Some often wonder why there have not been any new herbicide modes of action registered in the past decade or so.
In fact, it has been more than 30 years since the last unique herbicide MOA (HPPD/group 27) was introduced to the U.S. market.
Since then, several new herbicide active ingredients within already existing MOAs — and many new premixed or revised formulations of older active ingredients — have been brought to market. Unfortunately, these “new” products and trade names cause confusion because many assume these are something novel and different.
Read more here: https://www.farmprogress.com/commentary/what-s-preventing-a-new-era-of-herbicides-