Tolerance of cassava to postemergence herbicides and determination of residues in the roots

Autores

  • Eliete de Fátima Ferreira da Rosa IFC Campus Santa Rosa do Sul
  • Mikael Cardoso dos Santos IFC Campus Santa Rosa do Sul
  • Marcos André Nohatto IFC Campus Santa Rosa do Sul
  • Leonardo Geremias Madeira IFC Campus Santa Rosa do Sul
  • Fagner Barboza Ramos IFC Campus Santa Rosa do Sul

DOI:

https://doi.org/10.15361/1984-5529.2020v48n3p220-225

Resumo

Assessing the tolerance of cassava to herbicides is essential for the development of weed management programs. Nevertheless, this assessment must include analyses of herbicide residues in the food so as to guarantee safety to the final consumer. Thus, this study evaluates the selectivity of cassava to different herbicides and quantifies pesticide residues in cassava roots (Manihot esculenta Crantz). The experimental design was randomized blocks with four replicates. The treatments were: control; mechanical weeding; bentazon (900 g a.i. ha-1); mesotrione (120 g a.i. ha-1); and imazethapyr (100 g a.i. ha-1), applied in postemergence. We used the herbicides clomazone (1080 g a.i. ha-1) and fluazifop (125 g a.i. ha-1) in pre-emergence and postemergence, respectively, in all treatments. Throughout the crop cycle, we assessed the following: cassava intoxication at 10, 20, and 30 days after the application (DAA) of postemergence herbicides; and plant height and stem diameter at 30 DAA. At the end of the crop cycle, we assessed the following: number of roots per plant; root length and diameter; root yield (kg/ha); starch content (%); and pesticide residues in cassava roots (multiresidue method). Despite its high phytotoxicity in the early development of cassava, mesotrione shows high selectivity and viability for weed control in this crop since, in general, it did not impair the other yield variables. Moreover, the study identified clomazone and sulfentrazone residues in cassava, indicating root contamination and high persistence of these herbicides in the environment.

 

 

Biografia do Autor

Eliete de Fátima Ferreira da Rosa, IFC Campus Santa Rosa do Sul

Eng. Agr. Doutora em Manejo do Solo (CAV-UDESC/SC). Atualmente Professora no IFC Campus Santa Rosa do Sul

Mikael Cardoso dos Santos, IFC Campus Santa Rosa do Sul

Acadêmico do curso de Engenharia Agronômica. Instituto Federal Catarinense – Campus Santa Rosa do Sul.

Marcos André Nohatto, IFC Campus Santa Rosa do Sul

Eng. Agr. Doutor em Fitossanidade UFPel. Atualmente é professor do Instituto Federal Catarinense Campus Santa Rosa do Sul.

Leonardo Geremias Madeira, IFC Campus Santa Rosa do Sul

Acadêmico do curso de Engenharia Agronômica. Instituto Federal Catarinense Campus Santa Rosa do Sul

Fagner Barboza Ramos, IFC Campus Santa Rosa do Sul

Acadêmico do curso de Engenharia Agronômica. Instituto Federal Catarinense Campus Santa Rosa do Sul

Publicado

08/09/2020

Edição

Seção

Fitotecnia - Crop Production