Studies on the interactions between three species of Acacia (Faidherbia albida Del., A-seyal Del., A-holosericea A Cunn. ex G. Don) and Meloidogyne mayaguensis in Senegal.

The susceptibility of three Acacia species used in Senegal (F. albida Del., A, seyal Del. and A. holosericea A Cunn. ex G. Don) to M. mayaguensis is studied after inoculation of the nematode at different stages of seedling development (seedling stage, cotyledon and young leaves). The observation of giant cells induced by M. mayaguensis on all three Acacia species testifies to their susceptibility to the nematode. However the pathogenic effect of M. mayaguensis on the growth of A. holosericea and A. sepal is more important than on F. albida. Moreover, the penetration and the development of the nematode is greater with these two Acacia species. The susceptibility of Acacia decreased when nematodes are inoculated on older seedlings. These results indicate that some Acacia sp, used to restore soil fertility will multiply parasites susceptible to infest subsequent crops.