@ Treehelp81
I'll ask you directly,as I'm curious, what made you choose this forum for advice?
and while it's a little difficult to assess from such a distance, you may find this helpful. although I would refer to a fellow countryman for a more accurate opinion.
A blackening at the base of an oak tree can be caused by several factors, including fungal infections like Phytophthora rot or Armillaria root rot, or even a build-up of sooty mold due to insect activity. Acute oak decline can also cause bleeding lesions and stem rot.
Here's a more detailed look:
1. Phytophthora Rot: This fungal disease often causes black staining on the trunk and can lead to tree dieback. Trees weakened by drought or injury are more susceptible.
2. Acute Oak Decline: This disease manifests as black, fluid-filled lesions on the stem, caused by a combination of bacteria.
3. Armillaria Root Rot: While the damage is mostly below ground, signs like dieback and mushrooms at the base can indicate this disease. Thick, black fungal strands might also be visible.
4. Sooty Mold: Aphids and other insects can secrete honeydew, which then allows sooty mold to grow, creating a black appearance on the tree.
5. Other Fungal Infections: Various other fungi can also cause blackening or discoloration of the bark.
What to do:
Consult an arborist:
If you're concerned about the health of your oak tree, it's best to consult with a certified arborist for proper diagnosis and treatment.
Improve air circulation:
Pruning infected branches and removing debris can help improve air circulation and reduce fungal growth.
Consider fungicides:
In some cases, fungicides can be effective, especially if cultural methods aren't sufficient.
Be cautious with fertilizers:
Avoid fertilizing, as some fungi thrive on nitrogen.
Address insect infestations:
If sooty mold is present due to insects, you may need to treat the tree for the insects.
this is from a quick google search.