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Crabapple Tree Diseases

Botryosphaeria Canker

Botryosphaeria Canker
  • Symptoms

    • Leaves on infected branches wilt and die. Branches die back and become covered with dark-brown to black, pimple-like fungal fruiting structures. Wood under the bark is dark brown.
  • Management

    • Trees most susceptible are those under drought stress. Be sure to water the plant to prevent drought stress. Prune infected branches.

 


Fire Blight

Fire Blight Canker slightly sunken
  • Symptoms

    • Infected flowers are killed and often remain attached throughout the season. The ends of twigs and branches become brown or black and may curl into a shepherd's hook shape. Dead leaves may remain attached to the tree. Cankers formed the previous season may ooze a cloudy liquid during wet spring weather. Branches will be killed as slightly sunken cankers enlarge into larger branches and even into the main trunk.
  • Management

    • During dormancy when the weather is dry, prune infected branches, cutting at least 4 inches below the base of the canker. Disinfect pruning tools after each use. Fertilize carefully to avoid promoting excessive succulent growth. Remove root suckers and water sprouts while they are small. Apply ZeroTol Fungicide Bactericide to help control and eliminate Blight.

 Fire Blight Resistant Crabapples:

Adams, Callaway, David, Dolgo, Harvest Gold, Indian Summer, Jewel Berry, Liset, Profusion, Red Baron, Selkirk, and Sentinel



Scab

  • Symptoms

    • Dull, Olive-Green, velvety fungal growth develops on the surface of leaves in the Spring. Leaves yellow and fall prematurely, giving the tree a thin, bare appearance by mid-season. Infected fruit have circular, rough spots on their surface.
  • Management

    • Grow resistant cultivars. Rake and destroy fallen leaves and fruit. Apply propiconazole + chlorothalonil as flower buds begin to show color and again 3 weeks later.

Scab Resistant Crabapples: 

Adams, Baskatong, Brandywine, Callaway, David, Dolgo, Donald Wyman, Malus floribunda, Henry Kohankie, Henningi, Jewel Berry, Ormiston Roy, Professor Sprenger, Malus seiboldi var. zum cultivar Calocarpa, Silver Moon, Sugartyme, Malus tschonoski, Weeping Candy Apple, & White Angle

 

Apple Scab
Apple Scab


Cedar Apple Rust

  • Symptoms

    • Bright Yellow or Yellow-Orange spots form on leaves. On the upper surface of the leaf spot, small, black fungal fruiting structures form. Later, clusters of cup-shaped structures with fringed edges can be observed on the underside of the infected leaves.
  • Management

    • Remove unwanted Junipers growing near crabapples. Do not plant Junipers close to crabapples. An effective way to control Rust is to apply AllGuard Organic Spray. BUY NOW!
Cedar Rust on Upper Leaf
Cedar Rust on Lower Leaf


Frogeye Leafspot

Frogeye Leaf Spot
  • Symptoms

    • Small distinct spots with purple margins form soon after the leaves unfold. Old spots become gray with a concentric pattern within them. Leaves yellow and fall.














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