Influence of Temperature on Population Development of Eight Species of Pratylenchus on Soybean

Nelia Acosta, R. B. Malek


In a soil temperature study, population increase on 'Clark 63' soybeatt was most rapid at 30 C in Pratylenchus alleni, P. brachyurus, P. cofleae, P. neglectus, P. scribneri, and P. zeae and at 25 C in P. penetrans and P. vulnus. The last two were the only species that reproduced at 15 C. Populations of all species increased over the range of 20-30 C, except those of P. neglectus at 20 C and P. coffeae, which was not tested below 25 C. Only P. brachyurus, P. neglectus, P. scribneri and P. zeae reproduced at 35 C. At their optimum temperatures, P. scribneri exhibited the greatest population increase, 1248-fold, and P. penetrans the least, 32-fold. This is the first report of soybean as a host for P. vulnus. Key Words: Pratylenchus alleni, P. brachyurus, P. coffeae, P. neglectus, P. penetrans, P. scribneri, P. wtlnus, P. zeae, lesion nematodes, host-parasite relationships, ecology, susceptibility, Glycine max.

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