During a survey of the nematodes associated with weeds in banana fields in Martinique, 37 weed species in 34 genera and 19 familles were collected to extract nematodes from the roots. Result of this survey showed that at least 20 weed species were host of Radopholus similis. Besides some peculiar good R. similis reservoir (e.g. Phenax sonneratii) most of the other good R. similis reservoirs (e.g. Euphorbia heterophylla, Echinochloa colonna, Eleusine indica, Paspalum fasciculatum, Solanum torvum) were consistently found within 3 familles, the Euphorbiaceae, Poaceae and Solanaceae. Nematode densities varied from 4 to a maximum of 1896 adults and juveniles per gram of dry root (e.g. Echinochloa colonna) with an overall mean density of 192 per gram of dry root when present. These results showed that weeds can be very significant reservoirs of R. similis in banana fields. This information is crucial to devise future appropriate nematode control measures as rotation crops and fallow before re-plantation with nernatode free planting material.