SEMINAR: NEMATODE SAMPLING AND PREDICTION BY B. BOAG, R. NEILSON and D. J. F. BROWN Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, Scotland The principles upon which soil samples are collected for assessing plant parasitic nematodes in the soil are assessed. The importance of identifying the objectives of the sampling programme and species of nematode to be studied is emphasised. The development of optimum sampling patterns and the evolution and application of different mathematical formulae to describe the horizontal aggregated distribution of nematodes are discussed. Keywords: sampling, Taylor's Power Law, semi-variograms, kriging, modelling. SAMPLING Before devising sampling procedures for plant parasitic nematodes the objectives must be clearly defined. These include the detection of nematodes for statutory regula- tions e.g. for potato cyst nematodes Globodera rostochiensis and G. pallida (Southey, 1974; Seinhorst, 1982; Wood et al., 1983; Cotton, 1991) and the quantification of nematode populations for assessing crop losses (Barker et al., 1984), national surveys (Boag et al., 1992) or monitoring pupulations changes (Allsopp, 1990). Interest in optimising sam- pling strategies is likely to become more important in the future, as regulations become more stringent and restrict the use of nematicides and soil sterilants. Apart from directly counting
Nematologica – Brill
Published: Jan 1, 1992
Keywords: semi-variograms; modelling; kriging; Taylor's Power Law; sampling
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