Espectros de gotas e idade de trifólios e sua interação com a área abaixo da curva de progresso da ferrugem da soja

Lenz, Giuvan; Balardin, Ricardo Silveiro; Minuzzi, Simone Gripa; Madalosso, Marcelo Gripa; Debortoli, M. P.; Gulart, Caroline; Ramos, Juliano Perlin de

doi:10.1590/s0103-84782012005000066

Cited by 3 publications

(2 citation statements)

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“…For the laboratory experiment, a cause and effect relationship was found, showing that the sooner rainfall occurs after an application, the lower the disease control, in this case, represented by the increase in the number of pustules per cm 2 (Figure 3). The influence of rain during the plant protection period is highly dependent on the time interval between the application of the products and its occurrence, besides the product being applied (13).…”

Section: Resultsmentioning

confidence: 99%

Leaf area, spray volumes and applicable quantities of fungicide during the protection period for control of Asian soybean rust

et al. 2018

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The purpose of this study was to check the influence of leaf area index, spray volumes and applicable quantities of fungicide during the protection period, and for control of Asian soybean rust. All tests were conducted in the field and in the laboratory between 2014 and 2016. The quantity of fungicide and the spray volume were varied in the application of fungicides on soybean plants with different leaf area index. Rainfall simulation tests were also carried out at different times after application of fungicide. The spray volume and application rate of fungicide should be adequately proportioned according to the leaf area index of the soybean cultivar. The closer to the time of application that the rain occurs, the lower the control obtained by applying the fungicide. The leaf area index, the fungicide application rates, and the spray volumes influenced the protection period of fungicides and the control of Asian soybean rust.

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Section: Resultsmentioning

confidence: 99%

Leaf area, spray volumes and applicable quantities of fungicide during the protection period for control of Asian soybean rust

et al. 2018

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“…A escolha da ponta é uma etapa fundamental para a eficácia dos tratamentos fitossanitários, Gulart et al (2013) observaram maior deposição da calda na cultura do trigo, quando utilizaram pontas que produziram maior tamanho de gotas, por sua vez Lenz et al (2012) constataram maior eficácia de controle e velocidade de absorção de fungicidas quando utilizaram gotas de menor tamanho.…”

Section: Introductionunclassified

Espectro Das Gotas Produzidas Por Pontas De Jato Plano Duplo Defasado Com Indução De Ar

Sasaki¹,

Teixeira²,

Maciel³

et al. 2016

Reveng

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Os fabricantes de pontas de pulverização constantemente disponibilizam novos modelos no mercado na tentativa de aumentar a eficiência das aplicações, entretanto muitas vezes seu comportamento é desconhecido em relação ao espectro das gotas produzidas. Sendo assim, este trabalho foi conduzido com o objetivo de avaliar o espectro de gotas proporcionado pelas pontas AI3070-015VP e AI3070-02VP. Estas apresentam dois jorros de pulverização defasados em relação à vertical (30 e 70°), ambos com indução de ar. Na análise do espectro, utilizou-se um analisador de partículas a laser (Spraytec, Malvern Instruments Co.) dotado de lente focal de 750 mm. Construiu-se um sistema para analisar individualmente os jorros produzidos pelas pontas. Realizaram-se as análises dos parâmetros técnicos da pulverização (DV0,1, DV0,5, DV0,9, Índice Span, %V < 100 μm e %V > 650 μm) empregando-se quatro pressões de trabalho (200, 300, 400 e 500 kPa). O experimento foi conduzido em delineamento inteiramente ao acaso, em esquema fatorial (2 x 2 x 4), sendo dois modelos de pontas hidráulicas dois leques e quatro pressões de trabalho. Para a ponta AI3070-015VP o jorro produzido com ângulo de 70° produziu gotas com maior diâmetro da mediana volumétrica (DMV) em relação ao de 30° ao passo que, para a ponta AI3070-02VP, o comportamento foi o inverso. As pontas testadas apresentaram gotas com baixo potencial de deriva, com %V

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Asian soybean rust control in response to rainfall simulation after fungicide application

et al. 2020

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Asian soybean rust (Phakopsora pachyrhizi) is the main disease that affects soybean in Brazil. Fungicide applications are the main control method, but they can be influenced by the occurrence of rain. We aimed to study the control of Asian soybean rust in response to the occurrence of simulated rainfall at different times after fungicide application. The penetrant fungicides trifloxystrobin + prothioconazole (60 + 70 g a.i. ha-1) and azoxystrobin + benzovindiflupyr (60 + 30 g a.i. ha-1) and the nonpenetrant fungicides mancozeb (1,500 g a.i. ha-1), chlorothalonil (1,440 g a.i. ha-1), and copper oxychloride (672 g a.i. ha-1) were tested using two spray volumes: 70 and 150 L ha-1. Rain was simulated from 30 to 240 minutes after fungicide application. Soybean leaflets were collected and inoculated with a spore suspension of P. pachyrhizi (5.0 x 104 mL-1) and incubated in plastic boxes for 20 days. The trials were repeated twice. Nonpenetrant fungicides were more susceptible to rain washing, mainly when the 70 L ha-1 spray volume was used. For the penetrative fungicides, the best control percentages were obtained when the rainfall occurred between 120 and 180 minutes after application, while the protective fungicides had the best control percentages when the rainfall occurred approximately 240 minutes after application. The Asian rust control is affected by the characteristics of the fungicide applied, by the time interval between fungicide application and rain occurrence and by the spray volume.

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Espectros de gotas e idade de trifólios e sua interação com a área abaixo da curva de progresso da ferrugem da soja

Abstract: Espectros de gotas e idade de trifólios e sua interação com a área abaixo da curva de progresso da ferrugem da soja Drops spectra and leaflets age and its interaction with the area under disease progress curve of soybean rust

Cited by 3 publications

References 5 publications

Leaf area, spray volumes and applicable quantities of fungicide during the protection period for control of Asian soybean rust

Leaf area, spray volumes and applicable quantities of fungicide during the protection period for control of Asian soybean rust

Espectro Das Gotas Produzidas Por Pontas De Jato Plano Duplo Defasado Com Indução De Ar

Asian soybean rust control in response to rainfall simulation after fungicide application

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