Calda Vicosa is a modified version of Calda Bordelesa which has
been used by brazilians for all sorts of crops for decades. The
concentrations are low enough that it is considered non-toxic.
Same with the other one.
Lena
> Lena,
>
> > A second expirament will look at the effect of two foliar
> > applications on requiema: 1) is "Calda de Vicosa" - a solution
> > of copper sulfate, magnesuim sulfate, zinc sulfate, boric
> > acid, Cal, and water. 2) is sulfer calcium - solution of sulfer,
> > hidrated Cal. These solutions are being used as alternatives to the
> > toxic fungicides available. My question is: Are these really
> > alternatives? I do not have the chemistry background or information
> > available as to their toxicity.
>
> Salts of copper and zinc are far more toxic than most commercial fungicides
> and less effective. Boric acid and salts are toxic too, especially to
> plants.
>
> Dale
>
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