Efficacy of glyphosate applied using an electrostatic sprayer as affected by adjuvant and carrier volumes

Campos, Saulo Felipe Brockes; Cunha, João Paulo Arantes Rodrigues da; Assunção, Heli Heros Teodoro de; Alves, Thales Cassemiro; Zandonadi, César Henrique Souza; Lemes, Ernane Miranda

doi:10.1590/s0100-83582020380100092

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…Researchers [ 48 , 49 ] have shown that the herbicide glyphosate added to water spray has the ability to reduce the surface tension of fluid, and Xue et al [ 50 ] reported that decreasing the surface tension of the spray solution can inhibit its shape retention capacity and promote its rupture, modifying the droplet spectrum and leading to a more uniform size distribution. This may have occurred in the present study, where the application at a rate of 10 L ha −1 yielded a higher concentration of herbicide and greater homogeneity than the spray solution of 100 L ha −1 .…”

Section: Resultsmentioning

confidence: 99%

Control of Urochloa decumbens Using Glyphosate Applied by Remotely Piloted Aircraft and Ground Sprayer with Different Spray Nozzles

Lopes,

Cunha,

Nomelini

et al. 2024

Plants

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The use of remotely piloted aircraft (RPA) to spray pesticides currently occurs, but knowledge about this technology is lacking due to the different locations, targets, and products applied. The objective of this study was to evaluate the control of Urochloa decumbens with glyphosate applied using an RPA (10 L ha−1) equipped with different spray nozzles (XR 11001 and AirMix 11001). For the purpose of comparison, ground application was also performed (100 L ha−1). The deposition was evaluated by means of the quantification of a tracer by spectrophotometry, the droplet spectrum was evaluated with water-sensitive paper, and the control efficiency was evaluated based on visual measurements with percentage scores. Statistical process control was used to analyse the quality of the deposition in the area. The results showed that the application via RPA presented a greater amount of tracer on the leaves than the ground application, suggesting that the former is a good option for application, even providing a lower coverage and number of droplets per area. Both application methods were effective at controlling Urochloa decumbens. The nozzles showed potential for use in applications, with control efficiency higher than 84% from 21 days after application. The percentage of droplets smaller than 100 μm in the applications was less than 5%. No nonrandom behaviour was observed during deposition, indicating a high-quality process.

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Section: Resultsmentioning

confidence: 99%

Control of Urochloa decumbens Using Glyphosate Applied by Remotely Piloted Aircraft and Ground Sprayer with Different Spray Nozzles

Lopes,

Cunha,

Nomelini

et al. 2024

Plants

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“…Besides not reducing the control of E. plana clumps, such low application volume can improve operational efficiency since less water is needed to treat a given area. Study conducted with conventional spraying in different weed species showed that the decrease in the application volume from 150 to 90 or 50 L ha -1 caused no significant difference in the coverage of weeds applied with ammonium salt glyphosate, indicating that reducing the application volume is technically viable for this herbicide use (Campos et al, 2020).…”

Section: Effect Of Application Volumesmentioning

confidence: 98%

Use of a wiper applicator for the control of the invasive species Eragrostis plana with glyphosate salts

Merotto¹,

Gallon²,

Turra³

et al. 2022

Advances in Weed Science

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Background: Eragrostis plana is an invasive plant in native grassland areas associated with degradation of the Pampa biome. Selective control of E. plana is difficult due to its similarity to other grassland species. There is a lack of information about E. plana control using selective herbicide application equipment. Objective: The present study aimed to evaluate the efficacy of a pressurize rope wick applicator for controlling the invasive plant E. plana as function of different salts of glyphosate, application volumes, and year seasons. Methods: The studies were carried out under field conditions and repeated. The first study evaluated glyphosate salts of isopropylamine, dimethylamine, monoammonium, diammonium, and potassium at doses of 720 and 1440 g ha -1 and clethodim at 60 and 120 g ha -1 . The second study assessed application volumes of 8, 24, 40, and 56 L ha -1 using isopropylamine and potassium salts of glyphosate. Results: Glyphosate applied in summer was more effective at controlling E. plana, with less regrowth than glyphosate application in winter. The glyphosate diammonium was more effective at controlling E. plana than isopropylamine, dimethylamine, monoammonium, or potassium salt formulations at 1440 g ha -1 . Application volume of glyphosate between 8 and 40 L ha -1 provided similar control of E. plana and pasture selectivity. Conclusions: Glyphosate applied with a rope wick selective applicator was effective in controlling E. plana clumps and was selective to grassland. The control efficacy varied as a function of glyphosate salts and year season, but not due to application volume of 8 and 40 L ha -1 .

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Reduction of pesticide dosage and off‐target drift with enhanced control efficacy in unmanned aerial vehicle‐based application using lecithin adjuvants

Baek,

Eun,

Kim

et al. 2024

Pest Management Science

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BACKGROUNDUnmanned aerial vehicles (UAVs) are increasingly used in precision agriculture, particularly for pesticide application in rice cultivation. One challenge is off‐target pesticide drift, which raises environmental concerns and reduces pesticide efficiency. Lecithin adjuvants have been suggested to enhance droplet stability, reduce drift, and improve control efficacy. This study aims to evaluate the efficiency of lecithin adjuvants in reducing pesticide drift and improving deposition during UAV‐based pesticide application under various paddy field conditions.RESULTSThe addition of 1% lecithin adjuvants in 75% dosage of tricyclazole and ferimzone dual active ingredient formulations reduced off‐target drift by 2.62 to 3.16 times compared to the 100% and 75% dosage of standard formulations, with deposition efficiency along the spray path increasing by up to 155%. Wind direction and speed were found to be the primary environmental factor affecting deposition efficiency and drift rate. The control efficacy against leaf blast disease was significantly improved, with a maximum efficacy of 73.7% observed in the adjuvant‐treated group. Initial pesticide residues on rice plants were the highest in treatments with adjuvants, but their harvest products, brown rice and dried straw, were still within safe limits for human consumption.CONCLUSIONLecithin adjuvants significantly reduce off‐target drift and enhance pesticide deposition during UAV‐based application. This method allowed for lower pesticide dosages without compromising control efficacy, contributing to more sustainable agricultural practices. These findings highlight the potential of adjuvants to improve UAV pesticide application and reduce the environmental impact of pesticide use. © 2024 Society of Chemical Industry.

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Efficacy of glyphosate applied using an electrostatic sprayer as affected by adjuvant and carrier volumes

Cited by 6 publications

References 19 publications

Control of Urochloa decumbens Using Glyphosate Applied by Remotely Piloted Aircraft and Ground Sprayer with Different Spray Nozzles

Control of Urochloa decumbens Using Glyphosate Applied by Remotely Piloted Aircraft and Ground Sprayer with Different Spray Nozzles

Use of a wiper applicator for the control of the invasive species Eragrostis plana with glyphosate salts

Reduction of pesticide dosage and off‐target drift with enhanced control efficacy in unmanned aerial vehicle‐based application using lecithin adjuvants

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