Evaporation time of droplets containing thiamethoxam and adjuvants sprayed on sugarcane leaves

Cunha, João Paulo Arantes Rodrigues da; Lasmar, Olinto; Ramos, Arthur Magri Pereira; Alves, Guilherme Sousa

doi:10.1590/1983-40632016v4638499

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…The test results highlighted the importance of sprayer automation based on the psychrometric air conditions at application time. Coarse droplets are susceptible to psychrometric air conditions (Maciel et al, 2018) -although in smaller proportions -in comparison to fine droplets, fact that corroborates the study by Cunha et al (2016).…”

Section: Resultssupporting

confidence: 86%

“…According to Maciel et al (2017a), up to 27% of the applied liquid volume may be lost depending on the operational condition. Yu et al (2009), Xu et al (2010) and Cunha et al (2016), observed that the lower the relative air humidity, the higher the droplet evaporation rate, i.e., the evaporation time is associated with droplet diameter. In other words, the largest droplets require more time to evaporate.…”

Section: Introductionmentioning

confidence: 99%

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The automatic selection of hydraulic spray nozzles based on the psychrometric air conditions in hydropneumatic sprayers

et al. 2020

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

The automatic selection of hydraulic spray nozzles based on the psychrometric air conditions in hydropneumatic sprayers

et al. 2020

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“…It is a similar case in Argentina, where there is a presence of thiamethoxam in the C horizon soil (mineral layers that have been affected by pedogenetic processes in a minimal way) with high leaching capacity to groundwater [14]. In addition, the presence of thiamethoxam in water and soil ( Figure 6) reinforce the theory of chemical contaminants migration, where the highest concentrations of pesticides are present at lower depths of soil, mainly in shallow waters [3,21]. On the other hand in soils of loamy sandy texture, with guava plantations in Venezuela, good aeration, medium permeability and little retention of water and nutrients was observed, which allowed for thiamethoxam absorption isotherms with values of 2.95 ± 0.83 mg/kg.…”

Section: Discussionmentioning

confidence: 64%

Impact of Thiamethoxam in Papaya Cultivation (Carica papaya Linnaeus) in Rotation with Watermelon (Citrullus lanatus) Crops

et al. 2019

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Thiamethoxam is a neonicotinoid with systemic and contact action, used in Mexico for the care of different traditional fruit crops, mainly in the cultivation of papaya. Soils of agroecosystems with papaya in the Gulf of Mexico area, the main producers of this fruit, are currently characterized as 45% of the producers organize papaya cultivation in rotation with watermelon at different sowing dates. The objective of this study was to determine the presence and concentration of thiamethoxam in soil and water during the rotation of papaya crop with watermelon culture in the central zone of Veracruz, Mexico. An analysis was carried out to know the management of thiamethoxam in different types of soil and in the region; and in an experimental plot. Soil and water samples were taken at different stages during the rotation of both crops. Those samples were taken systemically, starting with the watermelon culture cycle and then, during the phenological stages in the papaya crop cycle. Soil and water samples were analyzed using HPLC-UV equipment for its determination. The design was random blocks with six repetitions and the software used for data analysis was the Statistica 2007 program. Thiamethoxam was concentrated in amounts of ≥0.40 mg/L in 79% of the samples in water and ≥0.55 mg/kg in 75% of the samples in soil. The highest values of thiamethoxam in soil were in the stage of watermelon culture with 0.4 mg/kg and in the soil preparation of the papaya crop with concentrations of 0.8 mg/kg. Whereas irrigation water from the watermelon cultivation and the soil preparation for the papaya showed concentrations of 0.5 and 0.7 mg/L, respectively. The presence of thiamethoxam was identified in 100% of the samples analyzed in the stage of preparation of soil and water of the cultivation area, concluding a possible risk of residuality of thiamethoxam in fruits that exceed the maximum limits of tolerance established by the EPA, EFSA and FAO.

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“…), 24 crabapple ( Malus sylvestris (L.) Mill. ), 25 and sugarcane ( Saccharum officinarum L.), 26 (ii) leaf surface micromorphology as evaluated on the leaves of spindle pelargon ( Pelargonium stenopetalum Ehrh.) and peppermint‐scented pelargon ( P. tomentosum Jacq.…”

Section: Introductionmentioning

confidence: 99%

Biological, surface, and wetting behavior of bio‐surfactants tank‐mixed with trifloxysulfuron‐sodium on Sorghum halepense

Aliverdi

2023

Pest Management Science

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BACKGROUND There is a public interest in developing bio‐surfactants due to their low toxicity and high biodegradation potential. However, their biological, surface, and behavior to use with agrochemicals has not been investigated. RESULTS Critical micelle concentrations (CMCs) for the synthetic surfactant dioctyl sodium sulfosuccinate (DOSS), the bio‐surfactant rhamnolipid (RL), and the bio‐surfactant surfactin (SF) were 1200, 50, and 50 mg L−1, respectively. Based on the ability of the surfactants to reduce the surface tension of trifloxysulfuron‐sodium spray solution at 0.25 to 1× CMC, they are ranked SF > RL > DOSS, while at 1.5 to 4× CMC, they are ranked SF = RL > DOSS. Without surfactant, trifloxysulfuron‐sodium at 10.04 g ha−1 reduced johnsongrass growth up to 50% (ED50). At best, SF at 1 to 4× CMC halved ED50. Unlike DOSS, which increased ED50 (12.89 g ha−1) due to a phytotoxic effect, SF and RL at 4× CMC decreased ED50 (5.19 and 6.50 g ha−1, respectively) without a phytotoxic effect. A 5‐μl droplet containing SF dried faster due to greater spread on the leaf surface than other surfactants. Although the wetted area of the leaf with the droplet containing RL was wider than that of DOSS, it took longer to dry. This observation contradicts the previous theory. CONCLUSION In terms of dosage, safety, and efficacy, the RL and SF were comparable to DOSS in other tank‐mix with trifloxysulfuron‐sodium. It seems that RL also works as a humectant, while SF likely works as a wax solubilisant. © 2023 Society of Chemical Industry.

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Evaporation time of droplets containing thiamethoxam and adjuvants sprayed on sugarcane leaves

Cited by 6 publications

References 8 publications

The automatic selection of hydraulic spray nozzles based on the psychrometric air conditions in hydropneumatic sprayers

The automatic selection of hydraulic spray nozzles based on the psychrometric air conditions in hydropneumatic sprayers

Impact of Thiamethoxam in Papaya Cultivation (Carica papaya Linnaeus) in Rotation with Watermelon (Citrullus lanatus) Crops

Biological, surface, and wetting behavior of bio‐surfactants tank‐mixed with trifloxysulfuron‐sodium on Sorghum halepense

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