The leaf drop is probably due to anthracnose. Anthracnose is a common fungal disease of trees in Iowa. Anthracnose may occur on ash, sycamore, maple, oak, walnut, and other deciduous trees (see encyclopedia article Anthracnose on shade trees).
Cool, rainy weather in spring favors anthracnose development. Symptoms of anthracnose vary with the tree species. Early Verticillium wilt symptoms appear in July and August. Leaves turn yellow and have a scorched or burn appearance around the edges. Leaf defoliation is more common on green ash than on other ash varieties. If leaves are falling off your green ash, and you notice the other symptoms discussed, your tree is probably infected with verticillium wilt.
Jun 07, Location. new york. Jun 2, #1. Help!! One of my ash trees is dropping it's new leaves. The leaves are green and they're dropping like crazy.
I don't remember this ever happening other years and I don't want to lose the tree. It's in the front yard and shades the house beautifully.
May 17, “The leaves are falling due to a fungal problem called ash anthracnose” Zeleznik says. “Ash anthracnose occurs every year, and this year it’s especially problematic.” The cool, wet conditions that followed initial leaf-out provided the fungus with near-perfect growing conditions.
Feb 23, It sounds as though your tree has become infected with a fungal disease called ash anthracnose. This disease attacks white ash (Fraxinus americana) and green ash (F.
pennsylvanica) just after bud break in spring. It is more severe in cool, wet weather. Symptoms often don't show up until several weeks bushfall.buzzted Reading Time: 1 min.
Anthracnose is a fungal disease that causes spots to develop on the leaves, especially the lower ones, of ash, maple, oak, black walnut and sycamore. Fortunately healthy trees can survive occasional attacks from this disease. Rake and destroy fallen leaves. Make sure the trees receive a thorough watering during extended dry periods. Plant bugs are small green insects that suck plant juices. Their feeding causes speckling and brown spots on the leaves.