Sugarcane Cultivar CP 88-1762

Descriptive terms that apply to sugarcane cultivar CP 88-1762 are presented in Table 1.

This is a large stalk cane that has higher-than-average sugar and high plant populations. It is subject to lodging and is difficult to harvest. CP 88-1762 is not a principal cultivar (cultivar with >1% of total sugarcane acreage) anymore in Florida (VanWeelden et al. 2021) and the main reason of decline in its acreage is susceptibility to orange rust (caused by Puccinia kuehnii). However, growers are still growing it as a niche cultivar because of its excellent growth characteristics (tillering, ratooning) and resistance to the other major sugarcane diseases in Florida. 

Glossary of Terms Used in Table 1

Cultivar Name: The first two letters in the cultivar name represent the source of the cultivar. CL stands for United States Sugar Corporation research farm in Clewiston, Florida; CP stands for Canal Point, Florida. This is where the cooperative sugarcane cultivar development program takes place. The participants are USDA-ARS, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS), and the Florida Sugar Cane League, Inc. The next two numbers represent the year the first clonal crop of a given cross was planted (CP clones), or the year seedlings were first planted (CL clones). The numbers after the hyphen represent the accession number of that cultivar in the year it was named.

Soil Preference: Describes soils where the best performance of this cultivar can be expected. Under Florida conditions, this refers to either sand, organic (muck), both, or transitional soils. Transitional soils are organic soils that contain a large percentage of sand, or sand soils that contain a percentage of organic matter.

Sugar Content: This is an estimate based on comparisons with other commercial cultivars made at the UF/IFAS Everglades Research and Education Center. Because a range of values makes up a rating category, cultivars with the same rating are not necessarily equal. Ratings change as the harvest season progresses and are one of the determining factors of preferred harvest season. Rated as low, medium, or high.

Tonnage: Based on harvesting experiences over several years. This is a relative term and is influenced by soil type, location, harvest season, and ratoon being harvested. Rated as low, medium, or high.

Leaf Width: Measuring the widest part of the leaf at the fourth node from the top. Expressed as wide, medium, or narrow.

Sheath Pubescence: Using young sheaths at the top of the plant, rated as none, sparse, or dense.

Leaf Retention: Dead leaves may be tightly retained giving a trashy appearance, may be held on but easily shaken off, or may be self-stripping. Rated as attached, loosely attached, or self-stripping.

Canopy Characteristics: Canopy characteristics vary from compact to open, which influence sunlight penetration and sucker growth. Canopy growth habit can be classified as erect, erect with drooping tips, high arch, medium arch, or wide arch.

Canopy Closure: Speed of canopy closure influences weed and sucker growth. Rated as slow, intermediate, or fast.

Tillering: The number of shoots from a stool strongly influences potential yield. Number of tillers rated as low, medium, or heavy.

Stalk Size: Diameter relates to cane weight and susceptibility to lodging or bending. Rated as small, medium, or large.

Exposed Stalk Color: Rated as yellow, green, wine, red, purple, brown, or a described color.

Stubbling Ability: This is the ability of a cultivar to regrow after harvest. It may be strongly influenced by the height of the cutter blade above the soil line. Rated as poor, fair, or good.

Harvest Season: Harvest begins in late October and concludes in late March to early April. Some cultivars produce high sugar early which declines with bloom, some reach their peak later in the season, while others maintain a relatively high sugar content for an extended period. A narrow window of optimum harvest limits the flexibility needed for an orderly harvest operation and could be considered a disadvantage. If a cultivar's optimum harvest season is limited, but it fills an industry need for a cultivar during that time frame, it would be considered an advantage. However, it would be a disadvantage if a late maturing cultivar was also freeze susceptible. Rated as early (10/15–12/1), mid (12/1–1/25), or late (1/25–3/15).

Harvestability: Some cultivars grow very erect while others are prone to fall over (lodge). The erectness and degree of lodging influences the ability of mechanical harvesters to cleanly harvest a field in a timely manner. Often a cultivar will lodge uniformly in one direction and can be successfully "peeled" away from the adjoining row during harvest if it does not break. Rated as easy, moderate, or difficult. (Peel: To harvest a field from the direction from which the wind blew the cane down. If the cane is lying to the south, harvest the field from the north, working across the field to the south.)

Cold Tolerance: This has to do with the length of time a variety is able to maintain economic quality after a freeze. Rated as poor, medium, or good.

Frost Tolerance: This has to do with the ability of young cane to withstand or regrow after exposure to one or more frosts. Rated as poor, medium, or good.

Mechanically Cut Seed: Ease with which a cultivar can be harvested with a whole stalk harvester. The stalks are laid in furrows either by hand or machine and then cut into billets by hand. The other mechanical planting option is a billet planter, which chops the cane as it is harvested, creating more cuts and eye damage than the whole stalk harvester. Rating here is for the whole stalk method unless otherwise stated. Rated as poor, medium, or good.

Disease Concerns: After release, cultivars are considered to have adequate disease resistance to all of the important diseases recognized by the industry at that time. Therefore, disease concerns listed are the result of new strains of common diseases, or new diseases that have become important.

Advantages: A reason to plant this cultivar (e.g., high water table tolerance).

Disadvantages: A reason to plan carefully when considering this cultivar for planting (e.g., frost susceptibility).

Acknowledgements

The authors wish to thank Florida Crystals Corporation and Norman Harrison for assistance with cultivar photographs, and Serge Edme and Barry Glaz from the USDA/ARS Sugarcane Field Station and Barney Eiland and Raul Perdomo from Florida Crystals Corporation for their contributions and reviews.

Reference

VanWeelden, M. T., S. Swanson, W. Davidson, M. Baltazar and R. Rice. 2021. "Sugarcane variety census: Florida 2020." Sugar Journal 84(2): 6-15.