spreading food grade Diatomatious Earth in a thin sprinkling over your garden will kill any bugs present, but not your garden. It is completely organic, the only drawback is that it will kill beneficial bugs as indiscriminately as bad one. It is safe though for your chickens and pets, yourself...
My chickens will eat just about any veggie (they love ripe tomatoes!) and anything green so it wouldn't surprise me in the least if they went after garden plants as badly as I have heard. I have yet to plant my garden down by the barn where it's eventual home will be so I haven't yet had the...