Soybean fields are becoming increasingly infested with a glyphosate-resistant weed called 'palmer amaranth.' One pesticide currently used for controlling it is 'Dicamba,' but it has devastating effects on adjacent areas, because it tends to drift when sprayed during windy conditions. Researchers report that they have now developed a drift-free, weed-specific applicator, which will pave the way for autonomous weed control with smart robots.