I've been researching this for several days and my conclusions
are...inconclusive. Some sources say that this yellow vein problem IS a
symptom of oak wilt, others suggest it may be a nutrient deficiency or a
symptom of a different disease. All sources state that I should see leaf
death from the tips toward the stem, which I'm not seeing on my tree or any
of the few other oaks in the neighborhood. So I'm confused, to say the
least. Until I read the sample requirements for the A&M testing service I
was ready to go with that, but to provide adequate material I'd have to send
them the entire tree!

We've got some mechanical damage (every tree in our neighborhood does, we've
got cutter ants or something, even the laurels are pretty tatty), obvious on
the leaf I'm using as my example.

Tree history:

We planted 2, 10-gal southern red oak saplings approximately 6 weeks ago.
The trees came from the same nursery. We heeled them into holes approx 5'
in diameter and 3' deep; each hole was bottom-padded with composted cow
manure and topsoil since we're on caliche less than 6" from the surface. We
added no other fertilizer of any sort. Until last week when the monsoon
season started we've been watering the trees every three days at the rate of
200 gallons each watering. The trees are approx 25' apart.

The northerly tree is doing fine and putting on new growth.

I noticed this yellow vein problem on the southerly tree about two weeks
ago. All leaves on the tree are affected. I have checked the tree daily in
the two weeks since I noticed the problem and have seen little to no new
growth during that time. I do see leaf buds but they are not swelling and
are definitely not opening and leafing out.

I have asked the neighbors on both sides if they have put down weed&feed or
any other lawn chemicals in the past month - negative replies in both cases.
Our lawn spreader is full of spider nests and plenty of cobwebs, indicating
my husband hasn't put anything down either.

Any suggestions as to what this may or may not be will be helpful.

Thanks!