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Re:disease resistance

While Susan's suggestion does make sense, I just wanted to point out that
there is also differences in the fungal strains that cause blackspot from
one geographical region to another.  There have been several studies done
which showed that strains of the blackspot fungus from one part of the US
were able to to infect plants that were considered resistant to blackspot in
another area.  This may be one reason why I've often heard it recommended
that you check with other rose growers in your region with regard to what
roses they have found to have good disease resistance.

At 02:07 PM 3/21/00 -0800, you wrote:
>I am no plant breeder or horticulturist but this makes some sense to me.
>Since our plants are not CLONES, but cuttings and where we get our plants
>determines what cuttings they have come from, it would seem they could be
>somewhat variable.
>

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Javier Castillón, Ph.D.
USDA-ARS, U.S. National Arboretum
Floral and Nursery Plants Research Unit
Rm 238, Bldg 010A, BARC-West
10300 Baltimore Ave.
Beltsville, MD 20705
USA

e-mail:   jcastill@asrr.arsusda.gov
phone:  (301) 504-5469, ext. 229
fax:  (301) 504-5096
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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