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This article should help: https://www.gardeningknowhow.com/edible/vegetables/vgen/cross-pollination.htm

If it is holes in the leaves, I would still say that it is slugs or snails. They may just not be gravitating to the traps this year (if you are using commercial traps, the formula may have changed). Try a different trap and lay some sand down around the bases of the plants to keep slugs off them.

You can just leave it be until another application is needed, though if it's really heavy, you may want to dilute it some. Alternatively, you could use neem oil. This article will help with that: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

This sounds like flea beetles. This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/insects/what-are-flea-beetles.htm

I like using neem oil on vegetables to kill pests. It is safe for humans but kills chewing and sucking pests effectively. This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Epsom salt can be added to the soil or you can use eggshells. Both of these methods though take time for the calcium to become available to the plant. In most cases though, there is enough calcium in the soil, but the plant is not getting enough water to be able to use it. Try increasing the amount of water the plants are getting to help them take up more calcium.