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TARS 31    Theobroma cacao

 Ricardo Goenaga, Heber Irizarry & Brian Irish (2009)
TARS Series of Cacao Germplasm Selections. HORTSCIENCE 44(3): 826-827

Derivation: USDA-ARS, Tropical Agriculture Research Station.
Location: United States.

Notes:  The TARS selections were made following multisite progeny trials at Corozal, Gurabo and Yabucoa in Puerto Rico and a further trial at Corozal to investigate the performance of the most promising 40 types when grafted onto an open-pollinated EET400 rootstock (randomised block design with six replications, each containing two experimental trees per treatment, evaluated over 4 years of production 1994-97 when the trees were 3 to 6 years old) (Irizarry and Rivera, 1998 and Irizarry and Goenaga, 2000)). The original progeny trials involved evaluation of the yield potential of 1320 trees representing five interclonal cacao full sib families (UF-668 x Pound-7, IMC-67 x UF-613, EET-400 x SCA-12, SCA-6 xEET62, and IMC-67 x SCA-12) over a period of 8 years (1986 to 1993) of production at two locations and 4 years (1986 to 1989) at a third location (edaphic/climate details below. Only 9 of the 40 clones selected for final evaluation demonstrated superior yield when compared with either the combined mean of the five parental clones or the mean of their highest yielding parent. Organoleptic evaluation of 65% cacao-containing chocolate samples from the highest yielding clones was conducted at Guittard Chocolate Company, Burlingame, CA, using the protocol of the CFC/ICCO/INIAP Flavor Project (Sukha et al., 2008).


SCA 6  x EET 62 [ECU]    Ricardo Goenaga et al., 2009


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Current List   ICQC,R Website
• Accession: RUQ 1394     ICQC,R 
   - Local Name: TARS 31
   - Year of Accession: 2003
List received in 2018   Reference
• Accession: 22111
   - Local Name: TARS-31
   - Year of Accession: 2007
List received in 2012   Reference
• Local Name: TARS31
List received in 2016   Reference
• Accession: PI 668458     GRIN-Global 
   - Local Name: CACAO TARS 31
   - Year of Accession: 2000
List received in 2010   Reference
• Accession: MIA 36203     GRIN-Global 
   - Local Name: TARS # 31 Selection
   - Year of Accession: 2002


 Ricardo Goenaga et al., 2009
Flavour: Interesting fruit tartness along with some astringency and a complex mildly floral with tropical fruit notes
Note: Flavor profile of 65% chocolate


 Ricardo Goenaga et al., 2009
Pod Index: 43.3 (pods per kg dried beans)
Yield: 2310 kg ha-1 yr-1
Yield (dry beans per tree): 1.54 kg


 Fiona Lahive, 2017
Accession: RUQ 1394
Light Saturated Photosynthetic Rate: 3.62 μmol m2 s-1
Stomatal Conductance: 0.05 mol m2 s-1
Transpiration Rate: 0.85 mmol m2 s-1
Intrinsic Water Use Efficiency: 73.57 μmol mol-1
Instantaneous Water Use Efficiency: 4.32 mmol mol-1
Flush Size: 7
Leaf Area: 219.60 cm2
Leaf Dry Weight: 1.55 g
Specific Leaf Area: 143.30 cm2 g-1


 Frances Bekele & Gillian Bidaisee, 2022
Colour: slight anthocyanin

Ricardo Goenaga, Heber Irizarry & Brian Irish (2009) TARS Series of Cacao Germplasm Selections. HORTSCIENCE 44(3): 826-827
Allan Mata (2018) Accession list for the International Cacao Collection at CATIE (IC3). Personal communication.
CRIG (2012) Cocoa accessions held in the Cocoa Research Institute of Ghana (CRIG). Francis Kwame Padi, personal communication, February 2012.
USDA, ARS Tropical Agriculture Research Station, Mayaguez, Puerto Rico. (2016) List of cocoa accessions held at Mayaguez in April 2016. USDA-ARS GRIN-Global. [Online Database] National Germplasm Resources Laboratory, Beltsville, Maryland.
USDA-ARS, SHRS, NCGR, National Germplasm Repository, Miami, Florida, USA. (2010) List of cocoa accessions held at Miami and Coconut Grove (Plant Introduction Station) in July, 2010. USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN). [Online Database] National Germplasm Resources Laboratory, Beltsville, Maryland.
Fiona Lahive (2017) Phenotypic data from climate change trials. Personal communication.
Frances Bekele & Gillian Bidaisee (2022) Morphological data from the International Cocoa Collection (ICG,T) maintained by the Cocoa Research Centre (CRC), Trinidad & Tobago. Unpublished data on fruit, bean, flower and flush morphology supplied as an Excel spreadsheet by Frances Bekele. Last update March 2022.