I have a very beautiful maple in my backyard. It's been flourishing nicely for the past 6 years, but suddenly a limb fell off and during the course of the summer, some of the branches went into an early fall, with the leaves changing colors and falling off. Now that fall has arrived, we have had strong showers and there are a lot of mushrooms growing on the bark, in addition to the bark shedding. Can I save the tree?
It sounds like an infection of some kind got into the wound when the branch fell. The tree may have rot inside, which would explain the bark and leaves. Without being there, we would not be able to help you diagnose the tree properly and recommend a course of action. We would recommend that you bring in an arborist or other tree specialist to look at your tree and give advice.
I have an area of about 40' x 60' that is shaded by a couple large maple trees. Also, most of this area is extremely wet in the spring time, or when we have a lot of rain through the summer. In fact, I often have standing water over much of the area.
It is likely that grass will not grow in those conditions. I would consider creating a rain garden to help drain off the standing water (https://www.gardeningknowhow.com/special/spaces/rain-garden-design.htm) and then once the area is drier, plant a shade tolerant grass (https://www.gardeningknowhow.com/lawn-care/lgen/shade-tolerant-grass.htm)
These articles may also help:
https://www.gardeningknowhow.com/lawn-care/lgen/growing-grass-shade.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/tips-for-growing-grass-under-a-tree.htm
Tile area first to promote proper drainage, next make sure that your problem isn't from shallow root system from your trees depriving grass of vital nutrients.
If your trees are the problem than you probably will not be able to grow grass without removal or thinning of your trees to allow sunlight in.
If this is not an option have a soil test done to determine PH
Plant a shade tolerant grass
There are patches of grey/white on the bark of my Norwegian maple (Crimson King). Is it likely to be a fungal infection or mildew? It will not wash off easily but can be scraped off with nail.
It sounds like the plant just has a lichen. It is not harmful to the plant. Here is more information:
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm
Will a young maple that has been damaged by voles regenerate new bark? What can be done to help the tree heal?
As long as the tree has not been girdled (bark loss all the way around the trunk) it can recover. It is best to leave the tree as is and let it heal on its own. Here is more information: https://www.gardeningknowhow.com/ornamental/trees/tgen/repairing-tree-bark-damage.htm
Metal edging was installed when maple tree was young. The tree has grown into the edging. Should I remove the edging? How should I repair the damaged bark?
I would not attempt to remove the edging from the tree at this time. I would remove any of the edging that has not yet become embedded in the tree, but leave what is embedded in the tree alone. You will do more damage than good by removing it from the tree's trunk tissue. Eventually, the tree will simply completely surround it and you will only see a bit of a disfiguration.
We have had a large buck deer come through our front yard this past winter/spring regularly. The deer decided he liked our little red maple tree to rub on. The bark has been damaged about three feet long and a third of the way around the tree, which is about four inches in diameter. What should we do to help the tree heal?
The following articles should be of some help to you:
https://www.gardeningknowhow.com/plant-problems/pests/deer/how-to-protect-trees-from-deer.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/repairing-tree-bark-damage.htm
Our Red Sunset maple dropped a lot of seeds this spring. Now the leaves look very sparse on the tree. We want to give it a lot of water but don't know how. Do we need a large pattern of spray? Do we water the dribbles into the root area? Do we spray a large area of the roots close to the ground?
Water close to the ground and in the full area that is below the canopy of the tree.