Field experiments were set up in three ecological zones of southwestern Nigeria to evaluate the effectiveness of Atoll ® (atrazine + isoxaflutole), a new herbicide mixture, for weed control in maize. Crop injury rating indicated pronounced phytotoxic effect on crops from 1.34 to 1.61 kg a.i. ha -1 Atoll in all locations. Acceptable weed control was realized in Atoll treatments except for 0.54 kg a.i. ha -1 at Ilorin and Orin-Ekiti. Atoll treatments in Ilorin and Orin-Ekiti controlled weeds more

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... effectively than atrazine soluble concentrate (SC) and atrazine wettable powder (WP). Average yield across the locations was highest in 0.81 kg a.i. ha -1 Atoll. Yield losses in weedy checks compared to 0.81 kg a.i. ha -1 Atoll ranged between 18.8 and 67.3 per cent in the three locations. Original scientific paper.