Maples are one of the most popular trees in Barton County. They give fabulous color in the fall, interesting bark in the winter, and overall is a good tree for this area. On the K-State Research and Extension list of recommended trees, 4 different varieties of Maple are listed for Central Kansas. So, why do I get so many phone calls about health issues with them? I think it is for a few reasons. First, because they are so beautiful and highly recommended, we have a lot that have been planted over the years in our communities. Second, they are sensitive to high pH soils and can have difficulty extracting enough iron. Because of this, they are one of the first trees to show signs of Chlorosis, especially when their roots systems have been damaged by severe drought. Right now, there have been reports of scorch also showing up on Maples. To try to help, I found an article from KSRE’s Horticulture expert on this new issue showing up with our beloved tree.
Leaf scorch is starting to show up primarily on maples around the state. This is not a disease but rather a physiological problem associated with damaged roots, storm damage, limited soil area, or hot, dry winds.
Moisture is lost so quickly from the leaves that roots can’t absorb and transfer water quickly enough to replace what is lost. Though scorch is usually associated with droughty periods, it can appear even when the soil is moist.
Scorched leaves turn brown or, in some cases, turn black from the edges and between the major veins. If severe, the leaf may drop. Leaves may be affected over the entire tree or may be affected only on one side. White pines are also prone to this condition due to the delicacy of the needles.
Though scorch can be due solely to the weather, the condition of the roots of plants can make them much more susceptible to this condition. Shallow soils such as those over hardpan or rock lead to a limited root system that may not be able to absorb all the water needed. Trees may be more sensitive to scorch this year because of the heavy rains some areas received in June. Though soils were recharged, in many cases so much rain was received that oxygen was driven from the soil resulting in root damage. That root damage is now making it more difficult for trees to provide all the water needed for the leaves. Also, root damage due to disease, insects, poor drainage or construction can cause poor water uptake.
To help alleviate damage due to dry soils or limited root systems, water once per week for recently transplanted trees of every two weeks for large trees if there is no rainfall. Mulching small trees or shrubs will help conserve moisture.
Alicia Boor is the Agriculture and Natural Resources agent for Barton County K-State Research and Extension. You can contact her by e-mail at email@example.com or calling 620-793-1910