Kennedy L. Money, Brady D. Koehler, Christopher G. Misar, Michael Grove, William Underwood, Brent S. Hulke
Abstract: While Sclerotinia head and basal stalk rot and downy mildew have long caused problems for the sunflower (Helianthus annuus L.) production industry, Phomopsis stem canker is a disease that is a growing issue in the United States. Our goal was to provide germplasms that contain resistance to one or more of these problematic fungi while also upholding necessary agronomic traits, including high yield and tolerance to imidazolinone herbicides. RHA 485 (Reg. no. GP‐356, PI 690018) and RHA 486 (Reg. no. GP‐357; PI 690019) are restorer inbred germplasms developed by pedigree method and testcross evaluation. RHA 485 has high‐yield potential with high‐oil content and low Phomopsis and Sclerotinia head rot incidences in the field. RHA 486 possesses high‐yield potential, resistance to Phomopsis (average incidence near 0%), and low incidence of Sclerotinia basal stalk rot. HA 487 (Reg. no. GP‐358, PI 690442) is a maintainer inbred line that has potential for high yield, with Sclerotinia head rot scores that are comparable to the best available checks. These lines were released by the USDA‐ARS, Fargo, ND, to fill the need for germplasms with resistance to multiple diseases in addition to other important agronomic traits.
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