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Blight or Blackleg
On 30/05/2017 08:16, Chris Hogg wrote:
On Tue, 30 May 2017 07:28:13 +0100, "Bertie Doe" wrote: Many thanks Chris, much appreciated. I note that the "copper sulphate and lime mix, was developed in the Bordeaux region of France" - so there's the connection. There was also a Burgundy mix, copper sulphate neutralised with caustic soda. Both were developed to combat fungal attack on grape vines, but they were applied very generously, and over many decades resulted in a build-up of copper in the soil. I'm not sure whether that's the principal reason for all the various copper fungicides being banned, but it was contributory. Cheshunt compound is copper sulphate neutralised with ammonium carbonate. Used sparingly I doubt it is that much of a problem. Used regularly on the same crop in the same dry ground it gradually builds up which is what caused them problems in France. I suspect plants tolerate copper quite well so it is more a problem of contaminating groundwater. All the copper based fungicides work by inhibiting certain enzymes that are present in damping off, mildews and blight fungi. -- Regards, Martin Brown |
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