Is there a favorite organic recipe (spray) out there that really works good preventing fungal diseases on roses, like black spot.

Please let me know, I wish to start spraying my new rose bushes to prevent any diseases.

Thanks,

Lee Harris
Little Elm, TX

I've been reading some of the other posts; I will take the advice on
the horticultural cornmeal an apply around my new rose bushes &
spray foliage with a cornmeal tea...

Any other suggestions would be great.

Thanks,

Lee Harris

can regular cornmeal be used in substitutionfor horticultural corn meal,
If not, why?