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Tossed Out

Are robots the final frontier for wiping out super weeds?

This drawing imagines what a weed-seeking robot could look like, armed with different tools to attack different problem plants. (Courtesy Steve Young)
This drawing imagines what a weed-seeking robot could look like, armed with different tools to attack different problem plants. (Courtesy Steve Young)

A future without weeds would be a kind of farmer utopia, but currently, herbicide resistant “super weeds” are part of today’s reality. Some researchers, though, are looking for a solution that seems ripped from science fiction: weed-seeking robots.

After years of being burned by glyphosate, the generic name for Roundup herbicide, weeds like palmer amaranth, marestail, and giant ragweed are able to live long and prosper where the widely-used chemical is no longer effective. That concerns Steve Young, a weed ecologist with the University of Nebraska West Central Research Center in North Platte, Neb.

“Right now it’s sometimes recommended that if you’ve got a herbicide resistant weed population to go out and spray more or do another application because that will kill it, maybe,” Young said.

But, Young said, more herbicide can lead to even stronger resistance and additional chemical runoff into the environment. So he and other researchers are pursuing robots as an alternative to dealing with the super weeds of the future.

Imagine fleets of small robots, constantly roaming the rows, seeking and destroying alien plant-forms. Today, farmers spray herbicide on everything to kill a few weeds. Young said robots could treat each weed individually.

“The computer would know what species it’s dealing with, the appropriate weed control tool, and you’d be done with it,” Young said.

As we’ve already reported, putting robots in the field is not such a far-fetched idea. And  some tractors are already robot-like – they can drive themselves with or without a person in the cab. But Young says autonomous weed-bots are still possibly a decade off.

In a series of seminars earlier this year at the University of Nebraska Lincoln, researchers talked about the opportunities and challenges for weed control robots. At this point, programming sensors to recognize the difference between crops and weeds is a major technical hurdle, but one researchers are chipping away at. For instance, Young said, the smartphone app Leafsnap can identify dozens of different tree species but that technology is not yet fast or smart enough to spot a weed in real-time in the field.

“Things are kind of slow,” Young said. “It’s kind of crude and clumsy right now.”

But herbicide resistance is a problem with no simple solutions and Young believes if scientists can someday roll out a robot that works, the message to weeds will be that resistance is futile.