See: Varietal Publication No.
CXXXIX, April, 1990
We are requesting an amended
description for the experimental variety VS-746, now named Express, based
on data from additional testing. Express was originally classified NOT
TESTED, we feel that a moderately resistant rating for bacterial wilt,
and a resistant rating for stem nematode and blue alfalfa aphid more accurately
reflects the Express reaction to these pests.
BACTERIAL WILT
Test conducted by VISTA at West Salem, WI
Resistance Year Syn. Unadjust. Adjust. Score or
Variety Class Tested Gen. %R %R A.S.I.
---------------------------------------------------VISTA--------------
This variety MR 1989 1 18.0 28 3.21
1. Vernal R 25.7 40 3.17
2. WL 316 MR 14.7 23 3.41
3. Narragansett S 0.0 0 4.08
Test Mean: 34.7 54 1.75
L.S.D. (.05) 10.3 16 0.39
C.V. (%) 25.4 25 15.01
Scoring system used: (0-5) 0=no
disease 5=dead plant, (0+1)=resistant
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 39 3.1
1. Lahontan R 52 2.6
2. Ranger S 9 4.0
3.
Test Mean: 40.0 3.12
L.S.D. (.05) 15.1 0.49
C.V. (%) 29.5 12.2
Scoring system used: 16 wk old
inoculated seedlings scored 1-5, (1+2)=R
BLUE ALFALFA APHID
Test conducted by A.A. Zarrabi at Oklahoma State University
Resistance Year Syn. Unadjust. Adjust. Score or
Variety Class Tested Gen. %R %R A.S.I.
--------------------------------------------------(by OSU)------------
This variety R 1990 2 23.2 35.5 3.90
1. CUF 101 HR 30.2 45.0 3.70
2. Arc S 2.5 3.8 4.30
3.
Test Mean: 18.0 26.9 3.95
L.S.D. (.05) 5.7 28.4 .17
C.V. (%) 22.0 22.0 3.0
Scoring system used: (1-5) 5=dead, (1+2+3)=resistant