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Imazapyr seed dressings for Striga control on acetolactate synthase target-site resistant maize |
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| Authors: | Fred K Kanampiu Joel K Ransom Jonathan Gressel |
| Institution: | a CIMMYT, P.O. Box 25171, Nairobi, Kenya b Department of Plant Sciences, Weizmann Institute of Science, Rehovot 76100, Israel |
| Abstract: | High herbicide levels can be localized on or near seed of acetolactate synthase (ALS) resistant maize (Zea mays). The magnesium salt of imazapyr was optimal for seed dressings (drenching, priming, and coating), for preventing field damage from parasitic Striga hermonthica (witchweed) in three seasons. Striga emerged on untreated maize from 6 to 12 weeks after planting. There was almost no Striga emergence for 3 months on imazapyr-dressed homozygous ALS-R 3245IR maize seeds. Occasional Striga that emerged and flowered formed no seed by harvest. Dust or polyvinylpyrrolidone adhesive coatings were safer in maize and as effective in Striga control as priming. Seed dressing coupled with pulling Striga escapes reduces infestation and can be used to deplete the Striga seed bank until genetic crop resistance becomes available. |
| Keywords: | Maize Striga Herbicide seed dressings Imazapyr Acetolactate synthase resistance |
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