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This article in CS

  1. Vol. 51 No. 1, p. 370-380
     
    Received: Mar 19, 2010
    Published: Jan, 2011


    * Corresponding author(s): dapotter@uky.edu
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doi:10.2135/cropsci2010.03.0163

Does Modification of Tall Fescue Leaf Texture and Forage Nutritive Value for Improved Livestock Performance Increase Suitability for a Grass-feeding Caterpillar?

  1. Craig P. Keathley and
  2. Daniel A. Potter *
  1. Dep. of Entomology, S-225 Agriculture Science Bldg. N, University of Kentucky, Lexington, KY 40546-0091. This work was supported by USDA FAPRU grant number 6440-21000-001-00. This is paper number 10-08-007 of the Kentucky Agricultural Experiment Station

Abstract

Grass breeders are developing new forage-type tall fescue [Schedonorus arundinaceus (Schreb.) Dumort = Lolium arundinaceum (Schreb.) Darbysh., formerly known as Festuca arundinacea Schreb.] cultivars with smoother texture, improved nutritive value, and reduced fiber for improved livestock performance. We tested if such grasses are also more susceptible to a grass-feeding caterpillar. True armyworms, Pseudaletia unipuncta (Haworth), were reared from first instar to adult on grass clippings from thirteen fescue cultivars or accessions differing in texture (smooth vs. standard), ecotype (northern European vs. Mediterranean), use (pasture vs. turf-type), or provenance to clarify how modifying the texture (edge spines, trichomes, or cellulose margin), thickness, tissue strength, and nutritive value (dry matter, fiber, ash, or N) of pasture grasses will affect their resistance. We also studied feeding site initiation and development of first instars on intact leaf blades when prevented from exploiting a cut leaf edge. Larvae performed equally well across all groups when reared with grass clippings, despite variation in leaf texture and nutritive value. On intact blades, however, leaf thickness and tissue strength were correlated with reduced feeding site initiation and larval development. Gregarious and window feeding may allow more efficient exploitation of common feeding sites on tougher leaves. True armyworm is adapted to feed on a range of structurally-diverse grasses, so increased use of forage-type tall fescue cultivars with smoother texture or reduced fiber is unlikely to worsen its damage to pastures.

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