....no one has any thoughts about what might be causing this?

Since I'm in the same zone, and water hasn't been the issue, I would look at maybe lack of nitrogen or some nutrients. My problems with squash are usually from the squash bugs, but the plants have been strong in appearance.

I re-read your post, and noticed you mentioned how you're spraying with the Miracle Gro, so forget what I said about not having enough nutrient. Maybe too much?

What sort of container are the squash in? How large?

Jim

Some of my older leaves do this and I just cut them off.
It has not affected production.

Did you check the roots for bug damage like squash vine borer, squash bugs? Any eggs on the leaves? Did you put something on it like an insecticide a few days ago or so? I did a wash on mine and leaves started to look like that, a mix of redpepper, garlic, too much soap, and a few other things like tobacco from old cigarettes.

Miracle grow can burn you plants if you made your mix too strong and if maybe even you put it on the leaves during a hot day. Maybe just fertilize in the soil? Directions might tell you different, but if it's 100 degees outside, anything is going to burn them, even plain water, making steam by the evaporating water.

I don't know what it is, but my vining butternut squashes did this all last year. I tried spraying with fungicide and tried to cut off the worst of the leaves to avoid spreading. Not sure how much good it did, but the squash plant survived and I got about 3 squash per plant, which I was ok with. Hope someone else knows what this is and the right way to fight it.

Susan

Soluble MG does NOT make a good foliar spray. It will burn leaves of many plants.

Let me clarify, I do not spray foliage with fertilizer. I feed and water only at the ground level.

The yellowing continues. They start out green and lovely and then start turning yellow.

I'm just letting them run their course. They stopped producing, but I see a ton of blooms getting ready. Most of the fruit are hollow and abort. This is not a good squash season for me. I don't think I'll try again next year.

Are they overshadowed by something? Maybe turning yellow due to lack of sunlight? Don't give up, compost over the area, but first plant some kind of green manure, maybe clover, after it's estabished in December, stack it with tree leaves you mowed over, mowing breaks them down, and next year it should be fine. Really, you should prepare a different spot though, succesional planting is the best way to control bugs. What ever area you plan to grow your squash, just try that. I did horrible with Miracle grow for the first two years, I composted over the whole area and it certainly did improve, did not fix it, but it improved it.

It could be salt in the soil? Do you live near the ocean? Runoff of salt water may be making it's way to your plant, you might try making a raised bed to keep it away.

Good luck! I hope it helps.

I also have yellowing leaves and use Miracle Gro 1/2 solution, have been experiencing alot of male flowers and female flowers, but the female flower does not open for pollination. Actually dries up and shrinks. What could the problem be?

I rotate where I plant things every year, even tho I have a small patch to garden in for veges.A green manure crop and compost seem to be all thats needed to grow everything well. Maybe you need to make a rotation plan. Once in awhile, I grow lettuce as a flower garden border, and I have grown zucchini in the flower garden also.

I'm sorry, I forgot to notice they are in containers told you how you may fix your soil. Maybe you should add about 2 inches of gravel or broken clay at the bottom of each container for better drainage.

If it rains too much, maybe it's dissolving your pellet fertilizer faster. Are you using straw inside the containers? Someone composted straw reclaimed from a barn and it killed her crop. Some kind of chemical in the straw, but don't remember what. The post was in the soil/compost forum.

Hope they are doing better.