Plan the perfect garden with our interactive tool →

How to Get Rid of Apple Scab

...
apple on tree image by Marek Kosmal from Fotolia.com

Apple scab is a fungal disease that affects both edible and ornamental apple tree varieties. The fungus typically develops in late summer and causes the fruit and leaves to develop green spots that eventually turn black and cause fruit loss. The spots also have a distinctive fuzzy appearance. Once apple scab develops on a tree, it is impossible to get rid of it in the same growing season. Treatment measures typically take one full growing season to completely get rid of the apple scab fungus.

Rake up all of the leaves underneath the apple tree to prevent the apple scab fungus from spreading. Although the majority of raking will occur in the fall, you should rake leaves up regularly throughout the year. In addition, collect any diseased fruit that falls from the tree as well.

  • Apple scab is a fungal disease that affects both edible and ornamental apple tree varieties.
  • Treatment measures typically take one full growing season to completely get rid of the apple scab fungus.

Place all of the collected leaves and fruit into a trash bag and dispose of it in the trash. Do not place it in a compost area since the fungus will grow.

Wait until the early spring of the next growing season,when trees are just emerging from dormancy. Place a fungicide containing lime sulfur, or sulfur into a garden sprayer and mix it with water as directed by the packaging instructions.

Watch the tree until you notice pink buds appear. Spray the limbs and trunk of the tree with the fungicide until they are saturated.

Wait until the buds open into flower blossoms, which typically occurs within two to three weeks of bud development. Reapply the fungicide as soon as the flowers open.

  • Place all of the collected leaves and fruit into a trash bag and dispose of it in the trash.
  • Reapply the fungicide as soon as the flowers open.

Reapply the fungicide two more times during the early growing season, once when the petals fall off of the apple tree and again two weeks after that.

Tip

Cornell University notes you can also use a fungicide containing copper soap during the pink-bud stage, but you should not use it for later sprayings.

Warning

Cornell also says that sulfur can be harmful to some types of apple, so ensure the varieties you are growing are compatible with sulfur treatment.

Related Articles

Common Apple Tree Diseases in Wisconsin
Common Apple Tree Diseases in Wisconsin
What Causes Black Spots on the Apples of My Trees?
What Causes Black Spots on the Apples of My Trees?
Diseases of a Flowering Cherry Tree
Diseases of a Flowering Cherry Tree
What Should You Spray Apple Trees With?
What Should You Spray Apple Trees With?
How to Grow Winesap Apples
How to Grow Winesap Apples
Orange Spots on Apple Tree Leaves
Orange Spots on Apple Tree Leaves
How to Grow Apples in East Texas
How to Grow Apples in East Texas
When Do Apple Trees Bloom?
When Do Apple Trees Bloom?
White Fungus on a Japanese Maple
White Fungus on a Japanese Maple
Fire Blight Treatment for Pear Trees
Fire Blight Treatment for Pear Trees
How to Care for Barbados Cherry Trees
How to Care for Barbados Cherry Trees
Do Apple Trees Lose Their Leaves in the Winter?
Do Apple Trees Lose Their Leaves in the Winter?
Diseases of the Nectarine Fruit Tree
Diseases of the Nectarine Fruit Tree
What Should Peach Trees Be Sprayed With to Prevent Insects?
What Should Peach Trees Be Sprayed With to Prevent...
Characteristics of an Apple
Characteristics of an Apple
Ornamental Trees in Wisconsin
Ornamental Trees in Wisconsin
The Best Fruit Trees for Kansas
The Best Fruit Trees for Kansas
Garden Guides
×