See Varietal Publication No. CXXIII, April, 1987
We are requesting an amended description for the variety Ultra (C/W 423) based on data from additional testing. Ultra was originally classified as NOT TESTED for stem nematode, we feel that a resistant rating accurately reflects the Ultra reaction to this pest.
STEM NEMATODE
Test conducted by Crop Characteristics at Northfield, MN
Resistance Year Syn. Unadjust. Adjust. Score or
Variety Class Tested Gen. %R %R A.S.I.
This variety R 1990 2 54 2.7
1. Lahontan R 52 2.6
2. Ranger S 9 4.0
3. Test Mean: 40.00 3.12, L.S.D. (.05) 15.1 0.49, C.V. (%) 29.5 12.2
Scoring system used: (1-5), 1=no symptoms, (1+2)=resistant