Ann, I think what you have to decide is whether you want to pursue treating the infected roses OR discard and replace them with something more resistant to diseases in your area.
Please read post 1387876
Maybe check out Tyler Rose garden.
http://www.visittyler.com/tyle...
Apparently you have some earthkind roses being tested in Texas also
http://aggie-horticulture.tamu...
I use OxiDate 2.0 (please note how OxiDate is spelled using upper and lower case letters) to CONTROL blackspot.
http://www.biosafesystems.com/...
I use the concentrate formula that gets diluted but it apparently comes in a ready to spray formula.
http://www.arbico-organics.com...
and a ready to use formula:
http://www.arbico-organics.com...
It's like a super strong hydrogen peroxide (OMRI)
Spray on leaves, canes, soil and ALL surrounding plants - start in early Spring - continue into Fall about every 10 - 12 days.
Note: these are merely suggestions. Good Luck
