Website/Catalog  (11 Jun 2015)  
 
http://www.angrau.ac.in/media/1658/GPBR311.pdf

Black spot is a major foliar disease of roses that causes severe losses to commercial and home gardens. The breeding lines Spotless Gold (Floribunda, F3 selection: Goldlocks x Rosa rugosa ), ‘Spotless Yellow’ (Floribunda, F3 selection; Goldlocks x Rosa rugosa ) and Spotless Pink (Floribunda, F3 selection: Chic x Rosa rugosa ) have been release for use a resistant parents in breeding programmes.

Website/Catalog  (11 Jun 2015)  
 
http://openagricola.nal.usda.gov/Record/IND80034524

Semeniuk, P., 1979: Spotless Gold, Spotless Yellow and Spotless Pink rose: blackspot resistant breeding lines. HortScience 14(6): 764-765

Book  (1994)  Page(s) 78.  
 
Sam Gough. Understocks.
The Rugosas are as healthy as any rose that I know and in 1979 the research centre at Beltsville, after twenty years of work, released three varieties Spotless Gold, 'Spotless Pink' and 'Spotless Yellow'. These roses are based on a tetraploid Rugosa produced with the use of colchicine. They are said to be low growing, 50 to 75cm, the pink is fully double, while the others are single, and with hardiness being said to be about the same as a normal HT. From a report by an amateur who has raised a few seedlings from these roses, a small percentage of seedlings show an improvement in resistance, but the indication is that it will require many back crossings and selfings to be able to get a reliable strain of resistant roses.

Book  (1990)  Page(s) 134.  
 
Dr. B. P. Pal. The Rose - Its Beauty and Its Science.
P. Semmeniuk of the US Department of Agriculture Research Centre at Beltsville has reported on a long-range programme that has resulted in the evolution of three varieties immune or very highly resistant to black spot, called Spotless Gold, 'Spotless Yellow' and 'Spotless Pink'. These were selected from an F, population derived from crosses between tetraploid form of the black-spot-resistant species R. rugosa

Magazine  Page(s) vol. 14, no. 6, pp. 764-765.  Includes photo(s).
 
Spotless Gold, Spotless Yellow, and Spotless Pink Rose: Blackspot Resistant Breeding Lines
Peter Semeniuk
Spotless Gold, Spotless Yellow, and Spotless Pink are the result of a breeding program begun in 1965 (3) to develop horticulturally suitable rose breeding lines with appreciable levels of resistance. They were selected from an F3 population derived from crosses between a tetraploid form of a blackspot resistant species (Rosa rugosa) and the commercial cultivars 'Goldilocks' and 'Chic'. Selections for disease resistance were made in the greenhouse following repeated inoculations of the F2 and F3 generations. Pollen fertility and seed set were comparatively good in all three cultivars.