Evaluation location: California, United States
Experiments were conducted in 2004 and 2005 in a V. dahliae-infested field located near Watsonville, CA. The field has a history of Verticillium wilt on lettuce, with an average microsclerotia count of over 60 microsclerotia g of soil (G. E. Vallad and K. V. Subbarao, unpublished data). Cultivars were direct seeded on 7 May 2004 as a randomized complete block design with four replications. See article in Plant Dis. 91:439-445 for more details.
Seed used for this test came from Salinas, California