Effect of humectants on the uptake and efficacy of glufosinate in wild oat (Avena fatua) plants and isolated cuticles under dry conditions

Ramsey, Ryan; Stephenson, Gerald R.; Hall, J. Christopher

doi:10.1614/ws-05-051r.1

Cited by 24 publications

(23 citation statements)

References 35 publications

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“…In contrast to temperature, relative humidity did not influence weed response to herbicide stress. Similar results were reported by F a u s e y and R e n n e r [17], but generally this finding is inconsistent with most of the previous papers that have proven a weaker response of weeds to herbicides at low relative humidity [4,18,19]. The lack of differences in weed response proved in this research may be due to the small differences between the relative humidity levels tested.…”

Section: Discussioncontrasting

confidence: 62%

Amino acid content and biomass productivity of selected weed species as an indicator of their response to herbicide stress

2013

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A b s t r a c t Biomass reduction and amino acid content in plants of). The fresh weight of weeds and the content of free branched-chain amino acids (valine, leucine and isoleucine) in plant tissue were recorded. Tribenuron methyl was the herbicide that most limited biomass productivity, regardless of weed species and climate conditions. S. media was more sensitive to herbicides than P. rhoeas. Weed response to herbicides was dependent on temperature, but not on relative humidity. Tribenuron methyl applied to both weed species under various temperature regimes caused significant amino acid deficiency. The reduction in amino acid content in plants of P. rhoeas was greater at warm temperature compared to the cold regime due to stronger reaction to tribenuron methyl applied under these conditions. In most of cases, the mixture of 2.4-D + dicamba induced overproduction of amino acids.

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Section: Discussioncontrasting

confidence: 62%

Amino acid content and biomass productivity of selected weed species as an indicator of their response to herbicide stress

2013

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“…After evaporation, crystals containing the active ingredient can be formed, preventing its absorption (Yu et al 2009b, Xu et al 2011. By increasing the evaporation time, the pesticide efficacy can be improved (Ramsey et al 2006). Nevertheless, the product runoff needs to be evaluated (Yu et al 2009a), mainly when higher carrier volumes are used.…”

Section: Resultsmentioning

confidence: 99%

“…In the majority of cases, applications should be avoided when the relative air humidity is lower than 50 % and temperature is higher than 30 ºC. Ramsey et al (2006) observed that the relative air humidity has a great effect on foliar pesticide applications, mainly on the cuticle of the plant and also on the evaporation and deposition of droplets. Zhu et al (2008) evaluated the evaporation time of droplets deposited on non-lipophilic surfaces under different relative air humidity conditions, evidencing that a reduction of 30 % in relative air humidity caused an average reduction of 34 % in the evaporation time of droplets.…”

Section: Key-wordsmentioning

confidence: 99%

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

Cunha

Lasmar

Ramos

et al. 2016

Pesqui. Agropecu. Trop.

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The spread and evaporation time of droplets deposited on the target affect the application efficiency of pesticides. This study aimed at evaluating the evaporation time of droplets with different sizes, under different levels of relative air humidity, containing thiamethoxam and adjuvants sprayed on sugarcane leaves. Data were collected in a climate chamber with controlled conditions, where a digital microscope was set up to record the droplet images. The evaporation time was evaluated considering three relative air humidity rates (45 %, 60 % and 75 %). For each condition, a completely randomized experiment was installed with five replications, in a 5 x 6 factorial design consisting of five sprays (water, thiamethoxam, thiamethoxam + mineral oil, thiamethoxam + vegetable oil and thiamethoxam + spreader) and six droplet diameters (337 µm, 424 µm, 486 µm, 576 µm, 831 µm and 985 µm). The evaporation time is directly and linearly related to the droplet diameter, with larger diameters requiring a longer time to evaporate. The evaporation time of droplets is also influenced by relative air humidity and spray composition. Among the adjuvants tested, the mineral oil provides the lower evaporation time for all droplet sizes.

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“…De acordo com Ramsey et al (2006) a umidade do ar tem grande efeito na aplicação de agrotóxicos foliares, principalmente sobre a cutícula da planta e também sobre a evaporação e deposição das gotas. Além das condições ambientais, o uso de adjuvantes também pode influenciar a evaporação de gotas depositadas.…”

Section: Introductionunclassified

Evaporação De Gotas De Caldas Contendo Fungicida E Adjuvantes Depositadas Em Superfície

Vilela

Antuniassi

2013

EnergAgric

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RESUMO:Este trabalho teve como objetivo avaliar a evaporação de gotas depositadas em superfície, em diferentes condições de umidade relativa, além de características referentes à deposição da gota e a tensão superficial das caldas. Os tratamentos foram compostos por um fungicida isolado e misturado com óleo mineral (Nimbus), óleo vegetal (Óleo Vegetal Nortox) e um organosilicone (Silwet L-77 AG). As avaliações foram realizadas com auxilio de um sistema de captura de imagens, em uma sala fechada, para facilitar o controle das condições de temperatura, mantida entre 23 e 24°C. Foram realizadas 12 observações entre as UR de 40 a 80% e três repetições para UR de 45 ± 1%, comparadas por Intervalo de Confiança para Diferenças entre as Médias, a 5% de probabilidade (IC95%) e as correlações entre as variáveis pelo Coeficiente de Pearson, a 5% de probabilidade. A evaporação de gotas foi afetada pela umidade relativa do ar e pelo uso de adjuvantes, sendo o óleo mineral o adjuvante que proporcionou a calda menos sensível às variações de umidade. A área média molhada correlacionou-se de forma negativa com o tempo de evaporação de gotas e com a tensão superficial. O organosilicone foi o adjuvante que promoveu maior mudança na evaporação e deposição das gotas em superfície, em relação às caldas avaliadas. KEYWORDS: tecnologia de aplicação, deriva, diâmetro mediano volumétrico (DMV). DROPLET EVAPORATION OF SPRAY SOLUTIONS WITH FUNGICIDES AND ADJUVANTS ON A SURFACEABSTRACT: This research evaluated the droplet evaporation on a surface under different relative humidity conditions, and analyzed the characteristics related to droplet deposition and the surface tension of spray solutions. The treatments were composed by a fungicide isolated and mixed with adjuvants. The droplet evaporation evaluation was done with a system to capture images in a ambient controlled room to facility control of temperature, which was kept between 23 and 24°C. There were performed 12 observations between 40 and 80% of relative humidity. Three repetitions at 45% relative humidity were compared using Confidence Interval at 95% probability and the correlations between variable were analyzed using Pearson at 5% probability. The droplet evaporation was affected by relative humidity and by adjuvants use, and the mineral oil was the adjuvant less sensible to humidity variations. The wetted medium area was negatively correlated to evaporation. The deposition characteristics were not affected by changes in relative humidity, only by adjuvants. The organsilicone was the adjuvant that promoted the biggest change in evaporation and deposition of the dropletson a surface, compared to the other treatments.

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Effect of humectants on the uptake and efficacy of glufosinate in wild oat (Avena fatua) plants and isolated cuticles under dry conditions

Cited by 24 publications

References 35 publications

Amino acid content and biomass productivity of selected weed species as an indicator of their response to herbicide stress

Amino acid content and biomass productivity of selected weed species as an indicator of their response to herbicide stress

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

Evaporação De Gotas De Caldas Contendo Fungicida E Adjuvantes Depositadas Em Superfície

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