Re:disease resistance

**"Don Corleone" godfatha@hotmail.com>**

>From: rose-list-admin@mallorn.com
>Subject: [Rose-list] Re:disease resistance

>From: Javier Castillon <jcastill@asrr.arsusda.gov>
>
>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.
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>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
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Hello Javier:

yes this is very true.  It is probably one of the reasons why those lists of 
"resistant roses" don't always pan out.

Another reason may be that different people have different tolerance levels 
for the disease symptoms that their roses DO get.

We don't spray any of our own roses for diseases at all and we don't see any 
significant diseases that bother us.

But we are pretty tolerant of symptoms, too.

So over the course of years we have ended up with roses that are disease 
resistant for our purposes HERE.  But that doesn't mean they will be 
resistant to someone else,  somewhere else.

Don from North Jersey

______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com

_______________________________________________
rose-list maillist  -  rose-list@mallorn.com
https://secure.mallorn.com/mailman/listinfo/rose-list