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Sunflower stem weevil and its larval parasitoids in the Central and Northern Plains of the USA

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Abstract

The sunflower stem weevil, Cylindrocopturus adspersus (LeConte) (Coleoptera:Curculionidae), is apest of cultivated sunflower (Helianthusannuus L) from the southern to the northernGreat Plains. The incidence of weevilinfestation in fields from the six differentstates sampled during 1996 and 1997 ranged from33% (Minnesota) to 100% (Kansas, Colorado,Nebraska). Weevil populations in the fieldssampled were statistically greater in thecentral Plains (Colorado, Kansas, Nebraska)with a mean of 12.3 and 19.5 larvae per stalkcompared with the northern Plains (North andSouth Dakota, Minnesota) of 0.7 and 1.3 larvaeper stalk in 1996 and 1997, respectively.Parasitization of weevils varied from field tofield ranging from 1 to 100%, but was usuallyless than 20%. The nine species oflarval parasitoids recovered were allHymenoptera and included: Nealioluscurculionis (Fitch), N. collaris(Brues), Bracon sp. (Braconidae); Neocatolaccus tylodermae (Ashmead), Chlorocytus sp., Pteromalus sp.(Pteromalidae); Quadrastichus ainslieiGahan (Eulophidae), Eurytoma tylodermatisAshmead (Eurytomidae); and Eupelmus sp.(Eupelmidae). Nealiolus curculionis wasthe most prevalent parasitoid reared from C. adspersus, and it was recovered from allstates sampled. Parasitoid species richness wasgreatest in the central Plains. Thereduced number of parasitoid species foundattacking C. adspersus in the northernPlains may be caused by low host populationlevels, slow migration by parasitoids into theregion, or lack of adaptation to climaticconditions. Additional work to understandthe population dynamics of the parasitoidcomplex associated with C. adspersus mayresult in improved biological control of thesunflower stem weevil in cultivatedsunflower.

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Authors and Affiliations

  1. Northern Crop Science Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Fargo, North Dakota, 58105-5677, USA

    L.D. Charlet

  2. Plant & Soil Science Department, Texas Tech University, Lubbock, Texas, 79409-2122, USA

    J.S. Armstrong

  3. Panhandle Research & Extension Center, University of Nebraska, Scottsbluff, Nebraska, 69361, USA

    G.L. Hein

Authors
  1. L.D. Charlet
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  2. J.S. Armstrong
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  3. G.L. Hein
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Charlet, L., Armstrong, J. & Hein, G. Sunflower stem weevil and its larval parasitoids in the Central and Northern Plains of the USA. BioControl 47, 513–523 (2002). https://doi.org/10.1023/A:1016567930895

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