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Abstract
A total of 155 recombinant inbred lines (RIL) derived from Tifrunner NC 3033 andfive checks were evaluated for stem rot resistance from 2013 to 2015, while another 126 lines from the same RIL population and 10 checks were evaluated for stem rot and Rhizoctonia limb rot resistance in 2016 and 2017. A wide range of disease resistance to both stem rot and Rhizoctonia limb rot as well as transgressive segregation was observed within the population. The QTL analysis results suggested several regions on chromosome A05/B05 explaining more than 20% of the total variation observed. Various stem rot and Rhizoctonia limb rot bioassays were also tested. The bioassay using tape to position inoculum on tissue gave the most consistent results, but the disease levels rated with this bioassay were not always highly correlated with disease levels in the field.