What was the first reported incidence of herbicide resistance in the US?

The first reported incidence of herbicide resistance in the United States occurred with spreading dayflower in Hawaii in 1957 and was associated with the use of 2,4-D. This instance is significant because it highlights the early recognition of the phenomenon of herbicide resistance, which has implications for the management of agricultural and aquatic environments.

Understanding that spreading dayflower showcased resistance reinforces the concept that certain plant species can adapt to herbicides over time when exposed to them, leading to failures in weed control efforts. The choice illustrates a crucial point in the history of weed management strategies and the ongoing need for effective resistance management practices. This early case set a precedent for monitoring and addressing herbicide resistance in a wide range of crops and non-crop environments, making it a pivotal moment in the evolution of weed management in the United States.