Sorry, I guess the picture didn't post. Let's try again.

Anyone got any ideas?

I try to examine the leaves regularly for SVB and squash bug eggs, and have pulled a few SB eggs off the leaves. I occasionally see cucumber beetles in the garden, but they are gone before I can do anything about them.

I have sprayed several times with pyrthrin/rotenone and plan to give a good neem oil spray tomorrow.

You can't tell from the picture, but that is one vine. It's the leaves closer to the stem that are turning yellow. The ones farther out seem to he healthy.

My wife put some straw around the stem to mulch the plant. I pulled that off today because I got to thinking that the problem started right after we did that.

At the time I posted this, there were no SVB yet. However I do agree that SVB, along with cucumber beetles (both striped and spotted), and squash bugs can do a number on your plants. I hand picked squash bugs and their eggs from the leaves all season, so hopefully the population will be smaller next year.

I decided, though, that my problem was the soil. I cleaned out a drainage ditch and I assumed that the soil would be rich from silt and decayed plants from the past. It turns out that the soil had the nitrogen leached out of it and, when I gave the plants some nitrogen, they greened up and I got quite a few squash from them.

Now, on to next year...