The efficiency of fosthiazate (Nemathorin ® 10G) was evaluated against plant-parasitic nematodes on bananas in 4 field trials in Martinique. In the first trial, two doses of fosthiazate (2.0 and 3.0 g a.i./mat) were compared with aldicarbe (Temik ® 10G), applied at 2.0 g a.i./mat. In the other studies, fosthiazate at 1.5 and 2.0 g a.i./mat were compared with alternate applications of 3 refèrence nematicides : cadusafos (3.0 g a.i./mat ), aldicarbe (2.0 g a.i./mat ) and fenamifos (3.0 g a.i./mat ). The burrowing nematode, Radopholus similis, was the dominant species, followed by the spiral nematode Helicotylenchus multicinctus in these 3 experiments while root-knot nematodes, Meloidogyne spp. dominate the nematofauna of the fourth trial and were significantly present in all sites. The lance nematode Hoplolaimus seinhorstii was only present at one site. Results showed that fosthiazate was as effective as the reference nematicides in two trials and significantly more efficient in the two others in the control of the burrowing nematode, R. similis. No difference was observed in the control of H. multicinctus while both doses of fosthiazate induced a significantly higher reduction of infestation by Meloidogyne spp. and H. seinhorstii when present. Thanks to better prevention of fall-over, fosthiazate has increased yield up to 35 % compared to reference plots.