Niveau de parasitisme des hévéas par les Loranthaceae dans la région du Sud-ouest Cameroun

Objectif: La presente etude s’interesse au parasitisme des heveas par les Loranthaceae dans les plantations de la Cameroon Development Coorporation (CDC) de la region du Sud-ouest du Cameroun. Methodologie et resultats: L’etude a consiste a denombrer les especes de Loranthaceae parasitant les heveas, le nombre de touffes par individu parasite afin de determiner le taux ainsi que l’intensite du parasitisme dans les plantations. Les resultats montrent qu’une seule espece de Loranthaceae a ete rencontree dans les parcelles etudiees, Phragmanthera capitata . Le taux de parasitisme varie significativement du village Sonne (65 %) au village Likomba (51,53 %). Le clone PB 217 est le plus -parasite (65,08 %), tandis que le clone PR 107 est le moins parasite (48,31 %). Conclusion et application des resultats: Les types de voies d’acces jouent un role important dans la propagation du parasitisme. Il serait judicieux dans un premier temps, afin de mieux controler le parasitisme, de planter les clones les moins sensibles en bordure des plantations. Toutefois, des methodes de lutte efficaces devront etre mises sur pied afin d’ameliorer les rendements des plantations. Mots-cles : Heveas, Loranthaceae, parasitisme, sud-ouest English Title:  Parasitism of rubber trees by Loranthaceae in the South-west region of Cameroon English Abstract Objective: The present work consists in looking for characterizing the parasitism of the rubber trees by the  Loranthaceae in the plantations of the Cameroon Development Corporation (CDC) of the Southwest of Cameroon region. Methodology and results: The study consisted in counting the various species of Loranthaceae which lives as parasite on the seed fields, on the feet of infested rubber trees, and to determine the intensity of the parasitism of rubber trees. Results showed that only one species of Loranthaceae has been met in the studied areas. Phragmanthera capitata . The rate of parasitism varies from Sonne (65%) to Likomba villages (51,53%). The clone PB 217 was the most parasitized (65,08%), while the clone PR 107 was the less parasitized (48,31%). Conclusion and application of the results: The types of approach paths play an important role in the propagation of the parasitism. The clones least sensitive to the parasitism should be plant in border of the plantation to reduce the level of parasitism. However, appropriate control methods against the parasitism by Loranthaceae  should be sought to increase plantation yields. Keywords: Loranthaceae, parasitism, rubber tree, south-west