Effect of Seed Treatment on Early Season Brown Spot Caused by Septoria glycines of Soybean

Abstract

Early season brown spot caused by Septoria glycines was compared in Illinois, Indiana, Iowa, Michigan, and Ontario, Canada, soybean fields planted with differing commercial seed treatments. Seed treatments that included fluopyram significantly reduced brown spot (P < 0.001). A greenhouse mist chamber experiment revealed that fluopyram seed treatment reduced the Area Under Disease Progress Curve of brown spot over a 6-week period (P < 0.001). Brown spot severity was unaffected by plant age at inoculation for the control treatment without fluopyram (P = 0.911); however, severity increased with plant age at inoculation for the fluopyram treatment (P = 0.009). The sensitivity of two S. glycines isolates to fluopyram was assessed by determining the effective concentration required to reduce its colony diameter growth in culture by 50% (EC50). Both isolates had an EC50 of 0.41 μg/ml of fluopyram. These results demonstrate that fluopyram seed treatment is effecttive at controlling early season brown spot in soybean. Accepted for publication 19 September 2016.

In vitro sensitivity assessment of late season soybean pathogens to fungicide mixtures

“…These EC 50 values are more likely to occur biologically and are similar to previous reports from the literature (Price et al 2015;Batzer et al 2016). In the present study, for two of the three fungi analyzed (C. kikuchii and P. phaseoli), the W1.4 model provided the lowest EC 50 .…”

Evolución de la mancha marrón (Septoria glycines) en diferentes sistemas de producción de soja (Glycine max)

“…Bajo condiciones favorables para la planta y desfavorables para la enfermedad, el cultivo de soja se recupera de las infecciones tempranas de la MM. En el patosistema cultural de la MM es importante evaluar las diferentes medidas de manejo cultural, como podrían ser la fecha y densidad de siembra, el distanciamiento entre hileras, el uso de cultivos de cobertura, entre otras (Batzer et al, 2016;Cruz et al, 2010;Hartman et al, 2015), combinándolo con el manejo genético de la enfermedad (Brogin et al, 2003).…”

Genome‐wide transcriptional response of the causal soybean sudden death syndrome pathogen Fusarium virguliforme to a succinate dehydrogenase inhibitor fluopyram

“…Fluopyram is a succinate dehydrogenase inhibitor (SDHI) fungicide and is widely used as a seed or foliar treatment for management of fungal diseases such as brown spot ( Septoria glycines ), gray mold ( Botrytis cinerea ), cherry leaf spot ( Blumeriella jaapii ) and white mold ( Sclerotinia sclerotiorum ) 7–10 . Fluopyram is also an efficacious fungicide as a seed treatment to manage soybean SDS caused by F. virguliforme 11–13 .…”

“…3,6 Fluopyram is a succinate dehydrogenase inhibitor (SDHI) fungicide and is widely used as a seed or foliar treatment for management of fungal diseases such as brown spot (Septoria glycines), gray mold (Botrytis cinerea), cherry leaf spot (Blumeriella jaapii) and white mold (Sclerotinia sclerotiorum). [7][8][9][10] Fluopyram is also an efficacious fungicide as a seed treatment to manage soybean SDS caused by F. virguliforme. [11][12][13] Although utilizing diseaseresistant plant cultivars is the most cost-effective disease management strategy, resistance to SDS is limited due to a lack of soybean cultivars with complete resistance and the significant influence of environmental factors on SDS development.…”