> 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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