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'CP 10‐1620' (Reg. no. CV‐216, PI 693837) sugarcane (a complex hybrid of Saccharum spp.) was developed through cooperative research conducted by the USDA–ARS, the University of Florida, and the Florida Sugar Cane League, Inc. At the June 7, 2018, Florida Sugarcane Variety Committee Meeting, CP 10‐1620 was released to growers for mineral (sand) soils in Florida, and seed was available in September 2018. CP 10‐1620 was selected from a polycross of 'CP 00‐1100' × 'CP 05‐1740' (Cross no. X07‐1225) made at Canal Point, FL, in December 2007. Neither the female parent, CP 00‐1100, nor the male parent, CP 05‐1740, is a commercial cultivar. Cane yield of CP 10‐1620 on sand soils, averaged across 12 harvests through three crop cycles (plant cane, first ratoon, and second ratoon), was 11.0% higher (P < 0.05) than the combined mean of three checks, 'CL 88‐4730', 'CP 96‐1252', and 'CPCL 97‐2730', which are commercial checks for sand soils. The commercial recoverable sucrose for CP 10‐1620 was not significantly lower than the combined mean of the checks but the higher cane yield resulted in 8.4% higher (P < 0.05) sucrose yield than the combined mean of the checks. CP 10‐1620 was released because of its high cane yields on sand soils, and its acceptable levels of resistance to brown rust (caused by Puccinia melanocephala H. & P. Sydow), leaf scald (caused by Xanthomonas albilineans Ashby, Dowson), Sugarcane mosaic virus strain E (mosaic), smut (caused by Sporisorium scitamineum), Sugarcane yellow leaf virus, and ratoon stunt [caused by Leifsonia xyli subsp. xyli (Davis et al.) Evtushenko]. CP 10‐1620 was moderately susceptible to orange rust (caused by Puccinia kuehnii E. J. Butler), and it has high freeze tolerance. CP 10‐1620 tested positive for the Bru1 locus, which is an indicator of brown rust resistance. Core Ideas: CP 10‐1620 is a new sugarcane cultivar in Florida.CP 10‐1620 has high yields of cane and sucrose in Florida.CP 10‐1620 is resistant or moderately resistant to the typical diseases found in Florida.CP 10‐1620 is the result of a cooperative effort between the USDA, UF IFAS, and the Florida Sugar Cane League.CP 10‐1620 has high cold tolerance. [ABSTRACT FROM AUTHOR]

'CP 13‐1954' (Reg. no. CV‐218, PI 704104) sugarcane (Saccharum spp. hybrid) was developed through cooperative research conducted by the USDA–ARS, the University of Florida, and the Florida Sugar Cane League, Inc., and released to growers for organic (muck) soils in Florida in June 2020. The parentage of CP 13‐1954 is 'CP 85‐1491' × Poly 09‐24. Based on the results of three crops (plant cane, first ratoon, and second ratoon) in field trials conducted at five locations, CP 13‐1954 had higher cane yield (16.2%), sucrose yield (15.6%), and economic index (29.7%) at P <.05 compared with the reference cultivar, 'CP 96‐1252'. CP 13‐1954 stalks are usually taller than the reference cultivar, 'CP 00‐1101', with small‐to‐medium diameter, and exhibits resistance to ratoon stunting disease, Sugarcane mosaic virus strain E, brown rust, orange rust, and smut and moderate resistance to leaf scald on muck soils in Florida. CP 13‐1954 has Bru1 locus that provides resistance against brown rust. CP 13‐1954 showed moderate cold tolerance among all the tested cultivars. Core Ideas: CP 13‐1954 is a new sugarcane cultivar released for organic soils in Florida.CP 13‐1954 yields higher than commercial checks in organic soils in Florida.CP 13‐1954 is resistant to most of the common sugarcane diseases in Florida.CP 13‐1954 has moderate level of freeze tolerance. [ABSTRACT FROM AUTHOR]

'CP 13‐4100' (Reg. no. CV‐202, PI 698546) sugarcane cultivar (a complex hybrid of Saccharum spp.) was developed through cooperative research conducted by the USDA‐ARS, the University of Florida, and the Florida Sugar Cane League, Inc. The Florida Sugarcane Variety Committee (FSVC) released CP 13‐4100 in June 2020 to growers for commercial cultivation on mineral (sand) soils. It originated from a polycross made at Canal Point (CP) on 3 Dec. 2008 where CP 96‐1252 was the female parent and the male parent was unknown and could be any one of genotypes used in the polycross. CP 13‐4100 was released by FSVC for its high cane and sucrose yields, acceptable commercial recoverable sucrose, and resistances to orange rust, leaf scald, Sugarcane mosaic virus strain E (mosaic), and smut, and acceptable levels of susceptibility to brown rust. CP 13‐4100 and commercial reference checks (i.e., CL 88‐4730, CP 96‐1252, CPCL 97‐2730) yield data were collected from 12 harvests (i.e. three crop cycles—plant cane, first, and second ratoon—at four sand‐soil locations) in final‐stage replicated yield trials. Compared with CL 88‐4730 and CPCL 97‐2730, CP 13‐4100 had significantly (P ≤.0001) higher cane yield (tonnes of cane per hectare: 18.7 and 29.5%), sucrose yield (tonnes of sugar per hectare: 26.3 and 30.7%), and economic index (EI; 10.9–16.9%) and no significant differences from CP 96‐1252 in these traits. CP 13‐4100 tested negative for the Bru1 marker, which is linked to a quantitative major locus of brown rust resistance. CP 13‐4100 could be considered moderately tolerant to freezing among 23 tested genotypes. [ABSTRACT FROM AUTHOR]

