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MO 83    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: river MOrona.
Collected by Pound.
Location: R. Morona, Peru.

Pound, 1938a [POU38A]. Fruit - Short, oval, warty, some types with red tint.

Notes:  Collected in 1937.

Pound, 1938a [POU38A]. Pods may have been collected from one tree with no Witches Broom infection.

Bartley, 1993a [BAR93A]. It is likely that accessions recorded with high numbers (>100?) are probably MOQ accessions since Pound, 1943b [POU43B] states that 80 plants were planted at Marper farm.
 

Synonyms: MORONA 83

 HELD IN

 Trinidad and Tobago, International Cocoa Genebank, Trinidad (ICG,T)
List received in 2011   Reference
• Local Name: MO 83

Moderate Resistance, sp. P. palmivora (Pod).
Note: Score: 3 (1-8 Scale). Fully grown, unripe detached pods (4-5 months old).
 A.D. Iwaro et al., 2006

Pod Index: 39.7 (pods per kg dried beans)
 Reference

Colour: dark purple
Shape: ovate
Number: 36.0
Total Wet Weight: 42.2 g
Cotyledon Dry Weight: 0.70 g
Cotyledon Length: 18.9 mm
Cotyledon Width: 12.0 mm
 Reference

Testa: 8.00 %
 Reference

Shape: elliptical
Basal Constriction: strong
Apex Form: acute
Rugosity: moderate
Length: 157.0 mm
Breadth: 67.0 mm
Colour: anthocyanin absent
Hardness: soft
Note: Hardness <= 1.6 Mpa
 Reference

Colour: slight anthocyanin
 Reference

Ligule Colour: slight anthocyanin
Stamen Colour: slight anthocyanin
Sepal Length: 7.32 mm
Ligule Width: 2.22 mm
Ovule Number: 45
Style Length: 2.26 mm
Pedicel Colour: red
 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.
CRU (2011) ICG,T accessions. CRU website.
A.D. Iwaro, D.R. Butler & A.B. Eskes (2006) Sources of resistance to Phytophthora pod rot at the International Cocoa Genebank, Trinidad. Genetic Resources and Crop Evolution (2006) 53: 99–109
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 Unpublished data on fruit, bean, flower and flush morphology supplied as an Excel spreadsheet by Frances Bekele.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.