Maple with Brown Spots
We purchased a Moonrise Full Moon Maple this spring. We noticed a few weeks ago some leaves on the upper portion of the tree were turning brown in the body (not tips) of a few leaves. They were also turning slightly yellow and brown area was dried out. The tree is planted in West Salem on the north east side of the house - within about 6' of the house. We have been giving the tree extra water these past several weeks, but there is an increase in the leaves with this condition. Please let me know if you have some ideas what this is and how to save this tree. Thank you
Polk County Oregon
Thank you for attaching an image with your question. Your maple does not have a disease. Instead, it has the side effects so common with a heatwave. The leaf has sunburn.
Continue providing additional water. Be certain to water directly onto the original rootball because the roots are still there. They started into the surrounding soil only recently. All in all, newly planted trees require regular water for their first 2 years. (The bigger the tree at planting, the longer it must be watered.) Your goal is to end up with a schedule that helps the tree thrive. For your maple, that will be a deep watering every 3 to 4 weeks through our dry months.
“Watering newly planted trees and shrubs” provides a sample schedule -- https://www.extension.umn.edu/garden/yard-garden/trees-shrubs/watering-new-trees-shrubs/.
Thank you for your quick reply. Your assistance is appreciated.