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IMC 6    Theobroma cacao

 Pound, F.J. (1938)
Cacao and Witchbroom Disease of South America with notes on other species of Theobroma. Archives of Cocoa Research 1: pp. 26-71.

Derivation: Iquitos Mixed Calabacillo (Mid Channel).
Collected by Pound.
Location: Iquitos, Peru.

Pound, 1938a [POU38A]. Main type - very large lagarta calabacillo pods, oval, very smooth, normal blanco. Seeds large, flat, losenge shaped. 'Hybrid group'-large pods, somewhat warty at stem end but smooth and round like calabacillo at the apex. Third group-small, oval, warty pods, dense flowering. Bartley, 1995a [BAR95A]. The common features of this group of clones are the high ovule numbers (65+) and a specific type of anthocyanin pigmentation in the stamens and base of the corolla. Posnette, 1945a [POS45A]. Petioles are of a type intermediate between those of Nanay (see NA) and Parinari (see PA) types; the constriction is usually short and narrow.

Notes:  Pound, 1938a [POU38A]. Pods probably collected from at least two groups of trees which were free of Witches' Broom.

Bartley, 1995a [BAR95A]. They are probably the progenies of two trees, later propagated as the clones P 18 [POU] and P 21 [POU].

Pound, 1943b [POU43B]. 112 plants were planted at Marper farm.

Bartley, 1997a, [BAR97A] The progeny of the individual clones is not documented and it is important not to consider the IMC clones as one homogeneous group.



 Putative Half-Sibs:
Group P27   Zhang, D. et al., 2009
IMC 10 
IMC 105 
IMC 107 
IMC 11 
IMC 12 
IMC 13 
IMC 16 
IMC 18 
IMC 23 
IMC 27 
IMC 30 
IMC 33 
IMC 38 
IMC 42 
IMC 44 
IMC 47 
IMC 53 
IMC 55 
IMC 58 
IMC 59 
IMC 60 
IMC 61 
IMC 63 
IMC 65 
IMC 68 
IMC 71 
IMC 76 
IMC 77 
IMC 78 
IMC 85 
IMC 9 
IMC 96 
IMC 98 


 Motamayor, J.C. et al., 2008
'Iquitos' Population
Subgroup: 'IMC I'   Reference


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Current List   ICQC,R Website
• Accession: RUQ 761     ICQC,R 
   - Local Name: IMC 6
   - Year of Accession: 1997
List received in 2018   Reference
• Accession: 21891
   - Local Name: IMC-6
   - Year of Accession: 2005
List received in 1989   Reference
• Local Name: IMC 6
   - Year of Accession: 1977
List received in 2012   Reference
• Local Name: IMC - 6
   - Year of Accession: 1967
List received in 2012   Reference
• Local Name: IMC6
   - Year of Accession: 1974
List received in 2008   Reference
• Accession: VTLC 133
   - Local Name: IMC 6
List received in 2008   Reference
• Accession: IDN-13-TCAC-00547
   - Local Name: IMC6
List received in 1990   Reference
• Local Name: IMC 6
List received in 2011   Reference
• Local Name: IMC 6


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19.12 % Infection (Pod).
Note: percentage of infected pods. Rank calculated using Newman-Keuls test at 5% = BCD
 Sounigo, O. et al., 1995
Intermediate, sp. P. palmivora (Pod).
 Clement, D. & Sounigo, O., 1992
Moderately Susceptible, sp. P. palmivora (Pod).
Note: Unripe, Unattached and not wounded
 Iwaro, D., 1998
Susceptible, sp. P. palmivora (Leaf).
 Kebe, 1999


 K. F. N’Guessan et al., 2003
 Red Squirrel
Very Resistant (Sciurus granatensis)
 Warren, J. & Emamdie, D., 1993


 Frances Bekele & Gillian Bidaisee, 2022
Pod Index: 23.9 (pods per kg dried beans)
 Sounigo, O. et al., 1995
Yield: 1344 kg ha-1 yr-1


 Bartley, B.G.D., 1970
Size: medium
 Frances Bekele & Gillian Bidaisee, 2022
Colour: dark purple
Shape: ovate
Number: 53.0
Total Wet Weight: 63.8 g
Cotyledon Dry Weight: 0.79 g
Cotyledon Length: 20.8 mm
Cotyledon Width: 10.1 mm


 Frances Bekele & Gillian Bidaisee, 2022
Testa: 13.10 %
 Trinidad - CRU, 1998
Butterfat Content: 55.00 %
Testa: 6.40 %


 Bartley, B.G.D., 1970
Size: large
 Frances Bekele & Gillian Bidaisee, 2022
Shape: obovate
Basal Constriction: moderate
Apex Form: obtuse
Rugosity: slight
Length: 182.0 mm
Breadth: 91.0 mm
Colour: anthocyanin absent
Hardness: hard
Note: Hardness > 2.0 Mpa


 Fiona Lahive, 2017
Accession: RUQ 761
Light Saturated Photosynthetic Rate: 3.84 μmol m2 s-1
Stomatal Conductance: 0.08 mol m2 s-1
Transpiration Rate: 1.21 mmol m2 s-1
Intrinsic Water Use Efficiency: 51.94 μmol mol-1
Instantaneous Water Use Efficiency: 3.49 mmol mol-1
Flush Size: 5
Leaf Area: 399.80 cm2
Leaf Dry Weight: 2.59 g
Specific Leaf Area: 157.00 cm2 g-1


