The new young peaches have this clear hard jelly like substance.
It sounds like you may have peach borers. This article will explain more about them: https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-borer.htm
I got an answer about borers on tree trunk, but trunk has not been affected, just the peaches have clear little balls on the fruit itself. Please help!
It sounds like you may have oriental fruit moth. This article will help you with that:
http://www.nysipm.cornell.edu/factsheets/treefruit/pests/ofm/ofm.asp
The leaves are a little brown and shriveled but still green. What can I do? The tree is about 3 years old. It is full of blooms.
You may have peach leaf curl. This article will help with that:
https://www.gardeningknowhow.com/edible/fruits/peach/peach-leaf-curl.htm
Since my peach tree has peaches this year, I put a lot of attention on it. Yesterday, I found a lot of peaches having black spots. I only saw one spot on one peach at this moment. Then I touched it; it was hard on the black spot. Some black spot areas have a slightly black substance on the peach surface. I used a knife to open it, which was a big black area inside and found a worm (just looks like a white moth larva) inside. The worm was about 1 cm long and 1/4 cm big. What is it, and how do you control it?
It is likely plum curculio. This article will help:
https://www.gardeningknowhow.com/edible/fruits/plum/plum-curculio.htm
I recently noticed that the bark on my peach tree is splitting. I had this happen to one last year and the tree died a few months later. Is there something I can do to prevent this or anything that I can do to save the tree?
Splitting most commonly occurs in freezing weather. If the wound is not weeping or splitting further, then you should just leave it alone to heal on its own. If the split is widening, you can try protective paper (sold at nurseries) to help hold it together while it heals. Do not cover the wound with tar or any other permanent substance, as this can trap disease in the wound.
I have one 3-year-old tree. It was loaded with little peaches, but they are falling off the tree. There are about 6 left now. What causes this? We do have a good bit of wind.
Sometimes fruit trees have more blossoms than they can support fruit, so a certain number of dropped fruit is normal.
I have planted 2 different peach trees. The next year they bloomed and I actually had 3 peaches on one, but for the last two years, the trees haven't bloomed at all. I trimmed the trees this Feb. so that the limbs aren't crowded. Do I need to add certain fertilizer or change the pH of the soil? Help, please. The trees are growing but not blooming. Thanks.
The trees may be lacking phosphorous or they may have too much nitrogen. Try adding some bone meal to balance things out and have your soil tested. This article may also help:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-not-blooming.htm