By the end of the century, scientists expect climate change to reduce corn yield significantly, with some estimating losses up to 28%. But those calculations are missing a key factor that could drag corn yields down even further: weeds.

Wetter springs and hotter, drier summers, already becoming the norm in the Corn Belt, put stress on corn during key reproductive stages, including silking and grain fill. But those same weather conditions can benefit the scrappy weeds that thrive in tough environments.

The analysis highlights the need to move away from reliance on simplistic weed control systems under climate change. Williams says weeds are adapting to existing herbicides, and a new product won’t be a silver bullet. Nor would any other single tool, regardless of how novel the technology is.

“History has shown us that it won’t do any good to innovate some brand new tool if we rely too heavily on it. We do need new tools. Whether that’s harvest weed seed control, genetic engineering approaches, robotic weeders, or another advancement. There’s progress being made in many areas, but as new tools become available, we need to diversify how weeds are managed. Not just with registered herbicides, but all available tactics,” Williams says.

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