Revista Brasileira De Herbicidas 2015; 14(3): 228-234
Flumioxazin and S-metolachlor efficiency and selectivity in preemergence application of cassava ‘Baianinha’
This study has aimed to evaluate selectivity and efficiency in weed control of flumioxazin and S-metolachlor in ‘Baianinha’ cassava crops. The experimental design was randomized blocks with four replications. Treatments consisted in doses of flumioxazin of 50, 75, 100 and 125 g ha-1 a.i. and doses of S-metolachlor of 960, 1920, 2880 and 3840 g ha-1 a.i., besides weeded and unweeded controls. Treatments application was carried on 10/11/2013, 13 days after planting (DAP) and cassava cuttings presented underground sprouts measuring 3.0 to 4.5 cm. Flumioxazin at the highest dose provided 61.5% reduction of weeds biomass while S-metolachlor at the highest dose reduced 63.7% in the weeds biomass. Both herbicides have not promoted phytointoxication and have not altered roots yield and starch content of cassava plants. In conclusion, the herbicides were selective for ‘Baianinha’ cassava and efficient in weed control. However, control level increased with increments of doses assessed.
Keywords: herbicides; Manihot esculenta; weeds; seletividade
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