I get them on occasions but as they do not do much harm I just let them get on with it.

My thoughts are; I see them as part of the animal food chain and quite possibly by leaving them to it, predators eat them,rather than my veg!

You could do a bit of hoeing in the area they are at, then drench the area with water and eventually they might move on, but as I said I tend to just leave them to it!