A yellow flower called Butterweed is popping up in hay and wheat fields across a good chunk of the country and it’s poisonous to livestock. A DTN report says the winter annual often pops up in no-till corn and soybean fields. It’s native to the United States and found from Texas east into Florida, up the east coast through Virginia, and back west all the way to Nebraska. The plant is poisonous to grazing animals like cattle, horses, sheep, goats, and to humans as well. Burndown herbicides are used in the spring when the plants are smaller, but that’s not an option in forage crops and in wheat. The plant is most poisonous during the bud-to-flower stage, and most likely to affect the first cuttings of alfalfa. It doesn’t typically regrow after the first alfalfa cutting of the season. Bales that wind up with a lot of butterweeds in them should immediately be discarded.