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Effects of bare fallow on plant parasitic nematodes in the sahelian zone of senegal



Effects of bare fallow on plant parasitic nematodes in the sahelian zone of senegal



Revue de Nematologie 9(1): 75-82



Scutellonema cavenessi Sher populations declined linearly with time under bare fallow treatments in greenhouse and field studies. Final population levels in field plots in the Sahelian zone of Senegal following five months of bare fallow ranged from 0.6-3.2% of final population levels in natural fallow plots, depending on cultivation schedule. The ability of S. cavenessi to survive soil desiccation (a natural, annual occurrence in the Sahel) was inversely related to the number of desiccation cycles experienced. The ability to survive soil desiccation was described by a logarithmic decay function of duration in bare fallow conditions. Metabolic or food reserves in S. cavenessi were estimated by a visual index of intestinal region transparency. These estimates were closely related to cultivation schedule by a straight-line log relationship (r2 = 0.98**) and to the ability to survive soil desiccation by a logistic model (r2 = 0.80*). Several other phytoparasitic nematode species exhibited trends similar to S. cavenessi, although their population levels under bare fallow treatments remained proportionately higher than S. cavenessi with respect to populations in natural fallow plots.

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Accession: 005291964

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