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Efficacy of Herbicide Seed Treatments for Controlling Striga Infestation of Sorghum
Author(s) -
Tuinstra Mitchell R.,
Soumana Souley,
AlKhatib Kassim,
Kapran Issoufou,
Toure Aboubacar,
Ast Aad,
Bastiaans Lammert,
Ochanda Newton W.,
Salami Issoufou,
Kayentao Mountaga,
Dembele Siaka
Publication year - 2009
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2008.06.0357
Subject(s) - striga , sorghum , biology , agronomy , infestation , sowing , imazapyr , seed treatment , weed control , germination
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.