Application time affects synthetic auxins herbicides in tank-mixture with paraquat on hairy fleabane control

Silva, Diecson Ruy Orsolin da; Aguiar, Adalin Cézar Moraes de; Basso, Cristiana; Muraro, Dionei Schmidt

doi:10.1590/0034-737x202168030005

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…Herbicides from the group of synthetic auxins are commonly used in the cultivation of cereals [38,39]. Their efficacy largely depends on the temperature [40,41]. In research, they are used primarily in the spring [42,43].…”

Section: Discussionmentioning

confidence: 99%

Autumn Application of Synthetic Auxin Herbicide for Weed Control in Cereals in Poland and Germany

et al. 2022

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The biological efficacy of herbicides MCPA+tribenuron-methyl (code name: MT-565 SG) and diflufenican+chlorotoluron (Legato Pro 425 SC) was estimated in eighteen field experiments on winter cereals in Poland and Germany to control broadleaf weeds. Postemergence application of tribenuron-methyl in combination with MCPA, applied at the 3-leaf stage to 3 tillers detectable in autumn in winter cereals, resulted in the majority of weed species occurring in autumn being effectively eliminated with MCPA+tribenuron-methyl applied at 1.0 kg∙ha–1. It also provided an acceptable (82.4–94.1%) and comparable level of control to commonly occurring weeds Brassica napus, Capsella bursa-pastoris, Centaurea cyanus, Lamium purpureum, Tripleurospermum inodorum, Stellaria media, and Thlaspi arvense. A satisfactory level of control of 66.3 to 88.3% was confirmed for Veronica persica, Viola arvensis, and Galium aparine. According to these results, the formulation of tribenuron-methyl combined with MCPA can be recommended for application in winter cereals in the autumn as an alternative to commonly available herbicides.

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Section: Discussionmentioning

confidence: 99%

Autumn Application of Synthetic Auxin Herbicide for Weed Control in Cereals in Poland and Germany

et al. 2022

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“…A previous study identified that the RN caused by 2,4-D in Sumatran fleabane was influenced by temperature, indicating the possible involvement of metabolic and/or transporter proteins (Leal et al 2022). There are only a few studies about the influence of temperature on the 2,4-D efficacy in plants of the genus Conyza even in susceptible biotypes (Montgomery et al 2017; Silva et al 2021). A study with horseweed identified higher control efficiency of 2,4-D at noon (11:00 to 13:30, 16 to 26 C) than in the early morning (6:00 to 6:30, 6 to 13 C) (Montgomery et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Rapid necrosis: Implications of environmental conditions and plant growth stage on 2,4-D resistance and effect of other auxinic herbicides in Sumatran fleabane (Conyza sumatrensis)

et al. 2023

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Resistant plants of Sumatran fleabane with an unusual rapid necrosis symptom after application of 2,4-D were characterized in previous studies. Field observations indicated variability in the occurrence of the rapid necrosis (RN) caused by 2,4-D, but the causes of the variation are unknown. This study aimed to investigate the effect of environmental conditions, plant growth stage, and simultaneous and sequential herbicide mixtures with other auxin mimics on the occurrence of RN caused by 2,4-D. Application at temperature of 12 C delayed the symptoms and decreased the intensity of the RN, but still resulted in plant survival to 2,4-D. The absence of light after herbicide application caused a slight delay in the symptoms, but the production of hydrogen peroxide and the size of necrosed area were not affected by the light treatments before and after 2,4-D application. Changes in plant photosynthesis through inhibiting photosystem II do not prevent the occurrence of the RN symptom. The auxinic herbicides dicamba, triclopyr, and halauxifen-methyl do not cause RN symptoms and are effective at controlling the resistant biotype when applied without 2,4-D, but the effectiveness of these herbicides was reduced when sprayed on the resistant biotype either together, 4 h or 24 h after 2,4-D. The RN phenotype does not occur for dicamba and triclopyr, even in advanced plant growth stages and high doses on the resistant biotype. The herbicides dicamba and triclopyr effectively controlled resistant plants, especially when sprayed at the initial growth stages. The results of this study identified environmental, plant development effects, and herbicide interactions, that interfere with the occurrence of RN symptoms caused by 2,4-D in Sumatran fleabane. These data provide insights about the mechanisms behind the RN symptoms caused by 2,4-D and are important for identifying the causes of variability of the herbicide symptomology and performance under experimental and field conditions.

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“…From then on, PQ began to be developed for commercial purposes, becoming available on the agricultural market in 1962. It is a non-selective, fast-acting contact herbicide used to control a broad spectrum of broadleaf weeds and grasses in sugarcane ( Aekrathok et al, 2021 ), soybean ( da Silva et al, 2021 ), cotton ( Ferreira et al, 2018 ), rice ( Lima et al, 2018 ), coffee ( de Queiroz et al, 2018 ) and in fruit such as grapes, apples, and pineapples. PQ is listed under a pesticide category in regulatory classifications ( e.g.…”

Section: Introductionmentioning

confidence: 99%

The effect of water molecules on paraquat salts: from physicochemical properties to environmental impact in the Brazilian Cerrado

Aguiar,

Costa,

Borges

et al. 2023

Front. Chem.

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Introduction: The green revolution model that is followed in the Brazilian Cerrado is dependent on mechanization, chemical fertilization for soil dressing and correction, and the use of herbicides. Paraquat is a methyl viologen herbicide marketed as bipyridylium dichloride salts and used (in low doses) to combat weeds in their post-emergence stage. It is a non-selective pesticide that causes the peroxidation of the lipids that make up the cell membrane, and when it comes into contact with foliage, it results in the death of the plant.Methods: The effect of water molecules co-crystallized in Paraquat salt structures was analyzed in anhydrous, dihydrate, and trihydrate forms to understand those physicochemical properties in its redox activity. The frontier molecular orbitals were also carried out using DFT to obtain the chemical reactivity of the bipyridylium cation. Finally, the supramolecular arrangements were evaluated to analyze the physicochemical stability and acquire insights on superoxide anions.Results and discussion: The electronic structure indicated that the BP cation presents an acidic character due to its low ELUMO value, while the salt has a more basic character due to its high EHOMO value. For this reason, the BP ion is more susceptible to reduction during the weeds’ photosynthesis process. During the process of plant photosynthesis, PQ is reduced to form a stable radical cation. In the supramolecular arrangement, the presence of water molecules increases the number of strong H-bonds, while the weak/moderate H-bonds are stabilized. PQ’s toxic effects are observed in wildlife, domesticated animals, human populations, and ecosystems. The influence of PQ on the terrestrial environment is limited because of the soil adsorption capacity associated with good agricultural practices. The current use of good agricultural practices in the Cerrado seems not to prevent the environmental impacts of herbicides like PQ because it aims for the expansion and profitability of large-scale farming based on input-intensive practices instead of sustainable agriculture processes.

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Application time affects synthetic auxins herbicides in tank-mixture with paraquat on hairy fleabane control

Cited by 4 publications

References 29 publications

Autumn Application of Synthetic Auxin Herbicide for Weed Control in Cereals in Poland and Germany

Autumn Application of Synthetic Auxin Herbicide for Weed Control in Cereals in Poland and Germany

Rapid necrosis: Implications of environmental conditions and plant growth stage on 2,4-D resistance and effect of other auxinic herbicides in Sumatran fleabane (Conyza sumatrensis)

The effect of water molecules on paraquat salts: from physicochemical properties to environmental impact in the Brazilian Cerrado

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