Answer: Rain tends to hamper most anti-slug and snail methods. In addition to the pellets (read and follow the label instructions with these) and traps, you can try sprinkling diatomaceous earth (horticulture grade from the garden center, not the kind for swimming pools) on the soil surface around the plants. This will also need to be reapplied after rain, but in my experience the pests need only contact it once to be done in. You can also catch them by hand (I use barbecue tongs) and drop them into soapy water. Pushing aside mulch temporarily can also help to destroy their daytime hiding places.
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