Control of conyza bonariensis with glyphosate associated to adjuvants applied with different spray nozzles


  • Tiago Lima do Espírito Santo Estadual de Mato Grosso do Sul
  • Cristiane Gonçalves de Mendonça Estadual de Mato Grosso do Sul
  • Felipe André Sganzerla Graichen Universidade Estadual de “Júlio de Mesquita Filho”
  • Carlos Gilberto Raetano Universidade Federal de Viçosa
  • Paulo Eduardo Teodoro Universidade Federal de Viçosa



Horseweed, Glyphosate, Resistance, Surfactante, Spray Systems.


The study aimed to evaluate the control of C. bonariensis in delayed post-emergence stage using different spray nozzles and solutions with and without adjuvants; and to verify the occurrence of resistance to glyphosate, determining the dose-response curve. The experimental design was randomized in factorial (6 spray nozzles x 5 spray solution) in twenty repetitions. The treatments were represented by spray nozzles: XR 110015 XR 11002, TT 11002 AIXR 11002, AIC 11002 and AI 11002. Tested spray solution were: glyphosate; glyphosate + Nimbus®; glyphosate + Agral®; Glyphosate + LI-700® and without herbicide application. The use or not of adjuvants in the spray solution did not differ statistically from the solution containing the herbicide only. The spray nozzles AIXR 11002, TT 11002 and XR 11002 presented best results of control the horseweed from the evaluation of 07 days after application (DAP) and 28 DAP and such spray nozzles maintained the best average of control percentage. The higher dry matter reductions of horseweed were obtained by spray nozzles 110015 XR, TT 11002 and 11002 XR compared with the control. The population evaluated presents biotypes that resist to doses of 2.880 g.ha-1 a.e. of glyphosate. It is concluded that the evaluated biotypes presents tolerance to glyphosate, independent of your association or not with adjuvants.


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How to Cite

SANTO, T.L. do E., MENDONÇA, C.G. de, GRAICHEN, F.A.S., RAETANO, C.G. and TEODORO, P.E., 2017. Control of conyza bonariensis with glyphosate associated to adjuvants applied with different spray nozzles . Bioscience Journal [online], vol. 33, no. 2, pp. 297–305. [Accessed25 February 2024]. DOI 10.14393/BJ-v33n2-33818. Available from:



Agricultural Sciences