> ...dead brown grass a foot either side of every row of vines, from insecticide which is applied every 6 weeks.
You must be talking about herbicide, not insecticide. Herbicide kills unwanted plants, that's the whole point. It generally doesn't kill insects or "everything around it". Numerous unsuccessful attempts were made to show that Roundup/Glyphosate was harmful to bees, for example.
> I do not want to eat fruit or plant byproducts from roots which are constantly exposed to weedkiller or insecticide so strong that it kills all around it (except the root itself).
You should be aware then that there is such a thing as organic pesticides/herbicides which are no less "harmful" than their non-organic counterparts. The difference between organic/non-organic is generally whether a compound is synthetic or not, which is a completely nonsensical distinction from a health/environmental standpoint.
Herbicides/Pesticides are indispensable tools for modern agriculture. They generally have been tested to be safe to use on produce for human consumption. You should probably be more worried about the natural chemicals that some of these plants contain.