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The paper reviews the unfavourable environmental factors and technical difficulties that have limited the extensive use of vegetative propagation by rooted cuttings in multiplying cacao. Important among the external factors affecting rooting of cacao cuttings are light, temperature, humidity, and the air-moisture relations of the rooting media. The most important technical factors that affect rooting of cuttings are hormonal treatment, wounding, etiolation, and exogenous supply of carbohydrates and minerals to cuttings. These factors may influence rooting success in isolation or in combination with each other because it is often impossible to separate the effect of one factor from the other. The light intensity at which rooting occurs is dependent on temperature. The relative humidity within the propagation set-up is related to the light intensity and associated temperature. The effects of various media on rooting of cuttings are usually closely influenced by the temperature and water relations. The most effective hormonal treatment for cacao is a mixture of indole butyric acid (IBA) and naphthalene acetic acid (NAA) in equal proportions at a concentration dependent on the dipping time and the size of cutting. Wounding and etiolation are treatments which have been reported to improve rooting in most tree species, but have not had wider application in cacao propagation. Exogenous application of carbohydrates may improve rooting of cuttings. The need is for an effective manipulation of the external environment and a wider exploitation of some technical factors to improve on rooting in cacao. . Cet article fait une revision de facteurs environnementaux favorables et les diffecultes techniques qui ont limite l'utilisation extensive de propagation vegetative pour la multiplication de cacao. Inclus dans les facteurs exterieurs importante influenccant l'enracinement de boutures de cacao saont: la lumiere, la temperature, l'humidite et les relations d'air-humidite de substances de la prise de raines. Les facteurs techniques les plus importants qui influencent la prise de racines par les boutures sont le traitement hormonal, la coupe blessante, etiolement et la provision exogene de hydrates de carbone et de minerals. Ces facteurs pourraient influencer le succes de la prise de racines en isolement ou en combinaison l'un evec l'autre comme ce n'est pas souvent possible de separer l'effet d'un facteur de l'autre. L'intensite de lumiere a laquelle la prise de racines se produit depend de la temperature. L'humidite relative a l'interieur de l'instensite de la lumiere et a la temperature associes. Les effets des differents substances sur le plus souvent etroitement influences par les rapports de temperature et d'eau. Le traitement hormonal le plus efficace pour le cacao et une melange de IBA et NAA a parts egales d'une concentration dependant de temps d'enfoncement et les dimensions des boutures. La coupe blessante et l'etiolement sont des traitements qui ont ete annonce d'ameliorer la prise de racines en plusieurs especes d'arbre mais qui n'ont pas realise de plus grande application de propagation de cacao. L'application exogene de hydrates de carbone pourrait ameliorer la prise de racines de semis. Il y a la necessite d'une manipulation efficace de l'environnement exterieur et une exploitation plus grande de quelques facteurs techniques pour ameliorer la prise de racines de cacao. Ghana Journal of Agricultural Science Vol. 39 (2) 2006: pp. 217-226

Review of vegetative propagation of cacao (<i>Theobroma cacao</i> L.) by rooted cuttings. 2. Environmental and technical considerations