Evaporation time of droplets containing thiamethoxam and adjuvants on hydrophilic, hydrophobic and lipophilic surfaces under different air relative humidities

Lasmar, Olinto; Cunha, João Paulo Arantes Rodrigues da

doi:10.14393/bj-v32n1a2016-29647

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…Droplet size could be adjusted by the different types of nozzle and spraying pressure [15] , which also could be adjusted by adding adjuvants to change the surface tension of liquid [16,17] , this also could improve the efficiency of pesticide [18] . Different types and concentrations of adjuvants may cause distinct effects on droplet evaporation, surfactant [19][20][21] .…”

Section: Introduction mentioning

confidence: 99%

Dynamic evaporation of droplet with adjuvants under different environment conditions

Wang

Lan

et al. 2020

International Journal of Agricultural and Biological Engineering

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Pesticide droplet is evaporating during the falling from the nozzle to the target. This dynamic evaporation is influenced by ambient temperature, relative humidity (RH), adjuvant type and concentration. In the evaporation process, the droplet size at different height is affected by the droplet evaporation. Based on this, this study determined the droplet dynamic evaporation by collecting the droplets from different height via silicone oil method with a certain temperature and RH. Eight adjuvants were chosen, including three organo-silicon, three vegetable oil and two non-ionic, with five concentrations. All droplets were generated by a droplet generator. The results showed that the type of adjuvant, ambient temperature and RH had no significant influence on droplet size generated by droplet generator. All the adjuvants in this experiment cannot reduce dynamic evaporation; Concentration of adjuvant made a difference in dynamic evaporation. This could be because of the property of adjuvant. Organo-silicon adjuvants have a negative correlation with water vapor pressure, it showed less dynamic evaporation at high temperature and RH. Vegetable oil and non-ionic adjuvant, they are the same as the controlled blank that the dynamic evaporation reduces with decreasing temperature and increasing RH.

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Section: Introduction mentioning

confidence: 99%

Dynamic evaporation of droplet with adjuvants under different environment conditions

Wang

Lan

et al. 2020

International Journal of Agricultural and Biological Engineering

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Evaluation of Residue Levels of Imidacloprid and Thiamethoxam After Foliar Application to the Citrus Varieties Lane Late, Valencia Late, Rohde Summer, and Nules

Martínez-Ferrer

Campos-Rivela

Hernando-Guil

et al. 2019

Journal of Economic Entomology

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Neonicotinoids are used to protect citrus trees against pests. Dissipation and persistence of neonicotinoids in pollen and nectar of citrus trees after foliar applications and their potential exposure to pollinators have not been well characterized. Field studies were conducted using three orange and one mandarin varieties to compare the imidacloprid and thiamethoxam residue levels and their decline in pollen and nectar after treatments in pre-bloom close to flowering period and their persistence 1 yr after treatment. The possible risk to honeybees was assessed. In nectar, thiamethoxam and imidacloprid residues were between 61 and 99% lower than in pollen, depending on the citrus variety or/and the days after treatment when applied close to blooming. At the end of the flowering period, imidacloprid in pollen and nectar was not detected in the mandarin variety after treatment in pre-bloom, whereas for thiamethoxam, no residues were detected in nectar but 10 ng/g was detected in pollen. There were no quantifiable levels of residues for either neonicotinoids in pollen or nectar during the flowering period of the following year. Neonicotinoid residue levels and their decline in nectar and pollen in citrus depended on the timing of applications relative to flowering and on the citrus variety. The absence of neonicotinoid residues 1 yr out after foliar applications in all varieties assayed demonstrated that none of the neonicotinoids tested were persistent. The results could be different in other citrus varieties, and therefore, also the exposure assessment for managed pollinators.

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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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show abstract

Evaporation time of droplets containing thiamethoxam and adjuvants on hydrophilic, hydrophobic and lipophilic surfaces under different air relative humidities

Cited by 4 publications

References 13 publications

Dynamic evaporation of droplet with adjuvants under different environment conditions

Dynamic evaporation of droplet with adjuvants under different environment conditions

Evaluation of Residue Levels of Imidacloprid and Thiamethoxam After Foliar Application to the Citrus Varieties Lane Late, Valencia Late, Rohde Summer, and Nules

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

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