PLANT-PARASITIC NEMATODE DIVERSITY AND PREVALENCE IN TRADITIONAL UPLAND RICE IN IVORY-COAST - PRELIMINARY-OBSERVATIONS ON THE EFFECTS OF CROPPING INTENSIFICATION
Dl. Coyne et al., PLANT-PARASITIC NEMATODE DIVERSITY AND PREVALENCE IN TRADITIONAL UPLAND RICE IN IVORY-COAST - PRELIMINARY-OBSERVATIONS ON THE EFFECTS OF CROPPING INTENSIFICATION, Fundamental and applied nematology, 21(6), 1998, pp. 723-732
This study compares nematode prevalence in upland rice fields, which d
iffered in cropping intensity, in three agroecological zones of Ivory
Coast. Eighty nematode species from 35 genera were found associated wi
th rice. Population densities of Helicotylenchus spp. were significant
ly lower in long fallows in the forest zone, but the mean population d
ensities of all other nematode genera and species did not differ signi
ficantly between fallow regimes in any of the three agroecologies. Mea
n nematode population densities exhibited a trend, decreasing, under l
onger fallows in the forest and savannah zones. Nematode diversity was
greatest in the forest-savannah, decreased in the savannah and was le
ast in the humid forest. The population density and prevalence of some
nematode genera differed between agroecologies. Of the known pests of
rice, Meloidogyne spp. were most prevalent in the forest, whilst Prat
ylenchus spp. were more prevalent in the forest-savannah and savannah.
Heterodera spp. occurred in the forest and forest-savannah, but its p
revalence was low. (C) Orstom/Elsevier, Paris.