My new squash plants are wilting. Why?
It sounds like transplant shock. This article will help you:
Can you tell me why my squash blooms like crazy and are full of small squash, but instead of maturing, they turn orange and shrivel up?
This article should help you with that: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-fruit-falling-off-the-plant.htm
Do you have any recommendations for controlling the squash vine borer organically?
I would recommend trying neem oil. It is organic, but should be effective on this pest. Here is more information:
My squash looked good at the beginning, but then they started growing bumpy and hollow. Some of the squash are smooth and are not hollow. The squash that is hollow is about 6 or 7 inches long. Please help!
A number of things could be causing this. For instance, it could be due to extremely rapid growth, usually in periods of abundant moisture after drier growing conditions. Likewise, it could be attributed to squash rot from a calcium deficiency. Pests can also be an issue, such as squash borers, which are difficult to see as they usually burrow within the stems.
Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm
My squash are really big and healthy looking but the little squash start to rot on the ends at about 2 inches long. Both yellow and zucchini are not producing.
This is known as blossom end rot and quite common. The following article should help: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm
I am growing squash and so many of my plants' stems are spittling at the base or an inch above. I don't think it is the squash borer, but I am not sure. I do not see anything in the vine, but it is yellowing and dry.
While stem split is common and usually due to extreme temperature changes and uneven watering, it never hurts to check for signs of pests, especially since they can penetrate the plant through these splits. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-pests-identifying-and-preventing-squash-vine-borer.htm
My squash plant leaves are yellowing and drying. Some have bright yellow veins on the green leaves. What's up?
Iron deficiency is normally the cause of that. Here is more information on that problem and how to fix it: https://www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm