Garden Pests and Diseases: Insecticide in garden soil as preventative??, 1 by JoParrott

JoParrott wrote:
I would think that to work that way the pesticide would need to be systemic, and as far as I know there is only one that is safe for edibles. I started using it last year with some success, but it does not control spider mites- did a good job deterring aphids. It is a thick liquid that you mix and water into the soil at the time of planting, or when seedlings emerge. It is used only once . It's pricey, and not many nurseries carry it.