Description:
The breeding lines were derived from crosses between cultivars `Salinas 88' that has mo-1e (mo12) alleles, and `Glacier' and `Misty Day' that have cor alleles. The F1 plants were backcrossed to `Salinas 88' once, and BC1F1 and BC1F2 generations were screened for resistance to LMV in a greenhouse. BC1F3 to BC1F6 progenies were grown in a field with a history of corky root disease and were selected for resistance to corky root and desired head characters. BC1F6 breeding lines 04-0344, 04-0350, 04-0353, 04-0363, 04-0368, and 04-0375 are from the original cross to `Glacier', while 04-0379 came from the cross to `Misty Day'.