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Morphology and morphometrics of pratylenchus brachyurus and pratylenchus zeae 2. influence of environmental factors



Morphology and morphometrics of pratylenchus brachyurus and pratylenchus zeae 2. influence of environmental factors



Indian Journal of Nematology 14(1): 6-17



Unfavorable host, overcrowding and high temperature decreased the body size of P. brachyurus and P. zeae. Nematodes of both species, from host roots grown on White's nutrient medium, were larger than those on Krusberg's or Carew's media. Other characters like head to excretory pore distance, total esophageal length, gonad and tail length also tended to vary in the same way as the body size in both species, although esophageal and tail lengths varied less than the body size. Stylet length varied little. Deman ratios a, b, b, c and Geraeit's ratio varied widely, and did not consistently exhibit a strong relationship. By contrast, the deMan V ratio and a new ratio designated P.O. varied little and showed a strong relationship.

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