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The Relation Between Nematode Distribution in a Field and Loss in Yield At Different Average Nematode Densities

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For more content, see Nematology.

Usually the relation between relative yield of plants y and nematode density P is well described by the arbitrary equation (1) y = m + (1-m)zP-T for P T, and y = 1 for P T, (m = relative minimum yield, z a factor < 1, T = the tolerance limit and z-T = 1.05 to 1.1). Only an average value for the nematode density in a field (P(av)) can be determined by investigating a soil sample. According to eq. (1) the relation between y and P is not linear. Therefore the relation between P (av) and yield depends on the distribution of the nematodes in the field. If the expected yield is estimated with the help of eq. (1) assuming m to be 0 and substituting P (av) for P losses are overestimated for P (av) 2 T. The over-estimation is greater the more the distribution of the nematodes differs from a random one. The relation between yield and average nematode density remains in accordance with eq. (1) for P < 100 T, but the value of m is higher the more irregular the nematode distribution.

Affiliations: 1: Institute of Phytopathological Research, Wageningen, The Netherlands


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