Another consideration is how to kill the wheat crop, if producers plan to re-crop, he said.

“For glyphosate to be effective, it has to be absorbed by healthy, growing plant parts. Wheat that has been injured and is not dead yet, but not growing well, will be hard to kill with glyphosate,” Peterson said. “Paraquat is not a good alternative. Paraquat will burn back the top leaves, but is not translocated in the plants and will not kill the crowns and buds if they are still alive. The best approach is probably to wait until healthy regrowth from the crown is six inches tall before applying glyphosate.”

Always refer to the specific herbicide label regarding crop rotation guidelines and restrictions, Peterson said.

“Label guidelines for crop rotation are often complicated by soil pH and geography. Some product labels have very rigid crop rotation restrictions, while other labels allow shorter intervals in the case of catastrophic crop failure, as long as the producer is willing to accept the risk of crop injury,” he said.

Another confusing issue may be the existence of supplemental herbicide labels with shorter crop rotation guidelines than the regular label. Herbicides with supplemental crop rotation labels include Finesse, Ally and Ally Extra.   

Brand names appearing in this release are for product identification purposes only. No endorsement is intended, nor is criticism implied of similar products not mentioned.