Posted 08 May 2013 - 07:01 PM
There are some GMOs designed to produce their own pesticides (some of them, alledgedly, borrowed naturally from brocolli, pyrethrins, etc), so that the farmer doesn't need to apply any pesticides. GMOs with inserted pyrethrins genes are usually not labeled as such, and I presume they are far outnumbered by the ones that are glyphosate ready. Another interesting tid-bit is that French studies are confirming that round-up ready plants are toxic to mammals even when they are never sprayed with round-up...it seems the whole idea of inserting genes at random was a bad idea.
And as for the larger picture, GMOs which aren't sprayed with pesticides are probably still sprayed with herbicides or fungicides. So I would stick with organics at large, and minimize your consumption of conventional and GMO produce. Organics are also grown without chemical fertilizers, which can be contaminated with heavy metals or wash away, leaving the plants nutritionally deficient.