2000

        Forty-two hard spring wheat and 30 durum varieties were planted in early May on land that had been recropped to wheat for about 20 years.  About 30 hard spring wheat plants were harvested from each plot on July 18 through July 24 by replication at the mid dough growth stage and the durum plants were harvested similarly on July 25 through July 28.  Twenty to thirty subscrown internodes were extracted from these plants, identified by plot entry and replication, placed in envelopes and sent to Dr. Robert Stack for scoring CRR infection levels and statistical analysis. 

        Results from the year 2000 indicate that hard spring wheat varieties Norpro, Hager, Ingot, Ivan and Amidon were among the most tolerant to CRR while Trenton, Forge, Dandy, Sharp, Keene and Gunner were among the least tolerant to CRR.  Durum varieties that were among the most tolerant to CRR include Voss, Monroe, Lloyd, Renville and Munich while Kyle, AC Navigator, AC Avonlea, Rugby and Lebsock were the least tolerant to CRR. 

2001

        Fifty hard spring wheat varieties and 32 durum varieties were planted on May 8 in the manner described above in 2000.  Harvest of plants occurred at mid dough on July 25 through July 30 for hard spring wheat and August 1 through August 3 for durum.  Subcrown internodes were extracted from the plants in the manner described above in 2000 and sent to Dr. Robert Stack for CRR scoring and statistical analysis of the data. 

        Results from 2001 show that hard spring wheat varieties Amidon, Grandin, Alsen, McNeal and Argent were among the most tolerant to CRR while Conan, Dandy, Coteau, Oslo and Keene were among the least tolerant.  Edmore, AC Melita, Wakooma, Voss and Pierce were among the most tolerant durum varieties to CRR while Kyle, AC Navigator, AC Avonlea, Lebsock and Rugby were among the least tolerant varieties.

2002

        Sixty-two hard spring wheat varieties and 36 durum varieties were planted on May 21 in the manner described above in 2000.  Harvest of plants occurred at mid dough on July 24 through July 29 for hard spring wheat and July 29 through July 31 for durum.  Subcrown internodes were extracted from the plants in the manner described above in 2000 and sent to Dr. Robert Stack for CRR scoring and statistical analysis of the data.  No results from 2002 are available at this time.

        No variety of hard spring wheat or durum was immune but significant varietal differences in CRR reaction were observed for both spring wheat and durum.  Variations in CRR resistance can be influenced by environment so sampling environments over years is important.