Registration of FC723 and FC723CMS Monogerm Sugarbeet Germplasm Resistant to Rhizoctonia Root Rot and Moderately Resistant to Cercospora Leaf Spot

Foundation, Denver, CO. FC723 has resistance to root-rotting strains (AG-2-2) of Rhizoctonia solani Kühn and intermedi-ate resistance to cercospora leaf spot (caused by Cercospora beticola Sacc.) but is not resistant to the Beet curly top virus (BCTV). FC723 is a population from which to select rhizoc-tonia- and cercospora-resistant, monogerm, O-type parents to infuse some rhizoctonia and leaf spot resistance on the female side of hybrids, and FC723CMS provides a cytoplas-mic male sterile (CMS) female with these characteristics. FC723 is released from seed production 951016HO, and FC723CMS is released from seed production 951016HO1. FC723 is an O-type germplasm with 100 % red (RR) hypocot-yls (89 plants counted) and is segregating for monogerm (of the bulked seed, 94 % is mm). FC723 has FC708 (PI 590845) (Hecker and Ruppel, 1981), a rhizoctonia- and cercospora-resistan