Efeito do número de aplicações de fungicidas no controle da ferrugem asiática da soja

Barros, Hélio Bandeira; Sediyama, Tuneo; Reis, Múcio Silva; Cecon, Paulo Roberto

doi:10.4025/actasciagron.v30i2.1741

Cited by 10 publications

(10 citation statements)

References 1 publication

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“…The yield with five applications in Ijaci was 770 kg ha -1 superior to Lavras. Similar results were observed by Finoto et al (2011) and Barros et al (2008), where the increase in number of applications provided increase in grain yield of 22 and 28%. Fungicides act positively on the physiology of plants by increasing chlorophyll levels and reducing ethylene production.…”

Section: Environmentssupporting

confidence: 86%

“…The crop cycle was influenced by the number of applications and the linear model was the one which that best fit, where the senescence of the crop delayed 12 days when compared to the control. Changes in the soybean cycle due to the growing number of fungicides applications has also been reported by Barros et al (2008), being observed up to 11 days longer in the cycle when compared to the treatment without fungicides. According to Bertelsen et al (2001) this value was expected because when the crop does not receive the preventive application of fungicides, the plant presents defense reactions which cause an energy cost and senescence acceleration.…”

Section: Effect Of the Number Of Pplicationsmentioning

confidence: 55%

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Effects and management of foliar fungicide application on physiological and agronomical traits of soybean

Zambiazzi¹,

Bruzi²,

Carvalho³

et al. 2018

Aust J Crop Sci

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Among the main factors limiting the yield of soybean, diseases stand out as the most important and difficult to control, causing up to 100% loss in the crop. The occurrence of diseases in soybean in Brazil is directly related to the tropical climate. Thus, the need to maintain high yield led to an increase in the number of foliar applications with fungicides. The aim of the study was to evaluate the response to the increase number of foliar fungicide applications on physiological and agronomic aspects and the economic viability of this management, contributing to the research of fungicide management in soybean. The experiment was performed in Minas Gerais state, in two environments (Ijaci and Lavras), during 2014/15 crop year, with the cultivar BRSMG 850GRR. The experiment was performed in a randomized block design, in split-plot, with three replications. The plots were composed of the number of applications (0, 1, 2, 3, 4 and 5). The applications started at the R 1 stage (beginning of bloom), with a 15-day interval to the next application (R 1 ; R 1 +15d; R 1 +30d; R 1 +45d; R 1 +60d). The sub plots were composed of different chemical fungicides (Elatus ® , Fox ® , Opera ® , Orkestra ® , and BAS-702-a not registered product). Chlorophyll content, dry mass, crop cycle, plant height, number of pods, number of grains, thousand-seed weight , grain yield, harvest index, daily increment and economic viability were evaluated. Individual and joint variance analyses were performed. The means were grouped by the Scott-Knott test and the regression analysis was applied to study the sources of quantitative variation. The phenotypic correlation between the number of applications and the physiological and agronomic traits were also estimated. The increase in the number of foliar fungicide applications provides an increase in grain yield, thousand-seed weight, daily increment, dry mass and harvest index, and also provides changes in crop cycle, chlorophyll content and a higher net margin, generating a greater gain revenue.

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Section: Environmentssupporting

confidence: 86%

Section: Effect Of the Number Of Pplicationsmentioning

confidence: 55%

Effects and management of foliar fungicide application on physiological and agronomical traits of soybean

Zambiazzi¹,

Bruzi²,

Carvalho³

et al. 2018

Aust J Crop Sci

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“…Regarding Asian rust severity, all the proposed treatments were lower when compared to the control treatment; however, the Fusã o ® /Aproach Prima ® /Sphere Max ® treatment obtained the worst scores among the fungicides, and this protocol was less effective to control P. pachyrhizi within the proposed program. Different results for disease severity in controls, but similar ones for fungicide mixtures were obtained by Barros et al (2008), who observed disease severity ISSN 2166-0379 2019 ranging from 2.8 with fungicide application (11 to 25% infected leaf area) to 5 (infected leaf area of 75 to 100%) in the control with no fungicides application. However, there was a significant reduction in ASR severity in treatments with fungicides mixtures (pyraclostobin + epoxiconazole), ranging from 0.06 to 0.56, which indicates the absence of leaf symptoms when the mixtures was applied three times.…”

