I have just noticed brown jelly fungus on my red oak tree. It is at the base. I am wondering if I can treat this or do I need to call a professional arborist. Pic attached.
The jelly fungus itself is not harmful to your tree, but it is a sign that the tree is sick or dying. These fungi only begin to grow once a tree is rotting due to other health problems. As this article explains, it's best to consult an arborist:
https://www.gardeningknowhow.com/ornamental/fungus-lichen/jelly-fungi-on-trees.htm
There are many tree roots that have extended into the flower bed and we are trying to identify which tree they are coming from. The roots are coated with a thin red bark. Nearby trees (between 10 and 30 feet) from the garden are pine, crape myrtle, and oak. Do you know which tree the roots may be coming from? Thanks for your help.
Pine Tree roots can travel 2 to 3 times the width of the drip line.
Pine Tree's are known to have invasive roots and most of the roots are within the top foot of the surface.
A Crepe Myrtle root system in fibrous and close to the surface.
Oak Tree roots have a tap root and the majority of roots lie within the top 18 inches of soil. The roots can occupy the space 4 to 7 times the width of the trees crown.
My best guess is that you are seeing the Pine Tree roots.
Best time of year to straighten, late fall or early spring?
Either time of year should be fine. Here are some options for how to do it:
https://www.gardeningknowhow.com/ornamental/trees/tgen/straighten-tree.htm
Reading the following link about tree stump removal or killing a tree, suggests using rock salt. Won't the salt affect the ground around the tree stump after decay or during decay? Will the salt affect other plants growing in the area? https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-stump-removal.htm
Yes, it is possible for the salt to effect, damage or kill the grass around the stump.
These effects may be corrected after the stump has been removed.
We had a hard freeze here in Houston, Texas - zone 9. I trimmed the tree, but all the leaves are falling off of the tree, and what is left of the leaves are turning yellow and falling. I would assume it is dead, and that I probably need to plant another tree. Thank you.
Your tree might still be alive, even if it loses all its leaves. It is difficult to tell how severe freeze damage is until the following spring. Your best option is to wait until next spring and see whether the tree puts out leaves again.
If leaves grow on some parts of the tree but not others, and it's clear that some branches are dead, you can prune off the dead branches. Here is how to tell whether a tree is completely dead:
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-scratch-test.htm
I have noticed several trees around our area (Wodonga, Victoria, Australia) that have lumps growing on them (see photos) and it seems to suck the tree dry and finally leave them dead and/or dying. I'd like to find out what it is so I can do something to stop its progression. Someone suggested it may be the loss of a natural predator that would normally eat the disease off the tree but I don't know what that might be. Any information would be helpful, as I want to save as many trees as I can. Obviously, I have tried Google who knows everything but I haven't been able to find the answers - yet.
We did not receive the images.
What types of trees are affected? Researching a particular trees diseases can be helpful.
Without pictures and this description is sounds like a crown gall infection.
http://www.dpi.nsw.gov.au/agriculture/horticulture/pests-diseases-hort/multiple/crown-gall-of-plants
I have a mature coral tree that for the first time ever failed to bloom and then had no regrowth of any leaves- It's February and just bare branches. Other local trees all look healthy. We live in farmland, and it's surrounded by a viburnum hedge.
Depending on where you live, the coral tree could have been damaged by cold during the winter if it is less winter-hardy than most other trees in your area. Or, it could just be late in leafing out this year- see the following article:
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-leafing-problems.htm
Another possibility is that a disease or heavy insect infestation has damaged or killed your tree. Did you notice any unusual insect damage or leaf loss last year? Please see the links on the right side of the following page for some diseases and insect pests that may be a problem. Verticillium wilt is a possibility, because it can kill whole trees:
http://ipm.ucanr.edu/PMG/GARDEN/PLANTS/coraltree.html