Our valiant (Gristmill) advocate for kinder gentler GMO supposes this hypothetical, we need to sway people like this to our organic ag point of view.

"Suppose you are growing, say potatoes, organically and occasionally have to apply a natural fungicide or pesticide derived from another plant grown somewhere else."

You grow the natural plants that repel or suppress parasites along with the potatoes.  Even using crop rotation and mixing mulch made from the repellant plants into the soil for the next potato crop.

Mulch that stops fungus and pests.  And suppresses weeds. Why not?  Copy nature's own strategy.  Walnut trees prevent competing plants from invading their area with natural herbicide built into their genes.  Cedar trees discourage competing fungus and bacteria with genetically coded cedar oil, evolved for that purpose.

And you make and apply the mulch and do the selective planting with robotic equipment, program it and watch it work.  All powered with renewable electricity.

With perfect organic fertilizer and water injected around each plant, they out compete almost every weed and pest anyway.  Mulch and mowing/mulching applied by robots, could eliminate pesticide, herbicide, chemical fertilizer, diesel fuel, 5000 dollar per month tractor payments, and all the GHG that agrichem farming produces.

With the productivity of this organic robotic method, the food per farmer figures could be as high as with chemical ag.  no human stoop labor for picking either, robots can do it, and a lot faster to maximize flavor and shelf life.

To "wiscidea":

I wish you would switch over to our anti-agrichem side and find out which GMO projects actually are designed to eliminate pesticides and herbicides and work with organic farming   That is your field of expertise.

That would be helpfull all around.  Maybe we are wrong to oppose all GMO, I just haven't seen any evidence of it.

I worry about the unforseen effects of GMOs leaking into the biosphere.  Does anyone study this at all, as a wise precaution?  I doubt that universtities engaged in GMO research would do it or that GMO companies would fund it.