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- Grain sorghum ( Sorghum bicolor ) is one cereal crop that faces huge problems with weed interference mostly because the lack of selective herbicides. This study aimed to assess the efficacy and safety of herbicide alternatives for weed control in grain sorghum as well as the selectivity of atrazine + s-metolachlor to different hybrids. Three field trials were designed as a randomized complete block with four replications. All experiments were conducted in Jardinopolis-SP and Mogi Mirim-SP during the 2015/16 growing season. Two trials included acetochlor, flumioxazin, fluroxypyr, mesotrione and s-metolachlor, applied in pre or post-emergence, in association or not with atrazine. A third trial was carried out with rates of the premix containing atrazine + s-metolachlor applied to the following hybrids: 1G100, 1G220, 1G230, 1G244, 1G282, 50A10, 50A40, 50A50 and 50A70. The pre‑emergence herbicides that exhibited satisfactory efficacy of weed control and selectivity to sorghum crop were flumioxazin, atrazine + mesotrione and atrazine + s-metolachlor. For post‑emergence, atrazine, atrazine + acetochlor, atrazine + s-metolachlor and atrazine + fluroxypyr were the best treatments for both efficacy and selectivity. The application of atrazine + s-metolachlor at the evaluated rates was considered selective to the nine hybrids assessed. Keywords: acetochlor, fluroxypyr, mesotrione, herbicide tolerance, weed control. MANEJO QUIMICO DE PLANTAS DANINHAS EM SORGO GRANIFERO E SELETIVIDADE  DE ATRAZINE + S-METOLACHLOR PARA DIFERENTES HIBRIDOS RESUMO – O sorgo granifero ( Sorghum bicolor ) e um dos cereais de verao que mais enfrenta problemas com plantas daninhas em razao da interferencia destas especies e carencia de herbicidas para controla-las. O objetivo deste estudo foi avaliar a eficacia e seguranca de herbicidas alternativos no controle de plantas daninhas em sorgo granifero, assim como a seletividade de atrazine + s-metolachlor para diferentes hibridos. Tres experimentos foram realizados em campo com delineamento de blocos ao acaso e quatro repeticoes, sendo conduzidos em Jardinopolis-SP e/ou Mogi Mirim-SP, ao longo da safra 2015/16. Em dois experimentos, acetochlor, flumioxazin, fluroxypyr, mesotrione e s-metolachlor foram avaliados em pre e/ou pos-emergencia da cultura, em associacao ou nao (isolados) com atrazine. O terceiro experimento foi realizado com doses crescentes de atrazine + s-metolachlor e os hibridos de sorgo granifero 1G100, 1G220, 1G230, 1G244, 1G282, 50A10, 50A40, 50A50 e 50A70. Os tratamentos com controle satisfatorio de plantas daninhas e seletividade a cultura, em pre-emergencia, foram flumioxazin, atrazine + mesotrione e atrazine + s-metolachlor. Em pos-emergencia, eles foram atrazine, atrazine + acetochlor, atrazine + s-metolachlor e atrazine + fluroxipyr. A aplicacao de atrazine + s-metolachlor nas doses testadas foi seletiva para os nove hibridos avaliados. Palavras-chave: acetochlor, fluroxypyr, mesotrione, tolerância a herbicidas, controle de plantas daninhas. metolachlor at the evaluated rates was selective to the nine hybrids assessed.

CHEMICAL WEED MANAGEMENT IN GRAIN SORGHUM AND SELECTIVITY OF ATRAZINE + S-METOLACHLOR TO DIFFERENT HYBRIDS