I have a dying tree near the house and need to have it cut down. Should I be concerned about the root system dying and erosion of the ground or house foundation?
No, this should not be a problem. Just make sure to plant grass or some other vegetation there in the near future so that as the root system decays, and is not able to hold the soil together, another root system takes its place in holding the soil.
I have a very young tree - less than 10 years old, around 7. The tree itself seems in good shape, but it didn't have leaves this year or most of last. Other than calling an arborist, is there something I can do to check or help it?
You can sometimes gently scrape the bark of branches and if you see green underneath, it is still alive. If it's brittle and brown, then it's dead. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/trees/tgen/what-does-a-dying-tree-look-like-signs-that-a-tree-is-dying.htm
There is sap oozing at the base of my tree. Could be caused by insects? What can be done? The tree is about 20 feet tall with large leaves in summer.
What kind of tree is it? It might be insects or it might be root gall. It could also be due to temperature fluctuations. This all depends on the type of tree. Knowing the variety of tree would allow us to give better advice on the cause and how to treat it.
I have two trees in front of my house, which faces east. The one tree is a variegated dogwood that is about 10 feet away from the house and approximately 20 feet tall. The other is unknown to me, is about 30 to 40 feet tall, and 25 to 30 feet from the house. It is constantly losing small twigs (very light in weight) and may be diseased as it is split at a 'V' in the tree. Which of these trees may leave pin-sized dots of sap on the house and cars? We live in northeast Ohio.
Probably the one that is looking diseased. It is likely not sap but rather honeydew from insects attacking the plant. This is commonly mistaken for sap and pests will attack a diseased tree.
I have several large pine trees and eucalyptus trees on the hill behind my house. The leaves and needles find there way into my rose garden and flower beds. Will this prevent them from growing well, and is there anything I can do about it?
Both pine needles and eucalyptus leaves in themselves will not hurt your plants, but both needles and leaves are known to raise the acid levels in the soil they decompose in. This will not cause a problem for your plants as long as you regularly test the soil (which should be done anyway to make sure nutrients are balanced) and treat the soil if the acid levels get too high.
Here is information on treating high acid in soil:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/lower-acid-soil.htm
I am repairing a split tree trunk by bolting the split portion to the main trunk. At the top of the split, there is an open, uncovered portion showing the trunk center. What inert material can I put in there to protect the trunk center from rain, bugs etc. until the tree grows bark over this damaged area? The tree is basically healthy otherwise.
I would gently wrap a piece of plastic over the area, but check it frequently. The biggest danger to a tree in this state is disease. Check to make sure this is not setting in and remove the plastic ASAP if you see it. Do not use tar or other permanent sealers. These can trap disease against the trunk and and you will have no way of removing it if disease sets in.
I have two trees that apparently aren't dead (says my landscaper). What is a product I can put in the base of the tree that will help it grow again?
What kind of trees are these? How old are they? And do you know what caused their decline? This information will help us to give you accurate information about the care for these trees.
As for whether or not the trees are actually dead, you can check this yourself by gently scrape the bark to see if there is any green underneath, and if so, it is still alive. If it's brittle and brown, then it's dead. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/trees/tgen/what-does-a-dying-tree-look-like-signs-that-a-tree-is-dying.htm