those huge skinny tired spray rigs should be the only thing legal. They are loud, can't be efficient, and the drift off them shouldn't be legal..
Ground-sprayers can't go everywhere, especially in muddy conditions, and they're no where nearly as efficient as aerial applications. Also, pesticide off-target drift (ground or aerial) isn't legal, anywhere - period! Most applicators use a polymer drift-control additive to "thicken" the spray-solution - which reduces or eliminates aerosol particles that are otherwise prone to physical drift. That doesn't mean that odor-drift is always avoidable.
Besides common decency, courtesy and concern for others, it is vital to an applicator's livelihood to take every precaution to guard against physical drift - for obvious reasons - and that means a lot of take-offs at the first crack of daylight.
This aerial applicator was able to treat 170 acres of cattails, lotus and mature willows in less than 20 minutes; without any harm to trees on the other sides of the levee. It would've taken days to do an inferior job with a boat-application.
