Does My Tree Have Apple Scab?


In the past years, have your crab apple trees lost their leaves in the middle of the Summer? If yes, your trees could be experiencing the effects of Apple Scab. Here is how to identify and treat the problem:

Understanding Apple Scab

Firstly, you need to identify the fungus. If the tree is left untreated and is affected, during the Summer, its leaves will develop olive green spots, turn yellow, and fall off starting on the inside and working its way out. The tree can become up to 90% defoliated.

The good news is, Apple Scab is not deadly, but it does reduce the tree’s ability to thrive. This will weaken the tree leaving it vulnerable to other deadly culprits; such as borers or diseases. Stopping the annual cycle of this fungus will help save your tree.

4 Tips to Protect Your Crab Apple Tree

  1. Treatment – Symptoms will begin to arise at the end of June due to stress on the tree. Providing your tree with three preventative fungicide treatments between leaf out and the stress of Summer will control Apple Scab for this year.
  2.  Pruning – Keep these trees pruned will improve air flow within their branches. This will help them dry out preventing the when wet conditions that funguses love.
  3. Fertilization –  Restore your tree’s nutrients this Fall by providing them with a deep root fertilizer, this will help them come back stronger next year.
  4. Selective Planting – Planting resistant varieties of Crab Apple Trees will help you avoid the problem altogether.So, if you are looking to plant a new tree, ask your local nurseries for more details on the different varieties.

If you have any questions regarding Apple Scab or your Crab Apple Tree, please contact a Lawn Coach today!