DISPERSION AND DISTRIBUTION OF PRATYLENCHUS-SCRIBNERI AND HOPLOLAIMUS-GALEATUS IN SOYBEAN FIELDS

  • 1 January 1983
    • journal article
    • research article
    • Vol. 15  (3) , 418-426
Abstract
Examination of dispersional characteristics of P. scribneri and H. galeatus indicated that there were patches within soybean fields in which both survival and reproduction were enhanced in spite of apparent homogeneity of soil type and topography. Treatment with carbofuran reduced the patchiness (or increased the dispersion) for H. galeatus while it had the opposite effect for P. scribneri. P. scribneri was less highly dispersed in conventional tillage plots than in the zero tillage plots. Populations from quadrats contained entirely within the patches could be described by the normal distribution (in the case of P. scribneri) or by the Poisson distribution (in the case of H. galeatus), while populations from quadrats contained entirely outside the patches could be described by the Poisson distribution for both nematodes. None of the distributions tested (Poisson, normal, negative binomial, Neyman''s) gave an adequate fit when populations from both inside and outside the patches were considered together. In all instances, log10 and in transformations reduced the goodness of fit of the data to all of the distributions tested. Even with logarithmic transformations, parameteric statistics were not appropriate for analysis of data in most instances.

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