Registration of ‘CIANO Cocorim‐92’ Cotton

'CIANO Cocorim-92' cotton (Gossypium hirsutum L.) (Reg. no. CV-105, P1570666) was developed and released in 1992 by the Cotton Improvement Program of the Yaqui Valley Experiment Station (Centro de Investigaciones Agrfcolas del Noroeste [CIANOJ-Instituto Nacional de Investigaciones Forestales y Agropecuarias [INIFAP]), Cd. Obregon, Sonora, as a stormproof, high-yielding cultivar with enhanced earliness and improved fiber strength and is adapted for production in northeast and northwest Mexico. CIANO Cocorim-92 was derived from the cross Stripper 61-28/Ca 1012. Stripper 61-28 is an early-maturing experimental strain from Arkansas, later released and renamed 'Quapaw'. Ca 1012 is an early-maturing strain developed on the Texas High Plains at Lubbock. Plant selection was carried out initially, from F2 through F4, by L.M. Verhalen, at Oklahoma State University, Stillwater, OK, using the pedigree method. CIANO Cocorim-92 originated from subsequent individual plant selections (designated as M72-117-10-3-206) in the Yaqui Valley, and was bulked in the F» generation. CIANO Cocorim-92 is a cluster-type cultivar, with a semipubescent stem and with short internodes on both sympodial and monopodial branches; height of the first square is 15 cm. Mature plants of this cultivar average 95 cm in height. Leaves are small and intermediate in pilosity. At the peak of boll formation, plants tend to bend over, due to their heavy boll load, but as boll opening proceeds, plants return to their former erect position. CIANO Cocorim-92 has white-creamy flowers; capsules have four or five locules, with some pubescence on sepals. Bolls are rounded and their average size is 5.9 g seedcotton per boll. Seed index (weight in grams per 100 seed) averages 11.4 g. CIANO Cocorim-92 is an early-maturing cultivar. It outyields 'Deltapine 80', which is the regional check, and is slightly better than 'Deltapine 50' when seeded during the first 2 wk of March; it begins flowering about 75 to 78 d (670 heat units) after planting and reaches blooming peak at 95 to 100 d; boll opening starts about 115 to 120 d after planting and peaks around 135 to 140 d. Lint yield at first pick averages 73%, compared with 50% for the local check cultivar Deltapine 80. CIANO Cocorim-92 has an average fiber length of 2.70 cm, its fiber strength is 582 MPa, and its micronaire reading averages 4.7 units. CIANO Cocorim-92 was tested in the Yaqui Valley, Sonora, over 3 yr and averaged 1470 kg ha" of lint. It outyielded Deltapine 80 by 11.7%. CIANO Cocorim-92 was validated on farmers' fields in the Yaqui Valley over 2 yr and averaged 1680 kg ha" of lint. It outyielded the check cultivar by 45.3% in 1990 and 5.5% in 1991. CIANO Cocorim-92 was tested in the National Elite Test in 1991 and averaged 1490 kg ha" of lint. It outyielded the check cultivars Deltapine 80 (four tests) and Deltapine 50 (one test), by 1.9 and 15.5%, respectively. Seed of CIANO Cocorim-92 was distributed to seed-producing organizations in Sonora in 1992. Breeder seed will be maintained by CIANO, Apartado Postal 515, 85000 Cd. Obregon, Sonora, Mexico. More detailed information on the performance and characteristics of CIANO Cocorim-92 is available (1).