Selectivity of Imazapic + Imazapyr Herbicides on Irrigated Rice as Affected by Seed Treatment with Dietholate and Clomazone Applied in Preemergence

Piveta, Leonard B.; Pinto, J.J.O.; Avila, Luis Antônio de; Noldin, José Alberto; Santos, L.

doi:10.1590/s0100-83582018360100062

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…It should be noted that the main injury symptoms observed in Tifton 419 and Zoysia grasses are characterized by a change in the green-yellow color of the lawn to purple. In general, formulations of the imidazolines chemical group's herbicides can initially cause chlorosis in young leaves, and the symptoms can advance to an intense purple with subsequent evolution to necrosis of these leaves (Shaner, 2014;Piveta et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Development of lawns in response to applications of imazapic alone or combined with imazapyr

Marques

Marchi

Martins

2021

Rev. bras. eng. agríc. ambient.

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Successive mowings are the major maintenance cost of lawns. These costs have led to the search for alternatives to mechanical management. This study aimed to determine the effects of imazapic herbicide doses applied alone or combined with imazapyr as a growth regulator of Tifton 419 and Zoysia grasses. The experimental design was randomized blocks with four replicates, and the treatments consisted of four doses of herbicide imazapic applied alone (35; 70; 105 and 140 g a.i. ha-1) and three doses of imazapic + imazapyr mixture (7.875 + 2.625; 15.57 + 5.25 and 23.625 + 7.875 g a.i. ha-1) in two sequential applications on both grass lawns. Visible injury symptoms, canopy height, height and number of inflorescences, and total dry matter of clippings were determined. Applications of imazapic alone or combined with imazapyr effectively reduced all morphological variables of Tifton 419 grass. Imazapic applied alone or mixed with imazapyr provided adequate control of growth and quantity of dry matter of Zoysia grass clippings. Still, with some application doses of this herbicide, the number of inflorescences present in the lawns increased.

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Section: Resultsmentioning

confidence: 99%

Development of lawns in response to applications of imazapic alone or combined with imazapyr

Marques

Marchi

Martins

2021

Rev. bras. eng. agríc. ambient.

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“…It should be emphasized that the main injury symptoms found in Bahiagrass and St. Augustine grasses consisted of changes in the color of the lawn from green-yellowish to purple. In general, imidazolinonebased herbicide formulations may initially cause chlorosis of young leaves, and the symptoms may progress to an intense purple color of the leaf with subsequent evolution to necrosis of these leaves (Shaner 2014;Piveta et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Use of the imazapic herbicide applied alone or tank mix with imazapyr as growth regulator of lawns

2021

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Successive mowing are the major maintenance costs of lawns. Thus, both the expenditure with mowing and the visual and physiological aspect of the lawn have led to the search for alternatives to mechanical management. Thus, this work aimed to study the effects of different rates of imazapic herbicide applied alone or combined with imazapyr as a growth regulator of Bahiagrass (Paspalum notatum) and St. Augustine grass (Stenotaphrum secundatum). The experimental design was a randomized block with four replicates, and the treatments consisted of six rates of imazapic herbicide (35; 70; 105; 140; 175 and 210 g a.i. ha-1) for both species, three rates of imazapic + imazapyr in tank mix (15.57 + 5.25; 23.625 + 7.875; 32.5 + 10.5 g a.i. ha-1) for Bahiagrass and four rates of imazapic + imazapyr mixture (7.875 + 2.625; 15.57 + 5.25; 23.625 + 7.875; 32.5 + 10.5 g a.i. ha-1) for St. Augustine grass. The effect of the treatments was evaluated by observing visible injury symptoms, canopy height, height and number of inflorescences and total dry matter of clippings. Applications of imazapic alone or combined with imazapyr were effective in reducing plant height, number and height of inflorescences and total amount of dry matter of clippings produced by Bahiagrass plants. Imazapic provided satisfactory control of St. Augustine growth, but its utilization caused an increase in the number of inflorescences present in the lawns.

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“…Clomazone which belongs to the isoxazolidinone family [11] has been used for the control of annual grasses and broadleaf weeds in cotton [12], teas, potatoes, rice [13], squash, cassava, soybeans [14,15], sweet tobacco [16], wheat [17] and a variety of other vegetable crops [18]. Clomazone which belongs to toxicological class II inhibits the chloroplastic isoprenoid pathway in higher plants [19].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Analysis and Dietary Exposure Risk Assessment of Fomesafen, Clomazone, Clethodim and Its Two Metabolites in Soybean Ecosystem

Pang

2020

IJERPH

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A commercial formulation, 37% dispersible oil suspension (DOS) (fomesafen, clomazone, and clethodim), is being registered in China to control annual or perennial weeds in soybean fields. In this paper, a liquid chromatography tandem mass spectrometry method with QuEChERS (quick, easy, cheap, effective, rugged, and safe) sample preparation was developed for the simultaneous determination of fomesafen, clomazone, clethodim, and its two metabolites (CSO and CSO2) in soybean, green soybean, and soybean straw samples. The mean recoveries of our developed method for the five analytes in three matrices were ranged from 71% to 116% with relative standard deviations (RSDs) less than 12.6%. The limits of quantification (LOQs) were 0.01 mg/kg in soybean, 0.01 mg/kg in green soybean, and 0.02 mg/kg in soybean straw while the limits of detection (LODs) ranged from 0.018 to 0.125 μg/kg for these five analytes. The highest final residual amount of CSO2 in green soybean samples (0.015 mg/kg) appeared in Anhui, and the highest in soybean straw samples was 0.029 mg/kg in Guangxi, whilst the terminal residues of fomesafen, clomazone, clethodim and CSO were lower than LOQs (0.01 mg/kg) in all samples. Furthermore, these terminal residues were all lower than the maximum residue limits (MRLs) set by China (0.1 mg/kg for fomesafen and clethodim, 0.05 mg/kg for clomazone) at harvest. Additional chronic dietary risk was evaluated using a risk quotients (RQs) method based on Chinese dietary habits. The chronic dietary exposure risk quotients were 4.3 for fomesafen, 0.12 for clomazone, and 19.3 for clethodim, respectively, which were significantly lower than 100. These results demonstrated that the dietary exposure risk of fomesafen, clomazone, and clethodim used in soybean according to good agricultural practices (GAP) was acceptable and would not pose an unacceptable health risk to Chinese consumers. These results not only offer insight with respect to the analytes, but also contribute to environmental protection and food safety.

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Selectivity of Imazapic + Imazapyr Herbicides on Irrigated Rice as Affected by Seed Treatment with Dietholate and Clomazone Applied in Preemergence

Cited by 7 publications

References 21 publications

Development of lawns in response to applications of imazapic alone or combined with imazapyr

Development of lawns in response to applications of imazapic alone or combined with imazapyr

Use of the imazapic herbicide applied alone or tank mix with imazapyr as growth regulator of lawns

Simultaneous Analysis and Dietary Exposure Risk Assessment of Fomesafen, Clomazone, Clethodim and Its Two Metabolites in Soybean Ecosystem

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