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AbstractIn temperate climates, densities of plant-parasitic nematodes at or shortlybefore sowing are a useful predictor of their damage potential.Re-examination of data from nematode communities on upland rice in Côted'Ivoire showed that interpretation of nematode pest potentials and thedamage caused by either individual species, or by the community as a whole,is less simple. The numerical proportion of individual nematode specieswithin a plant-parasitic nematode community, comprising Heterodera sacchari,Pratylenchus zeae , Meloidogyne incognita, Helicotylenchus dihystera,Mesocriconema tescorum and Xiphinema spp., changed with duration of thecropping cycle. The relative importance to the crop of the different specieschanged with time, and with development of the community structure over thecourse of the season. Analysis suggested that for H.sacchari, the mid-seasonpopulation densities were most highly correlated with crop damage (yieldloss) and therefore its damage potential for that particular season. Thepest potential of other known rice pest species, such as M. incognita andP.zeae, was likely indicated earlier in the season, but the populationincrease of other nematode species in the community, particularly H.sacchari, compounded the interpretation of the data for other species. Theuse of single linear regression to assess the importance of individualnematode species conflicted with results of analyses using multiple stepwiseregression, while use of cluster analysis permitted the identification ofspecies groups at early and late stages in the cropping season.
Nematology – Brill
Published: Jan 1, 2002
Keywords: pathogenicity; yield loss.; west africa; oryza sativa; population dynamics; analysis
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