Leaves turning brown
Hi everyone. I'm posting here today hoping for some help from the tree experts. I have several trees on my property (sorry, don't know what kind, maybe you can tell) which have leaves which have turned partially or completely brown. In some cases I have more than one tree side by side, and one tree is affected while the other is not.
These trees are watered by my drip system. I have increased the watering by about 50% and fertilized, but haven't seen much change. One of the trees that was previously looking fine is now starting to show signs of the same problem.
I will attach a few pictures of one type of tree. The other type, Russian plum from what I understand, is having the same issue.
Also having issues with my grass as you can see in the photos, but rehab is underway and so far successful.
I looked for signs of mold, fungus, or whatever, but I don't really see anything unusual except that the leaves are turning brown, and there are small brownish red ants crawling on the trees. I'm not sure what the ants are up to - I couldn't find any other insects or specific places where the ants were focusing on.
Any ideas what the problem might be? I live in El Paso, TX.