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A l\'instar de la pyriculariose foliaire, celle du cou provoque d\'importantes pertes de recolte en riziculture, en Cote d\'Ivoire. Toutefois, contrairement a la premiere, pour laquelle il existe plusieurs methodes de selection pour la resistance varietale, l\'evaluation des genotypes de riz vis-a-vis de la pyriculariose du cou reste problematique au champ. Une technique de selection pour la resistance a cette maladie au champ a ete proposee, pour combler cette lacune. L\'objectif vise, a court terme, est de proposer aux riziculteurs, desvarietes de riz pour une protection complete contre la pyriculariose. Les resultats montrent que la methode est fiable. En effet, elle a permis, non seulement, de reduire voire d\'annuler les biais eventuels lies a la difference de cycle entre les genotypes, mais egalement, d\'evaluer ces varietes de riz quelle que soit la pression epidemique. En outre, elle a permis d\'apprecier le comportement du materiel vegetal face a la pyriculariose foliaire. Par ailleurs, ces resultats ont confirme qu\'une variete de riz resistante a la pyriculariose foliaire, ne l\'est pas systematiquement a la pyriculariose du cou. Neck blast like leaf blastcauses important yield losses in rice yield in Cote d\'Ivoire. However, as opposed to leaf blast , for which there are several screening methods, field evaluation of rice genotypes towards neckblast remains problematic. A breeding method for resistance to rice neck blast was developed to help fill the gap. The ultimate objective of the study is to select rice varieties exhibiting complete protection against blast disease (resistance to both leaf blast and neck blast). Results show that the method was reliable. Indeed, the method reduced and, even eliminated any error due to the cycle of the different genotypes. Furthermore, it allowed the assessment of rice varieties regardless of epidemic pressure of the rice neck blast pathogenand the behavior of the crop towards leaf blast. It was finally confirmed that a rice variety resistant to leaf blast was not necessarily resistant to neck blast. Keywords : Pyriculariose du cou, evaluation au champ, pyriculariose foliaire, riz, Cote d\'Ivoire. Agronomie Africaine Vol. 18 (2) 2006: pp.165-173

Evaluation de la résistance de variétés de riz (<i>Oryza sp.</i>) à la pyriculariose du cou au champ