Dynamics and weed control effectiveness of dicamba herbicide when applied directly on the soil and corn straw in Brazil

Mundt, Tamara Thaís; Carbonari, Caio Antônio; Moisinho, I. S.; Brito, Ivana Paula Ferraz Santos de; Picoli, Gilmar José; Ovejero, R. F. Lopez; Velini, Edivaldo Domingues

doi:10.1080/03601234.2022.2128613

Cited by 3 publications

(3 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although dicamba PRE activity did not result in giant ragweed control >70% in this study, the residual activity of dicamba appears to improve early season giant ragweed control in dry spring seasons. Mundt et al (2022) also observed that residual weed control is extended if the rainfall accumulation is not enough to leach dicamba molecules through the crop residue and soil profile.…”

Section: Resultsmentioning

confidence: 99%

Preemergence herbicide premixes reduce the risk of soil residual weed control failure in corn

et al. 2023

View full text Add to dashboard Cite

Widespread occurrence of herbicide-resistant weeds and more variable weather conditions across the US has made weed control in many crops more challenging. Preemergence (PRE) herbicides with soil residual activity have resurged as the foundation for early-season weed control in many crops. Field experiments were conducted at Janesville and Lancaster, WI in 2021 and 2022 (4 site-years) to evaluate the weed control efficacy of solo (single site of action [SOA]) and premix (two or more SOAs) PRE herbicides in conventional tillage corn. Treatments consisted of 18 PRE herbicides plus a non-treated check. At Janesville-2021, S-metolachlor + bicyclopyrone + mesotrione, atrazine + S-metolachlor + bicyclopyrone + mesotrione, and clopyralid + acetochlor + mesotrione provided >72% giant ragweed control. At Janesville-2022, none of the PRE herbicides evaluated provided >70% giant ragweed control due to the high giant ragweed density and the lack of timely rainfall. At Lancaster-2021, atrazine, dicamba, and flumetsulam + clopyralid provided <45% waterhemp control, but the remaining treatments provided >90% control. At Lancaster-2022, the efficacy of some PRE herbicides was reduced due to the high waterhemp density; however, most herbicides provided >75% control. At Lancaster-2021 and 2022, only dicamba and S-metolachlor did not provide >75% common lambsquarters control. PRE herbicides containing SOA group 15 provided >75% control of giant foxtail. Across weed species, PRE herbicides with two (78%) and three (81%) SOAs provided higher weed control than PRE herbicides with a single SOA (68%), indicating that at least two SOAs PRE result in better early-season weed control. The efficacy of the PRE herbicide treatments evaluated herein varied according to the soil seed bank weed community composition and environmental conditions (i.e., rainfall following application), but the premixes were a more reliable option to improve early-season weed control in conventional tillage corn.

show abstract

Section: Resultsmentioning

confidence: 99%

Preemergence herbicide premixes reduce the risk of soil residual weed control failure in corn

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Under field conditions, Mundt et al [ 10 ] evaluated the dynamics of dicamba in different application systems and it was observed that the higher potential for dicamba leaching was applied directly to the soil. For the application over the corn straw, the maximum concentration of dicamba in the soil was found after 10 mm of rain.…”

Section: Discussionmentioning

confidence: 99%

“…All these processes alter the persistence of these products in the environment and determine the amount that will effectively be available to control the weeds. Evaluating the effect of dicamba applied in pre-emergence of the species Bidens Bidens pilosa , Euphorbia hetrophylla, and Ipomoea nil , Mundt et al [ 10 ] observed that, in the systems that had the presence of straw, in the application and post add, and the application over the straw, approximately 60% of the weeds would be controlled if a concentration of dicamba in the soil is about 18 ng g soil −1 .…”

Section: Introductionmentioning

confidence: 99%

Dynamics of 2,4-D and Dicamba Applied to Corn Straw and Their Residual Action in Weeds

Gazola¹,

Costa²,

Carbonari³

et al. 2022

Plants

View full text Add to dashboard Cite

2,4-D and dicamba are used in the postemergence management of eudicotyledonous weeds in different crops, most of which are grown under no-tillage systems. Due to the application methods for these products, their dynamics in straw and their residual action in soil have rarely been explored. Thus, the objective of this study was to evaluate the dynamics of 2,4-D and dicamba that have been applied to corn straw and to verify their relationship with residual control action in weeds. In the dynamics experiments, the herbicides were applied to 5 t ha−1 of straw, and rainfall simulations were performed with variable amounts and at different periods after application to evaluate herbicide movement in the straw. In the residual action experiments, the species Digitaria insularis, Conyza spp., Bidens pilosa, Amaranthus hybridus, Euphorbia heterophylla, and Eleusine indica were sown in trays, and 2,4-D and dicamba were applied directly to the soil, to the soil with the subsequent addition of the straw, and to the straw; all of these applications were followed by a simulation of 10 mm of rain. The physical effect of the straw and the efficacy of the herbicides in terms of pre-emergence control of the weed species were evaluated. The leaching of 2,4-D and dicamba from the corn straw increased with a higher volume of rainfall, and the longer the drought period was, the lower the final amount of herbicide that leached. The presence of the corn straw on the soil exerted a physical control effect on Conyza spp.; significantly reduced the infestation of D. insularis, B. pilosa, A. hybridus, and E. indica; and broadened the control spectrum of 2,4-D and dicamba, assisting in its residual action and ensuring high levels of control of the evaluated weeds. In the absence of the straw, 2,4-D effectively controlled the pre-emergence of D. insularis, Conyza spp., and A. hybridus, and dicamba effectively controlled D. insularis, Conyza spp., B. pilosa, A. hybridus, E. heterophylla, and E. indica.

show abstract

Sorption, leaching, and degradation of dicamba in two Brazilian soils: A study into soil layers

Aguiar,

Silva,

Barcellos Júnior

et al. 2023

Crop Protection

View full text Add to dashboard Cite

Dynamics and weed control effectiveness of dicamba herbicide when applied directly on the soil and corn straw in Brazil

Cited by 3 publications

References 33 publications

Preemergence herbicide premixes reduce the risk of soil residual weed control failure in corn

Preemergence herbicide premixes reduce the risk of soil residual weed control failure in corn

Dynamics of 2,4-D and Dicamba Applied to Corn Straw and Their Residual Action in Weeds

Sorption, leaching, and degradation of dicamba in two Brazilian soils: A study into soil layers

Contact Info

Product

Resources

About