Field evaluation of very early maturity group IV soybean cultivars for resistance to stem canker, 2008

摘要

The susceptibility of 24 very early maturity group IV soybean cultivars to stem canker was evaluated in a trial at Stoneville, MS. Soybean cultivars were planted in sandy loam soil on 20 May 08 at a rate of 10 seed per row ft in a randomized completeblock design with four replications. Plots were one row wide, 13.3 in. spacing, and 20 ft long. The first 12 plants of each plot were inoculated with Diaporthe phaseolorum var. meridionalis by inserting infested toothpicks in the upper 1/3 of the planton 17 Jun 08. Disease resistance was rated on 19 Aug 08 based on a 1 to 5 rating scale where 1 = resistant, 2 = moderately resistant, 3 = moderately susceptible, 4 = susceptible, and 5 = very susceptible. Disease rating was reported as an average of four replications.