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Re: [SHADEGARDENS] Horticultural oil

Barb,

Leaf spots are generally fungal, not insect produced -- some are bacterial,
some viral, so hort. oil wouldn't help.  Best idea would be to take a
sample leaf with spot to your local county extension agent to see if the
particular pathogen can be identified so you would know exactly what you
were trying to treat.

Marge Talt, zone 7 Maryland
mtalt@clark.net
Editor:  Gardening in Shade
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----------
> From: Richard/Barbara Porter <barport@MARS.ARK.COM>
> Date: Tuesday, February 24, 1998 11:44 PM
(snip)
>         So what is a good preventive spray (preferably organic) for
evergreen
> non dormant plants. I have some oregon grape (mahonia nervosa;
> aquifolia) and salal (gaultheria shallon) which have some kind of
> leafspot problem - red circles that turn dark.
>
> Barb
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