 Frances Bekele & Gillian Bidaisee, 2022
Colour: moderate anthocyanin


 Trinidad - ICGT, 1992
Distance from Base to Widest Part: 135 mm
Length: 288.0 mm
Width: 94.0 mm
Length to Width Ratio: 3.10
Basal Angle: 122.5 °
Apical Angle: 68.0 °
Petiole Length: 19 mm
Pulvinus Length: 15 mm


 Allen, J.B., 1988
Stamen Colour: slight anthocyanin
Sepal Colour: slight anthocyanin
Sepal Length: 8.50 mm
Ovary Colour: anthocyanin absent (apical)
Pedicel Colour: slight anthocyanin
 Frances Bekele & Gillian Bidaisee, 2022
Ligule Colour: anthocyanin absent
Stamen Colour: anthocyanin absent
Sepal Length: 7.05 mm
Ligule Width: 2.67 mm
Ovule Number: 52
Style Length: 2.47 mm
Pedicel Colour: reddish

Pound, F.J. (1938) Cacao and Witchbroom Disease of South America with notes on other species of Theobroma. Archives of Cocoa Research 1: pp. 26-71.
Zhang, D., Boccara, M., Motilal, L., Mischke S., Johnson, E.S., Butler, D.R., Bailey, B. & Meinhardt, L. (2009) Molecular characterization of an earliest cacao (Theobroma cacao L.) collection from Upper Amazon using microsatellite DNA markers. Tree Genetics & Genomes. doi:10.1007/s11295-009-0212-2
Motamayor, J.C., Lachenaud, P., da Silva e Mota, J.W., Loor, R., Kuhn, D.N., Brown, J.S. & Schnell, R.J. (2008) Geographic and Genetic Population Differentiation of the Amazonian Chocolate Tree (Theobroma cacao L). PLoS ONE 3(10): e3311. doi:10.1371/journal.pone.0003311
Allan Mata (2018) Accession list for the International Cacao Collection at CATIE (IC3). Personal communication.
Cote d'Ivoire - IRCC (1989) Liste des clones en collection. Unpublished Report, IRCC Bingerville, Cote d'Ivoire, Doc. No. 192. D. Clement, IRCC, Cote d'Ivoire. Personal Communication.
EET - Pichilingue (2012) Accessions planted in EET - Pichilingue, Ecuador. Freddy Amores and Ignacio Sotomayor C, personal communication, February 2012.
CRIG (2012) Cocoa accessions held in the Cocoa Research Institute of Ghana (CRIG). Francis Kwame Padi, personal communication, February 2012.
CPCRI (2008) Cocoa germplasm maintained at the Central Plantation Crops Research Institute (CPCRI) Regional Station, Vittal, India. Data supplied to ICGD by email. D. Balasimha, CPCRI Vittal, India, July 2008.
Susilo, A. (2008) The list of germplasm collected by ICCRI. Personal communication from Agung Susilo, July 2008.
Malaysia - ARC Tuaran (1990) List of clones held in the Dept. of Agriculture's collection, at Sabah, Tuaran, Malaysia. E.B. Tay, Malaysian Cocoa Board, Malaysia. Personal Communication.
CRU (2011) ICG,T accessions. CRU website.
Sounigo, O., N'Goran, J., Coulibaly, N., Clement, D. & Lachenaud, P. (1995) Evaluation de clones de cacaoyers pour la productivite, la resistance aux mirides et la resistance a la pourriture des cabosses. In: Proceedings of the 11th International Cocoa Research Conference, Yammoussoukro, Cote d'Ivoire, 1993. Cocoa Producers' Alliance, Lagos, Nigeria. pp. 375-381.
Clement, D. & Sounigo, O. (1992) Ivory Coast Database. D. Clement & O. Sounigo, IRCC, Bingerville, Cote d'Ivoire. Personal Communication.
Iwaro, D. (1998) Evalation of accessions for Black Pod. Personal Communication 30th October 1998. Data sent by email from Dr. Iwaro.
Kebe (1999) Data from Cote d'Ivoire on black pod resistance. Kebe, report on CAOBISCO project. Forwarded to ICGD by Dr. A.B.Eskes, IPGRI.
K. F. N’Guessan, A. B. Eskes & Ph. Lachenaud (2003) Etude de la Resistance du Cacaoyer aux Mirides : Classification des Grands Groupes de Cacaoyers en Fonction de Leur Niveau de Resistance ou Sensibilite. In: Proceedings of the 14th International Cocoa Research Conference, Accra, Ghana (October 2003). Cocoa Producers' Alliance, Lagos, Nigeria.
Warren, J. & Emamdie, D. (1993) Rodent resistance in cacao Theobroma cacao L. Tropical Agriculture (Trinidad), 70: pp.286-288
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.
Bartley, B.G.D. (1970) A preliminary catalogue of the cacao germplasm held at the University of the West Indies, Trinidad. University of the West Indies, St. Augustine, Trinidad.
Trinidad - CRU (1998) Fat Analysis Data. Data supplied on computer diskette by F. Bekele, CRU, Trinidad.
Fiona Lahive (2017) Phenotypic data from climate change trials. Personal communication.
Trinidad - ICGT (1992) Leaf descriptors. Unpublished data supplied on computer diskette by International Cocoa Genebank, Trinidad, University of the West Indies, Trinidad.
Allen, J.B. (1988) Geographical variation and population biology in wild Theobroma cacao. PhD. Thesis, University of Edinburgh, U.K. pp. 197.