We have received several calls from clients whose trees are dropping some leaves. Some of these are trees that we treat against the Apple Scab Fungus. It stands to reason that one might be concerned that our spray applications may not be working as well this year, but that is not the case.
Those of you who have had Tree Green treating your Crab Apple trees the past several years already know that our spray treatments work tremendously well. In the past, these untreated trees could lose up to 90% of their leaves and appear almost dead during the mid-June through mid-October time frame. Think back to those days and remember just how horrible those trees looked. Even though your trees may be dropping some leaves right now, you will not experience what you experienced before your trees were treated. But that doesn’t mean the trees will be perfect.
There are two reasons that this is happening. First, just because we treat your trees against one certain fungal problem, that doesn’t mean the tree has a protective bubble over it and that other types of fungus or blights might not attack the tree during wet Springs or Summers. There are funguses or blights that either can’t be controlled at all, or can’t be controlled with the products that we use against Apple Scab. There are all kinds of ‘additional’ pathogens that can still attack the tree. But the worst of the funguses, Apple Scab, will not cause your tree to look like it has in the past.
Second, these trees have been keeping most of their leaves during the years that we treated them for you. This causes them to be denser. Because they are denser they are actually healthier and grow much better as they absorb energy from the sun through mostly healthy leaves. But as the warm, dry summer months come, the tree realizes that it can’t sustain all those leaves so it sheds some leaves from their weaker areas. Leaves can turn bright yellow and fall, mostly from the interior of the tree where the sun has a harder time penetrating the inner canopy. This occurrence can happen to any tree, treated or not.
We have volumes of books covering the thousands of insect, fungal and blight related issues that can affect trees and shrubs. It is not necessary, or even possible, to protect against all of them. We only recommend that you protect your trees from the most debilitating of issues such as Apple Scab Fungus, Birch Borers, Emerald Ash Borer, Japanese Beetles and Scales.
So try not to get too worried about your trees if they are being treated. If we are ‘Root Feeding’ your trees every year, rest assured they are as healthy as we can make them and this rich suspension of minerals and nutrients will help them withstand most issues that may affect them.