Reduction of white mold level on soybean by fungicide management strategies

Abstract

ABSTRACT:The objective of this study was to verify the efficiency of the control of white mold on soybean with the use of fungicides applied alone and in rotation, at different growth stages and in a mixture of two active ingredients at three locations: Arapoti, PR, Mauá-da-Serra, PR and Pinhão, PR, Brazil. The fungicides used were carbendazim (Ca), thiophanate methyl (Tm), procymidone (Pr) and fluazinam (Fl). The experiments consisted on 17 treatments and 4 replications in a randomized block design. The analyzed variables were severity, incidence, number of sclerotia and yield. Mauá-da-Serra and Pinhão presented the highest incidences (31% and 29.8% in the control, respectively). At these two locations most of treatments with fungicides decreased the incidence and production of sclerotia, when compared to control; however, no differences in terms of yield were observed. Arapoti presented the lowest incidence (15.8% in the control) where most of treatments with fungicides did not present differences for the variables incidence, production of sclerotia and yield, when compared to the control. No differences were also observed for severity in any of three locations. In conclusion, fungicides applied in soybean areas with historically white mold incidence up to 31% can reduce the disease incidence and sclerotia production levels.

Aspectos Fitossanitários da Agricultura 2

“…Algumas de difícil manejo como o mofo branco (Sclerotinia sclerotiorum (Lib.) de Bary) podem causar danos da ordem de até 70% (JACCOUD FILHO et al, 2010) e são objeto de estudos que visam estratégias de manejo químico (WUTZKI et al, 2016). Um complexo de doenças que prejudicam o potencial de rendimento da cultura podem ser verificadas na literatura (HENNING, 2009;GODOY et al, 2016).…”

Impacto do controle do mofo-branco com fluazinam na produtividade da soja no Sul do Paraná: metanálise

“…Os critérios para inclusão dos estudos foram: 1) Experimentos apresentando o controle químico de mofo branco da soja através de aplicação foliar e resposta em produtividade; 2) Trabalhos conduzidos na região central-sul do Paraná 3) Estudos apresentando concentração de ingrediente ativo aplicado, época e número de aplicações; 4) Trabalhos que apresentavam informado medidas de variabilidade e dispersão de dados como coeficiente de variação (CV) e número de repetições. Devido ao baixo número de trabalhos publicados ou que não atendiam os parâmetros estabelecidos, como o caso do estudo de Wutzki et al (29) conduzido na região mas sem apresentar medidas de variabilidade, foram incluídos na análise parte dos dados utilizados na dissertação de Tupich (27).…”

FUNGICIDES AND BIOCONTROL AGENTS IN REDUCING CARPOGENIC GERMINATION OF SCLERODIA Sclerotinia sclerotiorum in vitro

“…The apothecia release ascospores that are disseminated by the wind and need to find an exogenous source of nutrients and a film of water to start the infection process (BOLAND & HALL, 1987). Clarkson et al (2003) consider that sclerotia represents the main source of inoculum and is also a fundamental part of the pathogen's life cycle; however, the basis of disease control today consists of protecting the pathogen's infection sites through chemical products (SUMIDA et al, 2015;WUTZKI et al, 2016). Although fungicides provide partial protection to crops, there is no information that they provide control of resistance structures present in the soil (TU, 2003).…”