Re: CULT: Leaf Spot-Boron Deficiency?
Kay Cangemi wrote:
> I don't know specifically about coal smoke, but general industrial air=
> pollution has historically been high in sulfur. If leaf spot is caused=
> fungus, this will definitely cut down on its occurrence.
In Oklahoma back in the 50s & 60s, =
the routine treatment for leaf spot
was dusting with sulfur.