Concerns about oak trees have been common this spring. Careful observers have noticed that some of the leaves on white oak trees appear more brown than green, especially the leaves on the lower branches. Some of these leaves have even curled and fallen to the ground. The question on everyone’s mind is “Is this a serious condition or something superficial?”
Grayish brown, sometimes rounded spots often cluster around the main veins of leaves. Heavily spotted leaves can become twisted and drop off the tree, which is when the blister problem may become obvious. The blister effect may not always be clear on these spots, but the spots are sometimes raised or curved.
Composting enables gardeners to dispose of large quantities of leaves and clippings in an efficient and cost-effective way, but can they also be used for mulch? ISU Extension horticulturists share ways to use fallen tree leaves.