Re: [compost_tea] Powdery mildew, ACT, Grapes, and Roses

From: Carlos De Vicente <cdv_es_at_yahoo.es>
Date: Wed, 10 Nov 2004 20:47:43 +0100 (CET)

La "Bouillie Bordelaise" (in french: stock, pap) is the oldest agricultural fungicide based on copper. Used at Bordeaux (s. XIX) for the grapes.
 
http://www.hclrss.demon.co.uk/bordeaux_mixture.html
 
See the medical applications: sulphur compounds as bactericides, and cooper compounds as fungicides-algaecides (skin and scalp diseases, etc.). I think some heavy metals act as fungicide allways (cinc, cooper, cadmiun, etc.); the more heavy it's, the more fungicide capacity it get.
 
If you wet a gypsum wall, you can see a lot of fungus in few days. Gypsum isn't fungicide. The free copper (or hydroxide) is the authentic fungicide.
 
They are a lot of copper-based fungicide products.
http://froogle.google.com/froogle?q=copper+fungicide&hl=en&lr=&sa=N&tab=ff&oi=froogler
 
I'm sorry my bad English
 
Carlos de Vicente
Madrid (Spain)

soilfoodweb_at_aol.com wrote:
My opinion is that it is the sulfur that is the fungicide, and the copper is the bactericide.
 
Our testing watching the mix kill things on leaf surfaces bears that out. Certainly should do some replicated testing, but neither the time nor money.
 
Elaine R. Ingham
Soil Foodweb Inc., Corvallis, Oregon
Soil Foodweb Inc., Port Jefferson, New York
Soil Foodweb Institute, Lismore Australia
Soil Foodweb Institute Cambridge, New Zealand
Laboratorios de Soil Foodweb, Culiacan, Mexico
Soil Foodweb Inc., Jerome, Idaho
Soil Foodweb Inc., South Africa


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Received on Thu Nov 11 2004 - 02:37:28 EST

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