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Registration of ‘HoCP 85‐845’ Sugarcane
Author(s) -
Legendre B. L.,
Grishman M. P.,
White W. H.,
Garrison D. D.,
Dufrene E. O.,
Miller J. D.
Publication year - 1994
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1994.0011183x003400030043x
Subject(s) - crop , unit (ring theory) , cultivar , mathematics , biology , horticulture , agronomy , mathematics education
'HoCP 85-845' (Reg. no. CV-94, P1575700) sugarcane, a BC4 progeny of an interspecific hybrid of Saccharum officinarwn L., S. spontaneum L., and S. barberi Jeswiet and a S. spontaneum clone, US 56-15-8, was developed through cooperative research by USDA-ARS, the Louisiana Agricultural Experiment Station of the Louisiana State University Agricultural Center, and the American Sugar Cane League of the USA. HoCP 85-845 is a product of the cross 'CP 72-370' (1)/CP 77-403 made at Canal Point (CP), FL, in 1980 and selected at Houma (Ho), LA, in 1985. Yield data from a total of 55 mechanically harvested, replicated trials on both lightand heavy-textured soils indicated that HoCP 85-845 was superior to 'CP 70-321' (2), the principal commercial cultivar, in yield of total recoverable sugar per hectare (kg ha~') in the plant-cane crop and yield of cane (Mg ha") and number of millable stalks in the plant-cane, first-, and second-ratoon crops. HoCP 85-845 is similar to CP 70-321 in recoverable sugar content (kg Mg ') and maturity. A typical stalk of HoCP 85-845 is light green under the leaf sheath and dark green to light red in areas exposed to the sun. Its stalk weight averaged over the three crops was 0.91 kg, compared with 0.95 kg for CP 70-321. Desirable attributes of HoCP 85-845 are its moderate fiber content (13.05%), its good milling factor (1.016), and its erect growth, which lends itself to mechanical harvesting. Yield losses associated with mechanical harvesting are lower than CP 70-321 and similar to another commercial check, 'CP 74-383' (3). The cultivar is moderately resistant to sugarcane mosaic virus, smut caused by Ustilago scitaminea Syd. & P. Syd., and rust caused by Puccinia melanocephala H. & P. Syd. under Louisiana field conditions. HoCP 85-845 is susceptible to ratoon stunting disease (Clavibacter xyli subsp. xyli) and in one inoculated test, the disease caused significant reductions in yield of cane (Mg ha") and total recoverable sugar per hectare (kg ha") in the first-ratoon crop. Plants of HoCP 85-845 have been found naturally infected with leaf scald [caused by Xanthomonas albilineans (Ashby) Dowson] in the field; however, infection levels were lower than in the commercial check, CP 74-383. HoCP 85-845 is resistant to infestation by the sugarcane borer, Diatraea saccharalis Fabricius; preliminary data suggest that the cultivar is also tolerant to damage when infested. Seed cane of HoCP 85-845 will be maintained at the Sugarcane Research Unit, USDA-ARS, Houma, LA.