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Tuesday, July 18, 2017

Ash Tree Yellowing Options

Q. Hi Robert, i hope you don't mind another question, I don't know anything about this kind of tree, but we have several of the same kind in the same condition, surrounded by a variety of others seemingly healthy...They're fed and watered a lot, there's lawn under them. Does it look like it's dying?
Pictures of readers ash tree yellowing
A. Dennis.Thank you for the pictures. These help a lot. This is an ash tree but I am not sure which one.If you show someone the close-up of the leaves and they know it is growing in southern Nevada, they will assume it is an iron problem. This is because of the yellow leaves with the green veins in the close-up of the leaves. But I want to propose two possible other ideas.

Flood the area under the tree.
It could be as simple as not enough water. With limited water the tree could have yellow leaves but usually the leaves are brown or scorched around the edges. One way to find out, and it's a simple way, is just flood the area under the tree 3 times this week and again 3 times next week. See if you see a response in the growth of the tree in about 2 or 3 weeks. This is the simplest and doesn't cost you much money to do.

Add fertilizer and iron. Another possibility is fertilizer and iron. Distribute about 3 or 4 pounds of 21-0-0 under the tree along with some EDDHA iron chelate. 2 or 3 teaspoons of iron chelate in a 5 gallon bucket of water will be enough. Another possibility is to substitute about 2 to 3 cubic feet of compost along with the iron and water it in instead of the 21 – 0 – 0. Make sure the fertilizer and iron is thoroughly washed into the soil. If this solves the problem, you should see a response in 2 or 3 weeks.

Ash Decline. Is not a good one. There is a disease of ash trees called ash decline. There is nothing you can do to remedy it except to remove the tree. If you do not get a response from the increased watering and fertilizer including iron, I would conclude it is ash decline. Remove the tree and replace it with a tree that is not an ash.

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