While they are up there they should be spraying agent orange or something of the sort on those Poppy fields.
Nah, just sock 'em with some fuel-air explosives.....what doesn't get uprooted will get scorched and shriveled, and what doesn't get scorched will get blown down onto the ground.
That, or just have some guys sprint through the fields with flamethrowers, getting a good fire going. Same diff.