Registration of 'DALSA 1618' St. Augustinegrass
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abstract
AbstractDALSA 1618 (Reg. no. CV291, PI 702594) is a firstgeneration intraspecific St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] hybrid developed by Texas A&M AgriLife Research in Dallas, TX, from a cross between a droughtresistant polyploid female parent, TAES 5384 (PI 300130, GRIN National Plant Germplasm System), and a semidwarf shadetolerant diploid pollen donor, Amerishade. DALSA 1618 was formerly tested as TAES 589609 and TXSA156. Superior performance and quality from 2010 to 2015 in spaceplant nurseries across multiple environments led to advancing DALSA 1618 to replicated trials in 10 National Turfgrass Evaluation Program (NTEP) locations across the southcentral and southeastern United States. DALSA 1618 was one of the top performers in the 2016 NTEP (20162020). It established faster than CitraBlue and similarly to other tested commercial cultivars. DALSA 1618 exhibited high turfgrass quality in standard and ancillary trials and earlier spring greenup, which was generally better than Floratam. Drought resistance of DALSA 1618 was similar to Floratam (a droughtresistant aneuploid). Tolerance to moderately dense shade was tested in Dallas, TX, from 2017 to 2020, where DALSA 1618 exhibited improved shade tolerance relative to Floratam. This array of environmental testing indicates DALSA 1618 possesses a unique combination of drought and shade tolerance that would allow its use across the southcentral and southeastern United States.
