Advocates of the new technology say the new crops provide a vital weapon in the war against weed resistance to glyphosate, which is becoming a stubborn and costly problem for farmers across the country.

Unfortunately, stubborn weeds aren’t the only thing that 2,4-D kills, and gardeners, vineyard owners and even other farmers of commodities who don’t switch to the new technology could be affected if the 2,4-D drifts onto their fields.