Cocoa variety assessment in on-farm progeny trials in Cameroon

In Cameroon, IRAD and CIRAD have collaboratively set up and implemented a participatory breeding program since 2006, consisting in the assessment of cocoa varieties under cocoa farm conditions. The present communication describes the results obtained so far on progenies compared in three progeny trials set up in 2006 and 2007. The first trial, set up in 2006, is composed of 12 trial plots, and allows the comparative assessment of nine progenies which are currently released to farmers. Data analyses performed on yield and establishment ability showed high performances for the progeny issued from the cross IMC 67 * SNK 109 and low performances for the one issued from the cross T 79/501 * SNK 64. Data analyses performed on mirid damage scores revealed a higher level of susceptibility for the progeny issued from the cross IMC 67 * SNK 109 and a lower one for the progenies issued from the crosses T 79/501 * SNK 64 and IMC 67 * SNK 64. The assessed progenies showed a mean weight of one bean of dried cocoa ranging between 1,17g (SCA 12 * SNK 16) and 1,52g (SNK 109 * IMC 67). The second progeny trial, set up in 2006, composed of four trial plots, allows the comparison between 16 cocoa progenies, issued from: commercially released progenies, progenies recently created at IRAD, progenies issued from on farm selection of promising trees. Data analyses show a higher level of yield for the commercially released progenies and a lower level for progenies issued from on farm selection. Data analyses of tolerance to Phytophthora megakarya, assessed using a leaf inoculation test showed a slightly higher level of tolerance for the progenies recently created at IRAD. The third trial set up in 2007, is composed of six trial plots and allows the comparison between eight progenies: one recently created at IRAD, three commercially released progenies, two issued from on farm selection of promising trees, two issued from trees chosen at random in cocoa farms set up with traditional (german cocoa) or commercial cocoa progenies. Data analyses show a high level of yield for the progeny recently created at IRAD (T 60/887 * POUND 7) and a low level for the progeny issued from traditional varieties (german cocoa).

Bibliographic Details

Main Authors:	Sounigo, Olivier, Efombagn, Mousseni Ives Bruno, Feumba de Tchoua, L.F., Owono, B., Nsouga Amougou, F., Bourgoing, Raymond, Mekondane, R., Abolo, Dieudonné, Ten Hoopen, Gerben Martijn, Nyassé, Salomon, Eskes, Albertus
Format:	conference_item biblioteca
Language:	eng
Published:	s.n.
Subjects:	F30 - Génétique et amélioration des plantes, F01 - Culture des plantes,
Online Access:	http://agritrop.cirad.fr/568431/ http://agritrop.cirad.fr/568431/1/document_568431.pdf
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