The maple in the front yard has yellow leaves and looks terrible. I have tried to feed iron but must be doing something wrong. Thank you for your help.
Yellowing leaves generally indicates a watering issue, to much or to little.
Increase watering and adding 2 to 3 inches of hardwood mulch can help with moisture retention.
Inspect the plants for insects or fungus.
A soil test will help you determine what is missing or may be needed in the soil.
Here are a few links for you.
https://www.gardeningknowhow.com/ornamental/trees/maple/care-of-red-maple-trees.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
I have two DNMs, each 2 yrs. old, trunk diameter 12". They were planted the spring before cicadas hit and the next summer we had a drought. Poor things! They both have long, narrow slits mainly on the branches. The trunks seem to be okay for now, although one shows bark starting to loosen and two openings are visible. I don't want to lose these trees. Is this something to be concerned about and what can I do? Thank you.
Here is a few links with more information.
https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-bark-disease.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/peeling-bark-on-trees.htm
My maple trees have black spots on the leaves. The width of the spot varies - most about width of finger tip. I'm in upstate NY. What could this be and how should I treat this?
Mine has the same thing. It can be a fungus but it is very hard spraying a tree. They are going to lose all their leaves soon anyway. But be vigilant about sanitation and dispose of the fallen leaves instead of composting them.
I have number of Maple trees, each around 4 years old. Lately their leaves have become a lot smaller with white mildew spreading out from the veins. They also have a green/yellow lichen on the branches which seems to be taking over the bark. I don't think the lichen is an issue but I am concerned that with the stunted growth it will completely cover the tree. I have 2 images if that would help you identify the problem.
Lichens and moss are generally not an issue on tree bark.
The white mold spots you discuss are likely a fungus of some kind. The fact that you have a number of trees effected can be of concern.
I would recommend a professional arborist inspect your trees for a proper identification and treatment coarse.
https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-bark-disease.htm
I have a maple tree with a fairly large empty spot. Can I cut a lower branch and graft it into the open spot so it will fill in? If so, how do I do this? Thank you!
No, this would not be possible, but you can encourage nearby branches to grow into the area. When a branch is cut, it will force to shoots to grow perpendicular to it. Think of it as a small "t". If the top of the "t" is cut, the sides of the "t" will start to grow out. Cutting the tips off branches around the empty spots will force the branches to into the spots instead of away from the tree.
I have a maple seedling that started this summer in one of my hanging baskets and I'd like to transplant in my yard.
Here is a link that will help you.
https://www.gardeningknowhow.com/ornamental/trees/maple/growing-maple-trees.htm
I have two very large maple trees that are showing bark damage both at the soil level and up the trunk. It is as though the bark is pulling itself off the tree in hunks. Maybe 20% of the tree trunk is having this problem. The layer that is now exposed is smooth, dry and gray looking. There is no insect damage that I can see. Both trees have three to four inches of mulch at the base and are in planted beds. The canopies look to be in good shape even though we have had a miserably hot, dry summer in Tennessee. A sprinkler system has kept them adequately watered. Do I wait and see what happens next or should I call in and specialist? What do you think the problem might be? Thank you for your help.
It sounds like crown rot and I would recommend bringing in a specialist for this. This can be a lethal infection for a tree if not treated properly.