Dynamics of flowering and embryology of Striga hermonthica (Del.) Benth. (Scrophulariaceae): Implications for chemical control

Paré, J. R. Jocelyn; Dembele, Bandiougou; Ouedraogo, Oumar; Raynal-Roques, A.; Tuquet, C.; Sallé, G.

doi:10.1080/096708797228582

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“…The mechanism by which 2,4-DB reduces purple witchweed levels in sorghum is not clear, although it would be presumed to be similar to 2,4-D and other auxin-mimic herbicides that have been shown to be effective in purple witchweed control. Postemergence application of 2,4-D is effective in controlling purple witchweed reproduction (Paré et al 1997). Trials with 2,4-D postemergence to sorghum (30 DAP) but before emergence of purple witchweed have shown effectiveness at 1.5 and 2 kg ae/ha, although the higher rate causes malformation of the sorghum stems (Hoffmann et al 1997).…”

Section: Resultsmentioning

confidence: 99%

Herbicide Seed Treatments for Control of Purple Witchweed (Striga hermonthica) in Sorghum and Millet

2005

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A promising approach for the control of parasitic weeds is herbicide seed priming, which consists of soaking crop seeds in a herbicide solution such that the herbicide is later present in the crop seedling to inhibit growth of attaching parasites. This technique is effective where selectivity exists between crop and parasite; for example, varieties of imidazolinone-resistant maize. However, seed priming has not been reported for sorghum or pearl millet, two crops that are greatly affected by purple witchweed. Research was initiated to evaluate herbicides for potential use as seed priming agents in these crops. Auxin-mimic and acetolactate synthase-inhibitor class herbicides were evaluated; specifically, clopyralid, 2,4-DB, dicamba, picloram, and prosulfuron. For sorghum, immersion of seed in 0.5% (w/v) ae 2,4-DB for 5 min 1 d before planting reduced purple witchweed densities to levels 20 to 50% of nontreated controls. However, this concentration was at the threshold of crop toxicity and reduced sorghum yields in some experiments. None of the herbicides tested consistently reduced purple witchweed on pearl millet. This research illustrates both the potential and limitations of adapting seed priming technology for sorghum and pearl millet.

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Section: Resultsmentioning

confidence: 99%