Crab Apple Trees – Fungus

We mentioned that we expect fungal issues to be extensive this year in the Western suburbs. We are certain of that. For those of you whose Crab Apples we treat for Apple Scab, we know you will be happy with your decision to treat your trees. You will realize just how glad as the Summer progresses and you see other area Crabs missing 70% to 90% of their leaves in July, August, September and October.

Keep in mind though that a new fungus hit the area in the past few years called ‘Frogeye’ Fungus. This fungus is different and not nearly as debilitating as Apple Scab. It may create bright yellow spots on the leaves initially and the tree may then drop some bright yellow leaves onto your lawn. This situation too will last a few weeks and then stop. This occurrence happens early enough in the Summer that the trees will still have a chance to re-foliate. It is not anywhere near as harmful as Apple Scab which creates dark brown and black lesions on the leaves. Our Apple Scab products are not labeled for Frogeye. There is a limit to how many products we can mix together and there is no single product that controls every potential fungus that is out there. We focus primarily on Apple Scab which does the most harm by far.