MACHI, ANDRE R.FERRARI, LUIZ S.ARTHUR, VALTER2019-07-242019-07-242018MACHI, ANDRE R.; FERRARI, LUIZ S.; ARTHUR, VALTER. Efficacy of irradiated glyphosate against Brachiaria plantaginea L.. <b>Journal of Agricultural Science</b>, v. 10, n. 7, p. 383-389, 2018. DOI: <a href="https://dx.doi.org/10.5539/jas.v10n7p383">10.5539/jas.v10n7p383</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/29939.1916-9752http://repositorio.ipen.br/handle/123456789/29939Glyphosate irradiated with cobalt-60 type Gammacell 220 at different rates was sprayed on seedlings of Brachiaria plantaginea L., a common weed, grown in pots (one seedling with 3-4 leaves in each pot), at different concentrations equivalent to 1 L h-1 or 3 L h-1. Each sample containing 40 ml of the product (glyphosate) taken to a source of Cobalt-60 type Gammacell 220, under a dose rate of 0.312 kGy/hour in doses of: T0, control (water instead of glyphosate); T1, glyphosate at 1.0 L h-1; T2, glyphosate at 3.0 L h-1; T3, glyphosate irradiated at 250 Gy at 1.0 L h-1; T4, glyphosate irradiated at 500 Gy at 1.0 L h-1; T5, glyphosate irradiated at 750 Gy at 1.0 L h-1; and T6, glyphosate irradiated at 1000 Gy at 1.0 L h-1. The effects were assessed in terms of the extent of injury, where scale of 0% (no visible injury) to 100% (plant dead), number of tillers, weed survival and dry biomass produced by the plants. The most effective treatment was glyphosate irradiated at 250 Gy h-1 and applied at 1.0 L h-1. It is important to know that gamma radiation in glyphosate herbicide can be used without antagonistic interactions without cause resistance.383-389openAccessirradiationherbicidesplantsgamma radiationbiomassdryingcobalt 60pest controlweedsArtigo de periódico71010.5539/jas.v10n7p383https://orcid.org/0000-0003-3521-9136Sem PercentilSem Percentil CiteScore