Below are two tables based on tests of 136 varieties of roses conducted by the University of Tennessee Extension with support from the US Dept of Agriculture. The results are based on specific criteria; roses with superior resistance were those roses with less than 2% foliage infected with either blackspot or cercospora leaf spot and are considered no-spray roses. Roses rated moderately resistant (less than 10% foliage infected) may need limited spraying to maintain clean folage. These roses are listed in Table 1. A second table lists roses which are tolerant of disease. These roses are susceptible to Black spot and/or Cercospora leaf spot and may defoliate, while blooming well all summer. Roses were not sprayed for disease during the trial period which was conducted over a three year period.

Blackspot from No-Spray pamphlet.	Cercospora leaf spot from No-Spray pamphlet.

The trials were conducted under the direction of James Mynes, Tennessee Agriculture Experiment Station (TAES); Mark Windham, TAES; Alan Windham, University of Tennessed Extension; Cecil Pounders, USDA Agricultural Research Service (USDA ARS) and James Spiers, USDA ARS. Our thanks to Mark Windham for providing the information to display these tables and to all those who helped conduct the trials.