Just the leaflets are coming down.
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. 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 treeremove.barted Reading Time: 1 min. Jun 07, Ash have compound leaves, which means each leaf has a number of leaflets.
Joined Jun 2, Messages 12 Location new york.
Which was another question, are the whole leaves falling or just leaflets? Look very closely at the leaves, especially where they disconnected from the tree, for some kind of abnormality.
Ash Leaf Drop. Leaf drop of ash trees at this time of year (mid-late May) is usually caused by a fungal disease called ash anthracnose. The problem occurs on susceptible ash species (especially green ash) in extended periods of cool, moist weather.
Similarly, what is wrong with my ash tree? Ash Tree Diseases with Leaves Dropping Ash Yellows. A major disease problem facing ash tree growers is ash yellows, a disease cause by a microorganism called Verticillium wilt. Verticillium wilt is caused by a fungus living in soil that infects tree roots and then spreads to Ash Anthracnose.