Foliar Fungicide & Insecticide Use in Soybeans


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Increased use of foliar fungicides in soybean-producing areas to help manage foliar diseases and increase yields. However, scouting fields is essential to determine the type of disease. And using best management practices will help reduce resistance.

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Foliar Fungicide & Insecticide Use in Soybeans

  1. 1. Foliar Fungicide and InsecticideUse in Soybeans
  2. 2. Foliar Fungicide Uses• Increase use of foliar fungicides in soybean-producing areas • Helps to manage foliar disease(s) • Potential way to increase yields• Need to scout fields and determine the type of disease(s) present • Fungicides only control fungal pathogens • Some fungal diseases not well-controlled by foliar fungicides due to time of infection or where Image courtesy of Case IH it occurs on the plant
  3. 3. Diseases Well-Controlled By Foliar FungicidesSeptoria brown spot Soybean Rust Pod and stem blight Soybean Rust Frogeye leaf spot Anthracnose Cercospora leaf blight
  4. 4. Diseases Not Well-Controlled By Foliar Fungicides Bacterial Blight Downy Mildew Sudden Death Charcoal Rot Syndrome White Mold Stem Canker
  5. 5. On-Farm Research Results• Pioneer conducted 148 trials from 2007-2011 comparing the yield of untreated soybeans to soybeans treated with foliar fungicide and 52 trials with an insecticide in the treatment• Locations: 11 states and two Canadian provinces• Average yield responses: • Foliar fungicide: 2.5 bu/acre • Foliar fungicide + insecticide: 5.3 bu/acre
  6. 6. On-Farm Research Results• Break-out of yield advantages by on-farm trial locations
  7. 7. Small-Plot Research Results• Pioneer conducted trials from 2004 to 2008 evaluating the effect of the Growth Rate strobilurin fungicides Headline and Treatment Stage per Acre Quadris and fungicide/insecticide Headline® R3 to R4 6 oz• Locations: Multiple sites in Illinois, Indiana, Iowa, Minnesota, and Nebraska Quadris® R3 to R4 6.2 oz• Average yield responses: Headline + • Headline: 3.7 bu/acre DuPont™ Asana® R3 to R4 6 & 6.4 oz • Quadris: 2.9 bu/acre Quadris+ • Headline/Asana: 5.5 bu/acre Warrior® R3 to R4 6.2 & 2.56 oz • Quadris/Warrior: 4.1 bu/acre
  8. 8. Small-Plot Research Results
  9. 9. Factors Influencing Disease Risk• Soybean variety – Soybean varieties differ in resistance to most common diseases. • Know which diseases are present in your fields and choose varieties that resist those diseases.• Weather conditions – Humid and wet weather conditions are the most favorable conditions for disease development. • Irrigation can also increase disease risk.• Disease pressure – Diseases survive in Image courtesy of Case IH soybean residue, increasing disease risk in continuous and notill soybeans
  10. 10. Resistance Prevention• Continual or indiscriminate use of fungicides or insecticides can accelerate resistance• The strobilurin class of fungicides is very effective at controlling many diseases, but represent a high risk for resistance development in fungal disease species • Resistance has recently been discovered in frogeye leaf spot• Scout and assess the need for these products• Follow best management practices, including rotating modes of action