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This article should help: https://www.gardeningknowhow.com/plant-problems/pests/organic-snail-control-how-to-control-garden-snails.htm

This article will help you with caterpillars in your garden:
https://www.gardeningknowhow.com/plant-problems/pests/insects/prevent-caterpillars.htm

You can also try neem oil, which is also effective on worms and caterpillars. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

June beetles are nocturnal and will gravitate to a light source so if you have lights on in your garage they will enter. They also have as a natural enemy a very common fly which will lay its eggs on the back of the beetle and the larvae feed off the beetle causing sudden death like you've described. After pupation - short of introducing a natural enemy like the wasp - the only way to eliminate June beetles is to spray or fumigate with an insecticide. Knocking them individually into a small jar of gasoline will also kill them. Though you may not think you have any in the garden the larvae are burrowers and you may have an infestation. Check your garden for stunted or wilting plants and over water areas around these. The abundance of water will cause the larvae to gravitate to the surface and they can be manually removed at that point.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/problems/pests/tent-worms-tent-caterpillar-home-remedy.htm

This article may help: https://www.gardeningknowhow.com/plant-problems/pests/insects-in-the-roots-identifying-and-controlling-root-weevil.htm

Ants do not typically cause problems with the plants themselves but are generally attracted to honeydew left from other pests, like aphids. Getting rid of the offending pest will help with the ants. Neem oil is effective for most pest problems and is a safer alternative to using chemicals. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

In the meantime, here is an article or two that you may also find helpful: https://www.gardeningknowhow.com/plant-problems/pests/keeping-ants-of-flowering-vines-vegetables-and-flowers.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/get-rid-of-ants.htm