Tree diseases can cause superficial and deadly damage to your landscape plants. Get answers to common questions about tree diseases in this section.

Tree Diseases FAQs (89)

  1. What should be done about tall evergreens that are infected with orange gelatinous globs?
  2. I have four scrub oaks on my front lawn. A few years ago we had a drought here in Colorado and many of the roots of these trees came to the surface. They are now beginning to take over a beautiful lawn. Cutting them back doesn't help as they only grow back through the grass and with so many it's almost impossible to keep up. Is there any method I can use to kill the roots at the surface of the lawn without killing the entire tree? Any help is greatly appreciated.
  3. I have a question about a 75-80 year old ginkgo tree that is located at my father’s insurance office. About 1 1/2 months ago, electricians were trenching for underground utilities about 4-5 feet from this tree and cut about 4-5 large roots. Some of these were 6-7 inches in diameter. We are concerned that this may kill the tree. So far we haven't noticed any stress on the tree. Is there anything we can do to help the tree? Do you think this will cause the tree to die?
  4. Are black tar spots on maple leaves harmful to the maple tree?
  5. We have a tree in our backyard that was planted ten years ago and has a diameter of 8". Our dog has chewed on the tree and left a number of marks in the bark. In one place, he chewed through the bark. Do I need to treat those areas and/or wrap the trunk?
  6. I am having two neighboring maple trees, about 40 feet tall, removed to make way for a septic leach field. It is an optional removal. They will not be able to be excised once the delicate piping etc. will be put in. Will I have more standing water on the ground now that the trees and roots are not there to use excess water? The trees are about 20 feet from the house.
  7. I have two 5' emerald cedars which I bought to complete a hedge. I planted them in a temporary spot in the garden and one of the trees looks like it is dying from the inside out. It is turning brown in places. I have put it back into a pot with good drainage and good soil. Is there anything else I can do to help it come back to life?
  8. I have an old redwood tree that is over 100' tall. I was going to put a planter at the base of the tree. My neighbor told me that if I put the planter at the base of this tree I will probably kill it. The planter was going to be three blocks high and I was going to put dirt from the blocks to the trunk of the tree. Is my neighbor right?
  9. What kind of injection or injections should I use for a live oak that's 200 to 300 years old?
  10. If I plant a tree where a stump has been grinded out, does that raise the possibility of honey fungus killing off my newly planted tree?
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