This article is from the Rose Gardening FAQ, by Bill Chandler chandler@austin.ibm.com, Jolene Adams jolene@cchem.berkeley.edu, Brent C. Dickerson odinthor@csulf.edu, Karen Baldwin kbaldwin@veribest.com, and many contributors
Before the Modern Roses, yellow was only known in some of the old species
roses and a dull, muted tone was showing up in some of the Tea/China
crosses.. Pernet-Ducher and others worked at crossing 'R. foetida persiana'
('Persian Yellow'} with Hybrid Teas and Hybrid Perpetuals and eventually
they achieved true yellow roses. They also passed on R. foetida's
susceptibility to blackspot. Since they were growing these roses in France
where (at the time) blackspot was largely unknown, they were unaware of the
problem. We are very aware of it these days, both in our Modern Roses and in
many of the Old Roses. After all, that's where Modern Roses came from!
 
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