The spring wheat line ‘Tokai-66' (T-66) (PI#382161) was originally developed in Japan in the late 1960's. We tested T-66 in three years of field trials in our Fusarium-inoculated high-disease pressure FHB nursery. While its visual FHB severity was only slightly lower than average, the percentage of scabby kernels in harvested grain was consistently among the lowest, as was the level of DON. In greenhouse tests we included T-66 as one parent in two replicated half-diallele trials. The FHB score of T-66 was similar to the other FHB-R parents and the FHB-R checks. The F-1 lines with T-66 as a parent were distributed through the range of FHB severity scores. In contrast, The level of scabby kernels in T-66 was lowest of all parents, and the F-1's involving T-66 were among the lowest of all the F-1's. Using Griffing's formula for calculating general combining ability (GCA) in these trials, the GCA of T-66 for FHB severity was significant and similar to the two other FHB-R parents. In contrast the GCA of T-66 for scabby kernels was the greatest of any of the parents. T-66 has been used as a parent in the NDSU hard red spring wheat (HRSW) breeding program and several NDSU HRSW advanced lines which include T-66 in their pedigrees are in field yield trials.
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