Evaluation of Lumax® for preemergence weed control in maize in Nigeria

Author： Chikoye David Lum A. Fontem Ekeleme Friday Udensi Udensi

ISSN： 1366-5863

Source： International Journal of Pest Management, Vol.55, Iss.4, 2009-09, pp. : 275-283

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Abstract

The efficacy of various herbicides against weeds of maize was studied in field trials at Ibadan, Nigeria in 2003 and 2004. The formulations were atrazine (Gesaprim® 90 WDG at 3.5 kg a.i. ha-1 and Rhonazine® 80 WP at 3.0 kg a.i. ha-1), a mixture of atrazine and metolachlor (Primextra® Gold™ 660 SC at 4.0 kg a.i. ha-1 and Primextra® 500 FW at 2.5 kg a.i. ha-1), and a mixture of mesotrione, S-metolachlor and atrazine (Lumax® at five rates: 1.88-2.96 kg a.i. ha-1). Unweeded and hoe-weeded treatments were controls. Lumax® at all rates, Rhonazine® at 3.0 kg a.i. ha-1, and Primextra® at 2.5 kg a.i. ha-1 controlled sedges, Commelina benghalensis, and Pueraria phaseoloides as effectively as the weeded control (95-100%). Weed density and biomass were significantly reduced and maize yield increased by 12-22%. The highest yield was in treatments with 2.15 - 2.96 kg a.i. ha-1 of Lumax® and 3.5 kg a.i. ha-1 of Gesaprim®, and the weeded control. Lumax® is more effective for weed control at lower rates than the previously used formulations.