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Morphometric and Allometric Variations of Trichodorus Christiei

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Variations existed within geographical isolates, populations, and strains of Trichodorus christiei Allen. Host species, host variety, host physiology, and geographical origin of a population influenced the extent of variation of morphometric and allometric characters. Stylet length was the least variable morphometric character. Ratios formed from the body length, stylet length and position of the vulva were the least variable allometric characters. It was shown that the variance of morphometric characters and the allometry of pairs of characters used to form ratios should be studied before they are used for taxonomic purposes. Ten morphometric and allometric characters of 1,371 specimens of T. christiei from 22 populations were evaluated with numerical analyses. Numerical affinities were shown between intraspecific groups and among the populations within each group.

Affiliations: 1: Canada Department of Agriculture, Research Station, Harrow, Ontario; 2: Department of Plant Pathology, Cornell University, Ithaca, New York, U.S.A


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