Section: Asian Rustsupporting

confidence: 64%

“…The same authors achieved a productivity increase of up to 57% for TMG 7232 using 5 fungicide applications. Barros et al (2008) also showed an increase in productivity compared to the control of both cultivars (Vencedora and Conquista) treated with 3 fungicide applications. Therefore, it is emphasized that a strict control with sequential applications increases the producer's gains and decreases soybean losses during the cultivation of this commodity.…”

Section: Productivitymentioning

confidence: 84%

Evaluation of Fungicides to Control Asian Rust and Anthracnose in Soybean

Pereira

Martins

Lima

et al. 2019

JAS

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Soybean (Glicine max L.) is one of the most important crops from the economic standpoint for Brazil and due to the favorable climate for the development of fungal diseases, requires special needs. The fungal diseases with the greatest economic impact on Brazilian culture are Asian rust, caused by the fungus Phakopsora pachyrhizi and Anthracnose, caused by Colletotrichum truncatum. Together, without proper control, they can be devastating. Fungicides represent a high cost to producers, however, necessary for productivity losses do not decrease production. In this way, obtaining a combination of fungicides that provides results for the control of the diseases, from the beginning of the infestation period, with a satisfactory cost benefit is of the utmost importance to Brazilian producers. The objective of this study was to evaluate the combination of six commercial fungicides (APROACH PRIMA®, SPHERE MAX®, FOX®, FUSÃO®, ELATUSTM and ORKESTRA) and sequential applications in the control of anthracnosis and asian rust at the soybean cultivar “Monsoy 5947 IPRO”; besides establishing the best cost benefit for the application of these fungicides. The results show that all evaluated treatments presented statistically significant result, and suggest the use of Orkestra®/Aproach Prima®/Sphere Max® fungicides in sequential applications for the control of Asian rust and anthracnose in the region of Assis Chateaubriant, Paraná, Brazil.

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“…(1-y)]] Gompertz [y = -ln[-ln(y)]], foram ajustados ao modelo de regressão linear simples, tendo tempo em dias após emergência (DAE) como variável independente (CAMPBELL; MADDEN, 1990). Optou-se pelo modelo Gompertz, pois foi o que teve os melhores ajustes e estimou-se a taxa de progresso da doença (r), determinada pelo parâmetro b da equação de regressão.…”

Section: Methodsunclassified

Ferrugem asiática e produtividade da soja sob doses de potássio e fungicida, na safra 2007/08

et al. 2012

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O potássio é citado como um dos nutrientes que exerce maior influência sobre as doenças de plantas. Assim, objetivou-se com essa pesquisa avaliar o efeito da adubação potássica, sobre a incidência e severidade da ferrugem asiática e produtividade da cultura da soja, na região de Dourados-MS na safra 2007/08, com e sem fungicida. O experimento foi implantado num Latossolo Vermelho Distroférrico, cultivado em sistema de semeadura direta sobre palhada de milho. O delineamento experimental utilizado foi em blocos completos casualizados, com seis repetições onde os tratamentos foram alocados em parcelas subdivididas sendo nas parcelas cinco doses de K 2 O (0; 40; 80; 120 e 160 kg ha-1) e subparcelas (presença e ausência de aplicação de fungicida azoxistrobina+ciproconazol). Foram avaliadas incidência e severidade da ferrugem asiática, produtividade e a massa de 100 grãos. A aplicação de fungicida foi essencial para redução da incidência e severidade da ferrugem asiática e aumento da produtividade e massa de 100 grãos. Quando não houve aplicação de fungicida, a produtividade foi reduzida em 22%, ou seja, 574,1 kg ha-1. O mesmo ocorreu com a massa de 100 grãos que foi reduzida em 18,6%. A aplicação de fungicida e a dose de 80 kg ha-1 de K 2 O foram promissoras em diminuir os efeitos deletérios da ferrugem asiática com relação incidência no terço médio e superior e severidade no terço superior das plantas de soja.

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Efeito do número de aplicações de fungicidas no controle da ferrugem asiática da soja

Cited by 10 publications

References 1 publication

Effects and management of foliar fungicide application on physiological and agronomical traits of soybean

Effects and management of foliar fungicide application on physiological and agronomical traits of soybean

Evaluation of Fungicides to Control Asian Rust and Anthracnose in Soybean

Ferrugem asiática e produtividade da soja sob doses de potássio e fungicida, na safra 2007/08

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