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  • From: sunnfarm AT netscape.net
  • To: market-farming AT lists.ibiblio.org (Market Farming)
  • Subject: Re: [Market-farming] roll up sides
  • Date: Fri, 18 Apr 2003 10:15:48 -0400

Starting in May and throught the summer remove the plastic and only use shade
cloth, this will solve all your heating problems. In my hoophouse I have 20"
holes in the roof where excess heat can vent along with side openings, I use
one year plastic that is discarded after the season...Bob.

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>From sunnfarm AT netscape.net Fri Apr 18 10:18:26 2003
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Date: Fri, 18 Apr 2003 10:18:24 -0400
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Subject: [Market-farming] RE: Stewarts wilt index
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>I got my first field of sweetcorn planted on the 15th.   You would think a
>very cold winter would kill off the flea beetles that carry stewarts
>bacterial wilt, not so. My stewarts wilt index for my farm came in at 95,
>anything over 90 means trouble. I band a systemic to control FB.  If you
>grow corn you might want to get the index for your farm, contact your
>regional IPM...Bob.
>Sunny Meadow Farm
>Bridgeton, NJ.

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>From Millvalleycsa AT aol.com Fri Apr 18 11:33:06 2003
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Subject: [Market-farming] mulching shallots
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Has anyone out there ever mulched their shallot beds (planted in spring) for
weed control? I'm thinking that since I do it for garlic, can't I do the
same thing for shallots? Can I lay the mulch (straw) now or should I wait
'til they sprout? If I lay it before sprouting, how thick should it be to
enable the shoots to get through?

Thanks!

Renee
Stratham, NH
>From steved AT ncat.org Fri Apr 18 13:00:49 2003
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Subject: [Market-farming] Re: Vinegar source anybody?
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Vinegar for weed control is a hot topic, so I will post
the following resources.

I see that some of the natural herbicide products on
the market now have the USDA Organic label. That is
good to know. It opens options for non-chemical weed
control in organic no-till, perennial crops, pathways, etc.
You probably just have to try it to gain an appreciation for
efficacy -- how much weed control you can really get, and
how much it's going to cost.

Here is the USDA-ARS web page that summarizes
the USDA research effort. This is what generated so
much interest in this topic.

The "Vinegar as an Herbicide" Information Page
of The Sustainable Agricultural Systems Laboratory
http://www.barc.usda.gov/anri/sasl/vinegar.html

"Greenhouse and field research have been conducted at
Beltsville, Maryland, to determine the efficacy of vinegar for
controlling weeds. The results indicate that vinegar can kill several
important weed species at several growth stages. Vinegar at 10,
15 or 20 % acetic acid concentration provided 80-100 percent
kill of selected annual weeds, including giant foxtail up to 3 inches
in height, common lambsquarters up to 5 inches, smooth pigweed
up to 6 inches, and velvetleaf up to 9 inches."

However, this page does not include additional details, such
as restrictions for legal use and wholesale sources of acetic
acid.

Iowa State Univ and Univ of Wisconsin put out the
following articles that address these concerns. See:

Acetic Acid (Vinegar) for Weed Control Revisited
Micheal D. K. Owen | Iowa State University
http://www.weeds.iastate.edu/weednews/vinegar.htm

Acetic Acid (Vinegar) for Weed Control
Jerry Doll | Univ of Wisconsin
http://ipcm.wisc.edu/uw_weeds/extension/articles/aceticacid.htm

"It is important to recognize that the use of acetic acid (vinegar),
unless the material is specifically labeled as a herbicide, is illegal
and a violation of FIFRA. A number of companies have registrations
for acetic acid to be used as a herbicide. This information can be
accessed at http://www.gardenville.com, http://www.greensense.net,
http://www.bradfieldind.com, and http://www.biconet.com";

The people that regulate pesticides -- and how they
focus on home-made products and recipes-- are picky.
You may want to check with your State Dept of Agric as
well as your organic certification agency for approved
ideas on home-made acetic acid mixtures for weed control.

Otherwise, you can look into approved products (natural
herbicides) containing acetic acic, lemon oil, clove oil, etc
from one of the suppliers listed above. For example, I see
that Biocontrol Network carries Burnout (vinegar + lemon juice)
and Matran (clove oil, acetic acid) natural herbicides,
and each carries the USDA Organic label.

For insight into wholesale types of acetic acid, and how one
product supplier has found "wiggle room" for legal sales
of acetic acid, see:

Fact Sheet for Vinegar/Acetic Acid Recommendations
http://wsprs.wsu.edu/VinegarFactSheet.pdf

Bradfield Natural Fertilizers, in Springfield, Missouri, is
the company selling 20% concentrated acetic acid
http://www.bradfieldind.com

BD-Now, the email list on Biodynamic farming, had a good
thread on vinegar for weed control, in June 2002. You
have to poke through the archives, but the posts contained
insights into dilution, caution as to its safe use in mixing, and
mixing with citric acid for synergistic weed killing effect.
http://csf.colorado.edu/archive/2002/bdnow/mail19.html

Regards,
Steve Diver

==================================================
In response to:

Folks,
I am trying hard to find a source for potent vinegar. Somthing greater
than
the 5% strength you find on the grocery store shelves. Anybody have a
source they would share? We want to use it for weed control. The
stronger
the better.
Bob, Kathleen, and Kory Brocious
==================================================
==================================================





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