The Weed Zapper Goes to the Neighbors

There’s a piece of equipment on my farm that kills weeds with electricity. It’s called a Weed Zapper, and the first time I heard about one, I thought it was nonsense.

I was working as an organic inspector at the time, walking farms across Iowa, and I kept running into growers — usually the ones whose fields were really out of control with weeds — talking about how they were going to “get some electricity in here and clean this up.” I was skeptical. It sounded like the kind of thing a desperate person says. So I did some research, figuring I’d confirm it was a gimmick.

Turns out using electricity to kill weeds has been around for decades. The modern version just made it safe and practical. The way it works is almost simple: there’s a copper bar carrying voltage, and as long as nothing touches it, nothing happens. But when a weed standing above the crop canopy touches that bar, current runs down the stem, boils the water in the plant’s cells, and bursts them. The weed dies. One pass, minimal soil disturbance, no chemical, and you’re killing the weeds before they go to seed — which means you’re drawing down the weed seed bank for future years too.

I run one now. And like the roller-crimper, I don’t keep it to myself.

The headlands are a perfect example. The headlands are the edges of a field, and they’re a problem spot, because that’s often where a farmer’s sprayer doesn’t reach — they don’t want to drift chemical onto the neighbor’s ground, so the edges go untreated and the weeds take over. Well, the Weed Zapper handles exactly that. So word got around my community that I had this implement, and now I go field to field doing other farmers’ headlands for them.

I love that part of it. Not the zapping — the going field to field. Because that’s the whole thing I believe about how a farming community gets better. It doesn’t happen one farm at a time, each person guarding their own edge. It happens when somebody who has a tool takes it to the people who don’t.

And here’s what I’ll tell you about that Weed Zapper and the roller-crimper both: these aren’t just organic tools. I think conventional farmers are going to be using them too, before long. Anywhere herbicide resistance is becoming a problem — and it’s becoming a problem nearly everywhere — a tool that kills weeds without chemistry has a place. The big equipment manufacturers know it. They’ve come out to my farm to take data off the tractor while the unit’s running. They can see the writing on the wall.

It’s one more tool. That’s how I think of it. One more tool, and the more hands it’s in, the better off we all are.