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An Examination of the Efficiency of the Cobb Decanting and Sieving Method1)

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For more content, see Nematology.

The efficiency of the Cobb decanting and sieving method was studied quantitatively. The percentage of Pratylenchus penetrans extracted from fine sandy loam varied with the weight of the soil sample, the size of the particles in the mineral fraction, and the population density. Xiphinema americanum, Paratylenchus hamatus, and P. penetrans were recovered from three types of soil and from water. The lowest percentage of nematodes recovered, regardless of the species, was from fine sandy loam followed in order by clay, sand, and water. The percentage of X. americanum extracted was greater than of P. hamatus and of P. penetrans except from fine sandy loam. The percentage of P. hamatus extracted was intermediate.

Affiliations: 1: Canada Department of Agriculture, Vineland Station, Ontario, Canada


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