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As explained in the following article, the most effective time to spray is just after the leaves have fallen in the fall, and again during the budding period:

http://ipm.ucanr.edu/PMG/PESTNOTES/pn7426.html

The article also discusses effective fungicide products for this disease.

Bacterial leaf spot caused by Xanthomonas campestris could cause the oozing gum on the surface of your fruit. Check for spots, holes, and discoloration on the leaves, as in the following article:

https://extension.psu.edu/plants/gardening/fphg/stone/diseases/bacterial-spot

This article might also help you:

https://www.gardeningknowhow.com/edible/fruits/apricots/apricots-stay-green-on-tree.htm

Fruit trees shouldn't need to be watered during the winter in areas with cool or cold climates, because the trees will go dormant. The exception is if there is a serious drought. In that case you can remove the fabric and water the trees as needed.

We would need to know the type of fruit tree that you are referring to give specifics on care and reasons for lack of fruit.

Generally speaking lack of fruit can be due to growing conditions, lack of maturity, pollination issues, watering and nutrient problems.

I suggest that you should level it and make paths, that would make it much much easier to walk. If you plant anything around trees, the situations might get much worse.

You should remove the covering just after the last frost date in your area. You can look up your last frost date at your local extension service's website or on many other websites.