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IMC 18    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, PER.

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.
 

Synonyms: IQUITOS MIXED 18

 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.

 PEDIGREE DETAILS

 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 23 
IMC 27 
IMC 30 
IMC 33 
IMC 38 
IMC 42 
IMC 44 
IMC 47 
IMC 53 
IMC 55 
IMC 58 
IMC 59 
IMC 6 
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 

 POPULATION

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

 HELD IN

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List received in 1994   Reference
• Local Name: IMC 18
   - Year of Accession: 1992
List received in 1998   Reference
• Local Name: IMC 18
   - Year of Accession: 1992
List received in 2011   Reference
• Local Name: IMC 18

 YIELD

 Frances Bekele & Gillian Bidaisee, 2016
Pod Index: 27.0 (pods per kg dried beans)
 Reference

 BEAN

 Bartley, B.G.D., 1970
Size: medium
 Reference
 Frances Bekele & Gillian Bidaisee, 2016
Colour: dark purple
Shape: elliptical
Number: 57.0
Total Wet Weight: 55.1 g
Cotyledon Dry Weight: 0.65 g
Cotyledon Length: 20.7 mm
Cotyledon Width: 11.3 mm
 Reference

 FRUIT

 Bartley, B.G.D., 1970
Size: large
 Reference
 Frances Bekele & Gillian Bidaisee, 2016
Shape: elliptical
Basal Constriction: slight
Apex Form: indented
Rugosity: slight
Length: 150.0 mm
Breadth: 83.0 mm
Colour: anthocyanin absent
Note: Pod wall hardness > 2.0 MPa
 Reference

 FLOWER

 Frances Bekele & Gillian Bidaisee, 2016
Ligule Colour: moderate anthocyanin
Stamen Colour: intense anthocyanin
Sepal Length: 7.71 mm
Ligule Width: 2.84 mm
Ovule Number: 53
Style Length: 2.27 mm
Pedicel Colour: reddish
 Reference

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
Malaysia - ARC Tuaran (1994) Accessions in the Malaysian Cocoa Board collection obtained from USDA Mayaguez since 1991.. M.T. Lee, MCB, Malaysia. Personal Communication.
Malaysia - ARC Tuaran (1998) Accessions held in the Malaysian Cocoa Board collection, May 1998.. K. Lamin, MCB, Malaysia, Personal Communication.
CRU (2011) ICG,T accessions.. CRU website.
Frances Bekele & Gillian Bidaisee (2016) Morphological data from the International Cocoa Collection (ICG,T) maintained by the Cocoa Research Centre (CRC), Trinidad & Tobago.. Unpublished data on fruit and flower morphology supplied as an Excel spreadsheet by Frances Bekele, April 2016.
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.