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  1. Vol. 49 No. 3, p. 923-929
     
    Received: June 23, 2008
    Published: May, 2009


    * Corresponding author(s): drmitch@purdue.edu
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doi:10.2135/cropsci2008.06.0357

Efficacy of Herbicide Seed Treatments for Controlling Striga Infestation of Sorghum

  1. Mitchell R. Tuinstra *a,
  2. Souley Soumanab,
  3. Kassim Al-Khatibb,
  4. Issoufou Kapranc,
  5. Aboubacar Toured,
  6. Aad van Aste,
  7. Lammert Bastiaanse,
  8. Newton W. Ochandab,
  9. Issoufou Salamic,
  10. Mountaga Kayentaod and
  11. Siaka Dembeled
  1. a Dep. of Agronomy, Purdue Univ., West Lafayette, IN, 49706
    b Dep. of Agronomy, Kansas State Univ., Manhattan, KS, 66506
    c INRAN, Niamey, Niger
    d IER, Bamako, Mali
    e Crop and Weed Ecology Group, Wageningen Univ., Wageningen, the Netherlands. Contribution no. 08-329-J from the Kansas Agricultural Experiment Station

Abstract

Witchweed (Striga spp.) infestations are the greatest obstacle to sorghum [Sorghum bicolor (L.) Moench] grain production in many areas in Africa. The objective of this study was to evaluate the efficacy of herbicide seed treatments for controlling Striga infestation of sorghum. Seeds of an acetolactate synthase (ALS) herbicide–tolerant sorghum hybrid were treated with two ALS-inhibiting herbicides. Treatments included three rates of imazapyr (IMI), three rates of metsulfuron-methyl (MET), and an untreated control group. In greenhouse trials, observations at 32, 46, and 60 d after planting showed that seeds treated with the highest herbicide rates had the fewest Striga attachments and the greatest delay in attachment. All plants in the untreated group died at or before sorghum flowering; however, herbicide seed treatments, particularly metsulfuron, reduced Striga emergence and significantly increased sorghum grain yield and dry matter production. Field studies comparing seed treatments produced similar results with delayed Striga emergence and fewer emerged Striga plants in herbicide-treated plots. These studies indicate that herbicide seed treatments may provide a highly effective tool for managing Striga in sorghum.

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