'CP 13‐1223' (Reg. no. CV‐204, PI 698176) sugarcane (a complex hybrid of Saccharum spp.) was released to growers in June 2020 for producing on muck soils in Florida. It was developed through a decade‐long cooperative research program between the USDA‐ARS, the University of Florida Everglades Research and Education Center, and the Florida Sugar Cane League, Inc. This cultivar resulted from a poly‐cross made at the USDA‐ARS Canal Point (CP) Sugarcane Field Station. CP 13‐1223 was released because of its high commercial recoverable sucrose (CRS) and stalk weight, and demonstrated acceptable levels of cane and sucrose yields on muck soils. CP 13‐1223 has resistance to orange rust, leaf scald, Sugarcane mosaic virus strain E, ratoon stunt disease, and smut, and moderate resistance to brown rust. Based on results from 13 harvests across replicated yield trials at five locations, CP 13‐1223 performed 29.6 and 9.5% higher in CRS and stalk weight, respectively, than the check cultivar 'CP 96‐1252'. It did not differ significantly from CP 96‐1252 in either cane yield, sucrose yield, or economic profitability. CP 13‐1223 is considered to have moderate tolerance to freezing in field tests. [ABSTRACT FROM AUTHOR]

'CP 12‐1753' (Reg. no. CV‐203, PI 698657) sugarcane (complex hybrid of Saccharum spp.) cultivar was developed through a cooperative research between USDA‐ARS, the Florida Sugar Cane League, Inc., and the University of Florida. It was derived from a polycross made at Canal Point, FL, on 8 Dec. 2010 between a female parent CP 08‐2409 and several male parents. CP 12‐1753 had 11 harvests in Stage 4: plant cane and first ratoon at four locations and second ratoon at three locations. Harvest data showed that CP 12‐1753 had significantly (P ≤.05) higher cane yield and economic index than the reference cultivars 'CL 88‐4730' and 'CPCL 97‐2730', respectively, but had significantly lower cane yield in plant cane and lower economic index than the reference cultivar 'CP 96‐1252'. Freeze tolerance of CP 12‐1753 was lower than the reference cultivars. CP 12‐1753 possesses Bru1, a major gene for brown rust resistance, and showed resistance to brown rust. At the time of release, it was resistant to orange rust, mosaic, and smut. It was moderately resistant to leaf scald and ratoon stunting disease. Considering the agronomic, yield, and disease traits, CP 12‐1753 was released by the Florida Sugarcane Variety Committee in June 2020 to growers for commercial use on mineral (sand) soils. Core Ideas: Sugarcane cultivar CP 12‐1753 was released for Florida mineral soil.CP 12‐1753 has comparable yield to the reference cultivars.CP 12‐1753 has comparable or better disease resistance than the reference cultivars. [ABSTRACT FROM AUTHOR]

Brown rust (caused by Puccinia melanocephala H. & P. Sydow) is one of the most devastating diseases in commercial sugarcane production. It could reduce sugarcane yield by up to 50% depending on the susceptibility levels of cultivars. Breeding disease‐resistant cultivars is the most effective, economical, and environmentally friendly option to control brown rust. A genome‐wide association study was conducted on a field trial using 432 sugarcane clones following an augmented design with two replications. Brown rust was screened using the whorl inoculation method over two crop cycles. The genotype data were obtained through target enrichment sequencing technologies. The gene actions considering six different models and marker dosage effects were included during the marker‐trait analysis. A total of seven, nine, and seven nonredundant marker‐trait associations were identified for plant cane, first ratoon, and across two crop cycles, respectively. The most significant (p‐value 6.17E−20) marker (chr01p59833543) has the additive effect of −0.63 for the diplo‐additive model and reduced disease severity the most (41.35%) due to heterozygote (AG) over homozygote allele (AA) combination in the tested clones. Gene annotation of the monoploid sugarcane genome R570 suggested that six putative candidate genes were co‐located with significant markers associated with brown rust resistance in sugarcane. The putative candidate genes regulated the formation of a cell wall barrier that plays a crucial role in controlling brown rust pathogen infection. The results of this study will open the path to exploiting new resistance sources for brown rust resistance in commercial sugarcane. [ABSTRACT FROM AUTHOR]

'CP 10‐1716' (Reg. no. CV‐195, PI 691536) sugarcane (a complex hybrid of Saccharum spp.) was released (7 June 2018) through cooperative research by the USDA–ARS Sugarcane Field Station at Canal Point, the University of Florida, and the Florida Sugar Cane League, Inc. CP 10‐1716 is recommended for use on mineral (sand) soils in Florida. CP 10‐1716 resulted from polycross X07‐1257 (CP 00‐2180 × Mix07Q; male parent is unknown). Replicated trials at four sand soil locations, with yield data from 12 harvests and three crop cycles (i.e., plant cane, first ratoon, and second ratoon) showed that CP 10‐1716 had cane and sugar yields, and profitability (economic index, US$ ha−1), that were similar to check cultivars ('CL 88‐4730' and 'CP 96‐1252'). Commercial recoverable sucrose (CRS) in CP 10‐1716 was significantly lower than the check averages, but the early CRS was not significantly different from the mean of the checks. The economic index for CP 10‐1716 vs. the mean of the checks was $2490 vs. $2445 ha−1, respectively, with CP 10‐1716 showing no significant difference from the mean of the checks. CP 10‐1716 was rated as moderately resistant to ratoon stunt disease and resistant to brown and orange rust, mosaic, smut, leaf scald, and yellow leaf disease on sand soils. CP 10‐1716 is positive for the Bru1 molecular marker that is one of the indicators for brown rust resistance. CP 10‐1716 has low to moderate freeze tolerance as it relates to sucrose degradation. [ABSTRACT FROM AUTHOR]