The following is the acutal scale we use to evaluate roses in the field/beds:
- Black Spot - Powdery Mildew
The above scale can also be used for Rust, Cercospora and Downy Mildew.
- 0=no mildew on plants
- 1=one or two isolated infections
- 2=slight infection throughout plant
- 3 to 7=based on % leaves infected
- 8=most foliage, stems and peduncles with infection
- 9=heavy infection throughout plant
Flower Evaluation Scales
- Flower Intensity
Flower Intensity should be done at least monthly- each evaluation period needs to consider optimum intensity to avoid bias due to time of evaluation.
- 0=no flowers
- 2=20% of plant surface with flowers
- 5=50% of plant surface with flowers
- 7=70% of plant surface with flowers
- 9=>90% of plant surface with flowers
For best ratings the flowers need to be displayed above the foliage.
- Flower Cleaning
- 0=flower does not lose petals and balls (ie Belinda's Dream), needs dead heading
- 5=good, petals tend to turn brown before falling
- 9=petals fall cleanly before turning brown and ugly
- Landscape Performance Rating
1 and 2 is unacceptable.
- 1=large leaf loss and weak plant with excess of deadwood
- 2=same as 1 but does not have as much deadwood and shows signs of vigor
- 3=large leaf loss but has good vigor and little dead wood
- 4=some leaf loss but little disease and good landscape appearance
- 5=little if any disease, good vigor with little or no disease loss, outstanding landscape appearance
3 has good regrowth potential and might work with some chemical disease control.
4 would be minimum for Superstar status.
5 reserved for outstanding varieties.