Eficácia Dos Fungicidas No Controle De Doenças De Final De Ciclo (Dfc) Da Soja

Niero, Anderson Roberto; Tratch, Renato; Pinto, Airton Rodrigues

doi:10.7213/cienciaanimal.v5i1.9564

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Seu tratamento é necessário, pois sob condições de infecção severa o fungo causa dano direto ao tecido foliar e impede a fotossíntese resultando em folhas secas que caem prematuramente, dando aspecto de soja dessecada por herbicida (NIERO et al, 2007).…”

Section: Introductionunclassified

Pulverização eletrostática nas culturas de soja e milho: efeitos na deposição de calda e eficácia biológica

Assunção¹

View full text Add to dashboard Cite

Section: Introductionunclassified

Pulverização eletrostática nas culturas de soja e milho: efeitos na deposição de calda e eficácia biológica

Assunção¹

View full text Add to dashboard Cite

Electrostatic Spraying Effect on Spray Deposition and Powdery Mildew Control in Soybean

et al. 2019

View full text Add to dashboard Cite

Electrostatic spray can bring benefits to the pesticide application such as the reduction of application rate and the increase of deposits on targets. Therefore, this study aimed to evaluate the effect of electrostatic spraying using lower application rates and different adjuvants on soybean spray deposition and chemical control of powdery mildew (Microsphaera diffusa Cooke & Peck). The field experiment was conducted in duplicate. A randomized complete block design with four replications in a 2 × 2 × 2 + 1 factorial scheme was used. The factors were two application rates, with and without droplet electrification, two spray solution compositions, and one additional treatment. Deposition on upper and lower leaves, spray loss to the soil, and powdery mildew control effectiveness were evaluated. The electrical conductivity of the spray solution and the charge/mass ratio induced in droplets were also evaluated. All treatments reduced the soybean powdery mildew severity. Electrostatic spraying responded positively to an increase in the electrical conductivity of the spray solution regarding the charge/mass ratio, but it did not increase spray deposition on the lower third of the canopy and did not influence spray loss to the soil, which was higher as the application rate increased.

show abstract

Relación entre la precipitación registrada en estados reproductivos de la soja y la severidad de Septoria glycines y Cercospora kikuchii

Carmona

Moschini

Cazenave

et al. 2010

Trop. plant pathol.

View full text Add to dashboard Cite

RESUMENDurante los años 2003 a 2008 se evaluó la severidad de las enfermedades de fin de ciclo (SevEFC, mancha marrón y tizón morado) en el estado fenológico R7 en localidades de las provincias de Santa Fe y Córdoba. Los valores de SevEFC (N=15) se categorizaron binariamente en función de un valor umbral en: epidemia severa (Sev EFC>36 %) y epidemia moderada a ligera (<=36 %). La variación de la SevEFC en R7 fue analizada en relación a variables ligadas a la precipitación, procesadas entre R3 y R5. Las variables se expresaron como frecuencia y precipitación acumulada en mm, que superan los umbrales: 1, 5, 7 y 10 mm. Las variables DPr7 (días con precipitación >7 mm), PrAc7 (acumulado de precipitaciones diarias >7 mm) y la interacción entre ambas (It7) resultaron ser las más fuertemente correlacionadas con los niveles epidémicos (coeficiente de Kendall Tau-b (r K = 0,74, 0,60 y 0,71 respectivamente). El modelo de regresión logística que incluyó a PrAc7 estimó correctamente la probabilidad de ocurrencia en 12 de las 15 observaciones de SevEFC. Los modelos logísticos que integraron las variables DPr7 o It7, obtuvieron precisiones de predicción de 93,3 %. Estos resultados podrían ser útiles para la predicción y control de las EFC. Palabras clave: Glycine max, enfermedades de fin de ciclo, modelos logísticos. were recorded at the R7 growth stage at several sites in Santa Fe and Córdoba Provinces. The annual LSDsev records (N=15) were grouped into two epidemic categories based on a threshold value (median of observed disease data): severe (LSDsev >36 %) and moderate to light (LSDsev <=36 %). Variations in epidemic levels were studied in relation to precipitation-based variables, processed in a time window limited by R3 and R5 growth stages. The variables were expressed as frequency (days) and total accumulation (mm) of daily precipitations greater than the thresholds 1, 5, 7 and 10 mm. The variables PrF7 (number of days with precipitations>7 mm) and AcPr7 (total accumulation of daily precipitations >7 mm) and the interaction (product) between them (It7) were the most strongly correlated, according to Kendall tau-b coefficients (r K =0.74, 0.60 and 0.71 respectively). Logistic regression model including AcPr7 correctly estimated the probability of occurrence of epidemic categories in 12 cases (out of 15). Logistic models integrating PrF7 or the interaction effect (It7) presented prediction accuracies of 93.3 %. These results could be useful for prediction and chemical control of LSD. Keywords: Glycine max, late season diseases, logistic models. logistic models. logistic models. ABSTRACT INTRODUCCIÓNDurante la campaña 2008/09, la Argentina alcanzó una siembra record de 17 millones de hectáreas de soja, constituyéndose en la mayor superficie sembrada en la historia del país con una única especie (SAGPyA, 2008). Casi la totalidad de la siembra correspondió a cultivares modificados genéticamente y la mayor parte se cultiva bajo siembra directa (SD). Este proceso de crecimiento estuvo acompañado por el avance de la frontera ...

show abstract

Eficácia Dos Fungicidas No Controle De Doenças De Final De Ciclo (Dfc) Da Soja

Cited by 3 publications

References 0 publications

Pulverização eletrostática nas culturas de soja e milho: efeitos na deposição de calda e eficácia biológica

Pulverização eletrostática nas culturas de soja e milho: efeitos na deposição de calda e eficácia biológica

Electrostatic Spraying Effect on Spray Deposition and Powdery Mildew Control in Soybean

Relación entre la precipitación registrada en estados reproductivos de la soja y la severidad de Septoria glycines y Cercospora kikuchii

Contact Info

Product

Resources

About