Adjuvant interference on spray solution properties of 2,4-D and dicamba herbicides and their efficacy for Ipomoea SPP. control

Authors

  • Roberto Costa Avila Neto Universidade Federal de Santa Maria
  • Adriano Arrué Melo Universidade Federal de Santa Maria
  • André da Rosa Ulguim Universidade Federal de Santa Maria
  • Rafael Munhoz Pedroso Universidade do Estado de São Paulo
  • Geovana Facco Barbieri Universidade Federal de Pelotas
  • Cassiano Salin Pigatto Universidade Federal de Pelotas
  • Eric Fernandes Luchese Universidade Federal de Santa Maria

DOI:

https://doi.org/10.14393/BJ-v36n0a2020-53578

Keywords:

Auxin, Morningglories, pH, Surface Tension.

Abstract

Synthetic auxin herbicides constitute major alternatives for managing tough-to-kill weeds such as Ipomoea spp. Adjuvant use is known to positively affect the biological efficacy of pesticides by modifying key spraying solution and droplet properties. Determining to what extent the use of adjuvants could change spray solution parameters and affect synthetic auxin herbicides’ efficiency for Ipomoea spp. control were the research goals. The study was conducted in two phases: laboratory and field, respectively. In the laboratory, the pH, the surface tension, and the resources of the herbicide drops were measured. In the field, weed control was evaluated. All adjuvants modified spray solution properties, lowering surface tension values. Most adjuvants decreased pH values as well as number and density of droplets due to an increase in droplet size. Regardless of adjuvant usage, Ipomoea spp. control levels rose more rapidly following 2,4-D spraying rather than dicamba, resulting in lower biomass accumulation when the former was used. Dicamba-containing treatments displayed slightly but significantly lower Ipomoea spp. control levels at the end of the evaluation period. Herbicide efficacy for Ipomoea spp. control was not improved upon the addition to the spray solution of any of the tested adjuvants. Adjuvant use altered spraying solution and droplet properties. 2,4-D spraying allowed for lower Ipomoea spp. biomass and greater control levels relative to dicamba, suggesting it might constitute a better option for Ipomoea spp. control. Even though herbicide efficacy was not improved with adjuvants, their use should still be considered given favorable spraying solution alterations, mainly with some alteration in droplet sizes despite the use of similar spray nozzles tips - maintaining weed control efficacy.

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Author Biographies

Roberto Costa Avila Neto, Universidade Federal de Santa Maria

 

 

Adriano Arrué Melo, Universidade Federal de Santa Maria

 

 

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Published

2020-12-30

How to Cite

AVILA NETO, R.C.., MELO, A.A.., ULGUIM, A. da R.., PEDROSO, R.M.., BARBIERI, G.F.., PIGATTO, C.S.. and LUCHESE, E.F.., 2020. Adjuvant interference on spray solution properties of 2,4-D and dicamba herbicides and their efficacy for Ipomoea SPP. control. Bioscience Journal [online], vol. 36, pp. 238–248. [Accessed23 May 2022]. DOI 10.14393/BJ-v36n0a2020-53578. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/53578.

Issue

Section

Agronomy