TAILIEUCHUNG - Article bibliographique

More than one hundred species of nematodes have been reported from upland and paddy rice in many countries (Tab. 1). Their frequency and importance are very variable and, in most cases the existence of a parasitic relationship with rice is probable but has not been demonstrated. Many species of root nematodes have been observed both in dry and irrigaftieldd s but very few species are found in both situations. Several surveys made by the authors in WAefrsitc a have shown that a relatively low number of species are adapted to permanently flooded conditions. When the field is only temporarily flooded, the number of species present is higher and the nematode fauna tends to ressemble. | Article bibliographique ROOT-PARASITIC NEMATODES OF RICE Renaud Fortuner and Georges Merny ORSTOM Laboratoire de Nématologie . V 51 Abidjan Côte d Ivoire and ORSTOM Laboratoire de Biologie des Sols 70-74 route d Aulnay 93140 Bondy France Geographical distribution of nematodes associated with rice More than one hundred species of nematodes have been reported from upland and paddy rice in many countries Tab. 1 . Their frequency and importance are very variable and in most cases the existence of a parasitic relationship with rice is probable but has not been demonstrated. Many species of root nematodes have been observed both in dry and irrigated fields but very few species are found in both situations. Several surveys made by the authors in West Africa have shown that a relatively low number of species are adapted to permanently flooded conditions. When the field is only temporarily flooded the number of species present is higher and the nematode fauna tends to ressemble that observed in upland rice fields which is composed of species also common in other crops. Unfortunately in many papers the authors fail to indicate with what kind of rice paddy or upland rice the parasite was associated. Nematodes attacking roots can be divided into three categories. Migratory endoparasites The most important migratory endoparasites associated with paddy belong to the genus Hirschmanniella of which several species have been observed associated with rice. H. oryzae is the most frequently encountered in all countries where rice is grown except Europe. Another species H. spinicaudata is common in West Africa and has been observed once in South America. In West Africa a geographical gradient is observed in the distribution of both species H. spinicaudata is highly prevalent in the humid countries .like Ivory Coast whereas H. oryzae is found mostly in the Sahelian regions North Senegal a balanced mixture of both species is observed in intermediate geographical areas Gambia . Ten .

• Nông nghiệp
• Geographica
• Nemafodes
• Laboratoire
• ECTOPARASIT
• R
• Fortuner
• Hirschmanniella oryzae