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Objectifs: Face aux attaques graves d’anthracnose sur D. alata au Togo et en vue de developper une methode de lutte efficace et durable, ce travail se propose d’evaluer la resistance de differents cultivars de l’igname au Colletotrichum gloeosporioides , l’agent pathogene de la maladie. Methodologie et resultats: La severite et l’incidence de l’anthracnose ont ete evaluees sur 14 varietes locales et 10 varietes ameliorees de D. alata , au champ en conditions d’infection naturelle et en serre par inoculation utilisant deux isolats de C. gloeosporioides , suivant un dispositif en blocs aleatoires avec 3 repetitions. Une difference hautement significative a ete observee entre les varietes pour la severite de l’anthracnose au champ (P=0,006) et en serre (P<0,001). La classification ascendante hierarchique (CAH) des severites moyennes de l’anthracnose, a indique que les varietes locales Kabanga, Kefou, Tsrokpa, Lotossou et les varietes ameliorees TDa 99/00199, TDa 99/00169, Hawai, ont ete tolerantes. Conclusion et application des resultats: 4 varietes locales et 3 des varietes ameliorees se sont montrees tolerantes a l’anthracnose et pourront, apres des tests multilocaux, etre distribuee directement aux producteurs pour le controle de la maladie ou servir de parents pour l’amelioration varietale de D. alata contre cette maladie. Ces resultats suggerent que, malgre la forte pression de C. gloeosporioides dans les zones de production de D. alata , il existe des sources de resistance a l’Anthracnose au sein des populations de cette espece d’igname au Togo. Cela suggere la necessite de poursuivre les criblages des ignames en vue de repertorier d’autres sources de resistance a l’Anthracnose presente dans le pays qu’on pourra exploiter pour lutter efficacement et de facon durable contre la maladie. Mots cles: Anthracnose, Colletotrichum gloeosporioides , varietes de D. alata , resistance English Title: Screening of D. alata varieties grown in Togo for resistance to yam anthracnose caused by Colletotrichum gloeosporioides English Abstract Objectives: Facing severe attacks of anthracnose on D. alata in Togo and in order to develop an effective and sustainable control method, this work aims to evaluate the resistance of different cultivars of yams to Colletotrichum gloeosporioides , the pathogen of the disease. Methodology and Results: Severity and incidence of anthracnose were assessed on 14 local and 10 improved varieties of D. alata in field under natural infection conditions and in greenhouse by inoculation using two isolates of C. gloeosporioides . Trials were arranged in random blocks with 3 repetitions. A highly significant difference was observed between the varieties for the severity of anthracnose in the field (P = 0.006) and in the greenhouse (P <0.001). The hierarchical ascending classification (CAH) of the anthracnose severity average indicated that the local varieties Kabanga, Kefou, Tsrokpa, Lotossou and the improved varieties TDa 99/00199, TDa 99/00169, Hawaii, were tolerant. Conclusion and application of results: 4 local varieties and 3 improved varieties were tolerant to anthracnose and could, after multilocal tests, be distributed directly to the producers for the control of the disease or serve as parents for the varietal improvement of D. alata against this disease. These results demonstrate that, despite the high pressure of C. gloeosporioides in the production areas of D. alata , there are sources for resistance to anthracnose in populations of this yam species in Togo. This suggests the need to continue yam screening to identify other sources of resistance to anthracnose present in the country that can be exploited to control effectively and sustainably the disease. Keywords: Anthracnose, Colletotrichum gloeosporioides , D. alata varieties, resistance

journal of applied biosciences

Criblage de variétés de &lt;i&gt;Dioscorea alata&lt;/i&gt; cultivées au Togo, pour leur résistance à l’anthracnose de l'igname causée par &lt;i&gt;Colletotrichum gloeosporioides&lt;/i&gt;