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Joe Zeleznik, joseph.

Answer: 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.

With the rapid leaf growth that followed the recent warm temperatures, the fungal population exploded, and many ash trees began losing their leaves.

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 stumpcutting.buzzted Reading Time: 1 min. Leaves of Ash Tree are Drying Up and Falling Off. I have a young ash tree, about 8 years old. Suddenly the leaves are drying up and falling off. Looking closer at the leaves on the tree, some appear healthy, others have brown spots and others still seem to be yellowing on the edges. The other ash trees in the area seem unaffected/5(82). 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.

May 17, A disease that’s causing ash trees to lose their leaves won’t kill the trees. Many people have noticed leaves falling from their ash trees and are worried the trees are dying. They can stop worrying, according to Joe Zeleznik, North Dakota State University Extension Service forestry specialist.

Visit the International Society of Arboriculture website www.

“The leaves are falling due to a fungal problem called ash anthracnose” Zeleznik says. May 18, A flurry of green leaves falling from ash trees around town doesn't mean trees are dying. The source of the false autumn is a common fungal disease called anthracnose, according to Janelle Johnson at the Plymouth County Iowa State University (ISU) Extension office.

Johnson said she had about 35 calls from concerned residents by mid-afternoon Monday.