permaculture

[Mark <mpludwig@facstaff.wisc.edu>]

> Date: Thu, 30 May 2002 12:35:11 -0500
> From: "James, Roger L DATCP" <Roger.James@datcp.state.wi.us>
> Subject: [grazersedge] Info on vinegar as a weed killer
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> Thought this might be of interest to some.
>
> SOME SOUTH DAKOTA FARMERS WAGE WAR ON WEEDS -- WITH VINEGAR
> May 27, 2002
> Knight-Ridder Tribune
> David Dickey
> Vinegar is, according to this story, quickly becoming a popular product in
> the war on weeds.
> Gary Cwach, a farmer in Yankton, was quoted as saying, "I started using it
> three years ago. I was having a lot of trouble with Canada thistle, and
> nothing I tried worked. I finally tried using vinegar, and it worked well.
> Using it and getting the calcium level in the soil where it belongs have
> been the key."
> Cwach was further cited as saying that vinegar is not only cheaper than
> chemical herbicides, it's also a safer and more natural way to get rid of
> weeds. He buys 55-gallon drums of vinegar for $300 each. Cwach dispenses the
> vinegar by putting it into a 15-gallon spray tank that he attaches to an
> all-terrain vehicle. The vinegar, which is fully biodegradable, is released
> through a 14-foot-long boom. He said he usually makes two passes over areas
> in need of spraying. On average, he uses about five gallons of vinegar an
> acre.
> The story says that ARS researchers Jay Radhakrishnan, John R. Teasdale and
> Ben Coffman began a scientific study of vinegar as a weed killer about two
> years ago. The study is credited as being the first of its kind.
> So far, the researchers have tested vinegar on the most common weeds,
> including common lamb's quarters, giant foxtail, velvetleaf, smooth pigweed
> and Canada thistle. The tests have been done in a greenhouse and in the
> field.
> The weeds' leaves were sprayed uniformly with various solutions of vinegar
> made from fruits and grains, and the researchers determined that 5- and
> 10-percent concentrations killed the weeds during their first two weeks of
> life. A bottle of household vinegar is about a 5-percent concentration.
> Older plants required higher concentrations of vinegar to kill them. At the
> higher concentrations, vinegar had an 85- to 100-percent kill rate at all
> growth stages.
>
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Mark P. Ludwig
Poultry Research Lab
University of Wisconsin -Madison
608-262-1730 WK
608-846-7125 HM