin
● Clyde
● Fair Haven
● Jeddo
● Marysville
● Richmond
● Brockway
● Columbus
● Fort Gratiot
● Kimball
● Memphis
● Sandusky
● Capac
● Cottrellville
● Goodells
● Lakeport
● North Street
● St Clair
