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The Distribution of Cysts of Globodera Rostochiensis in Small Plots and the Resulting Sampling Errors

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image of Nematologica
For more content, see Nematology.

Standard deviations of nematode counts in soil samples depend on numbers present in the sample. To obtain a certain predetermined standard deviation, sample sizes must be adapted to the statistical distribution of counts per sample at the expected density. Differences in counts of cysts of Globodera rostochiensis between samples from plots of one m2 in nine field experiments in different years and localities and on different soil types could be split into two components, one due to density gradients and one to sampling error. Gradients of log density could be considered to be constant in ranges of eight to sixteen plots. Deviations of cyst counts from densities according to linear regression lines of cyst counts upon distance of plots from the beginnings of the rows were in accordance with a negative binomial distribution of cyst counts in samples (probability generating function (q-p)-k with k = about 39 at an average sample size of 1.3 kg and, therefore, of about 45 for samples of 1.5 kg. The maximum estimate of the coefficient of variability of numbers of cysts counted in samples of 1.5 kg, therefore, is 16.5% at cyst counts of > 200 per sample. The value of k was the same for samples taken before planting and, in the same field after lifting of the potatoes. Apparently, it was also largely independent of cyst density and soil type.

Affiliations: 1: Research Institute for Plant Protection, Wageningen, Netherlands


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