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This article in CS

  1. Vol. 35 No. 6, p. 1647-1651
    Received: Jan 3, 1995

    * Corresponding author(s): oujths@clust1.clemson.edu
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Host Suitability of Forage Grasses and Legumes for Root-Lesion Nematode Pratylenchus penetrans

  1. J. A. Thies ,
  2. A. D. Petersen and
  3. D. K. Barnes
  1. U SDA-ARS, U. S. Vegetable Laboratory, 2875 Savannah Highway, Charleston, SC 29414
    D ep. Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
    U SDA-ARS in Dep. Agronomy and Plant Genetics, Univ. of Minnesota



Pratylenchus penetrans reduces the productivity of many forage crops in northern USA and eastern Canada. Our objective was to determine the host suitability of forage grasses and legumes for P. penetrans in greenhouse, growth chamber, and field environments. In the greenhouse and growth chamber environments, P. penetrans reproduced on all forage grasses (17) and legumes (12). Both the legumes and grasses varied (P < 0.05) for numbers of nematodes and eggs in the roots. The most suitable hosts included kura clover (Trifolium ambiguum M. Bieb.), alsike clover (Trifolium hybridum L.), white clover (Trifolium repens L.), oat (Avena sativa L.), and rye (Secale cereale L.). The least suitable hosts included pearl millet [Pennisetum glaucum (L.) R. Br.], tall fescue (Festuca arundinacea Schreber), perennial ryegrass (Lolium perenne L.), forage sorghum [Sorghum bicolor (L.) Moench], sudangrass (Sorghum sudanense Pers.), sudex (Sorghum sudanenseS. bicolor), sweetclover (Melilotus alba Desr.), crownvetch (Coronilla varia L.), and MNGRN-16alfalfa (Medicago sativa L.). Twelve legumes and 9 grasses were transplanted into a field infested with P. penetrans and one-half the plants were treated with carbofuran (2,3-dihydro-2,2-dimethyl-7-benzofuranol methylcarbamate). Pratylenchus penetrans reproduced on all entries. Numbers of nematodes per gram fresh root of entries in the greenhouse-growth chamber and field tests were correlated for both the control (r = 0.60, P< 0.05) and carbofuran treatment (r = 0.48, P < 0.05). We concluded that many forage species are hosts for P. penetrans, but a few legumes and grasses are poor hosts and may be useful in forage rotations to reduce nematode populations.

Joint contribution from the USDA-ARS and the Minnesota Agric. Exp. Stn. Published as paper no. 21,461 of the contribution series of the Minnesota Agric. Exp. Stn. based on research-conducted under Projects 22–64 and 13–028, supported by USDA funds.

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