Applying Pesticides by Airplane in Wet Fields Peanut Notes No. 89 2019

— Written By NC State Extension

Rain has been heavy across portions of the state and there are concerns about delays in pesticide applications and control. Can pesticides be applied by air and still work well? The answer is yes, but it depends on the pesticide. Pesticides (insecticides and herbicides) that have systemic activity can work relatively well in lower spray volumes (with less pressure pushing these into the canopy.)  But contact herbicides that do not move throughout the plant require adequate coverage of weeds for control. Control will be poor with these herbicides (PPO inhibitors) if applied by air. Research clearly shows that slower ground speeds and higher spray volumes increased performance of PPO inhibitors. Fungicides are not listed here, but control can be challenging for this group of pesticides when applied by air. More on this later (if needed.)