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Re: CULT: Leaf Spot-Boron Deficiency?

Coal dust at least contains humic acid which has known anti fungal effects
so this may be the same as coal smoke. Sprinkling coal dust over your iris
would probably look worse than the leaf spot though.

Simone Clark
Canberra Australia

At 01:56 PM 10/02/98 -0700, you wrote:
>In a message dated 98-02-10 14:37:07 EST, Mike Lowe writes:
> In the apocrypha of iris literature there is a strong belief, (myth?) that
> iris grown in urban areas where coal smoke is at high levels are usually
> completely free of leaf spot. (could they be referencing 'auld reeky'?)
>  >>
>Interesting.  I have noticed that some local gardens deep in a steel city
>are ALSO not only devoid of leaf spot, but also have far less soft rot.  I
>have always maintained that some kind of fallout from the coke ovens is
>responsible - and I'm only half-kidding.  
>Kathy Guest
>E. Aurora, NY

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