Onion's and garlic can be planted in between other vegetables to help keep the bugs away.
Rodent Repellant's
I have found that moth balls work the best at keeping rodents and even cats and dogs out of flowers bed and gardens. Just don't put them to close to the plants, I recommend placing them about 4 to 6 inches away from the plants.
Marigolds are a good mosquitos repeller, so plant them around your garden and highly trafficked areas to keep mosquitoes away. I have found that the standards work better than the dwarf marigold . Keep in mind for planting in the spring.
1 can of beer and a smal saucer. Put the beer in the saucer , and place the saurcer on the gourd where your having problems with snail and just wait a couple of days and the snails will find it and drowened them selves in it. Refresh as needed for them to die.
