Tag: fungicides

2022 Corn, Soybean, and Wheat Fungicide Efficacy Tables

Andrew Kness, Agriculture Agent | akness@umd.edu
University of Maryland Extension, Harford County

Each year, data from Universities around the country are aggregated and used to update fungicide efficacy guides for corn, soybean, and wheat. These tables are put together by the Crop Protection Network and can be found on cropprotectionnetwork.org.

These tables serve as handy reference guides to determine the best chemistry to manage certain diseases. The ratings in the table reflect the relative efficacy of a product to manage a given disease, it does not rate yield response to a fungicide. Links to the tables are found below, or contact your Extension agent for a copy.

Soybean seedling diseases

Soybean foliar diseases

Corn foliar diseases

Wheat foliar diseases

Checklist for Fusarium Head Blight Fungicide Applications

Andrew Kness, Agriculture Agent
University of Maryland Extension, Harford County

As wheat approaches flowering, here is a final list of reminders/tips to make the most of your fungicide applications that are targeted to manage Fusarium head blight (head scab):

  • Use an effective fungicide. These include: metconazole (Caramba®), prothioconazole + tebuconazole (Prosaro®), prothioconazole (Proline®), and adepidyn (Miravis Ace®).
  • Apply an effective fungicide at the correct time. The most effective application window is from flowering (anthesis; Feekes 10.5.1) + about 5-6 days after. Late applications (4-6 days after anthesis) are better than early heading/head emergence (10.3) applications at reducing DON content in the grain.
  • Apply fungicides using the correct equipment. Ground applications should be made with 80-degree flat fan nozzles angled down from horizontal. For ground applications made at speeds over 6 mph, use a single nozzle angled forward, 30 degrees down from horizontal. For ground applications less than 6 mph, better coverage is achieved with dual forward and rearward facing nozzles, angled 30-45 degrees down from horizontal.
  • Sprayer should be operated to achieve droplet sizes of 300-350 microns.
  • Use 10-20 gallons of water per acre and keep the spray boom 8-10 inches above the crop.
  • For aerial applications: Use 4-5 gallons of water per acre. Fine to medium sized droplets (300-350 microns). Small aircraft should operate 8-10 feet above the crop; large aircraft 10-12 feet. Nozzles should be mounted to cover 65% of the aircraft’s wingspan and mounted as low as possible.
wheat at start of anthesis
Wheat at Feekes 10.5.1. Image: A. Kness, Univ. of Maryland

 

Checklist For Head Scab Fungicide Applications

Andrew Kness, Agriculture Agent
University of Maryland Extension, Harford County

wheat infected with head scab
Wheat infected with Fusarium head blight. Image: A. Kness, University of Maryland.

Wheat in the southern parts of Maryland will soon be flowering and the rest of the Maryland wheat crop will follow suit over the next few weeks. As wheat approaches flowering, here are a final list of reminders/tips to make the most of your fungicide applications that are targeted to manage Fusarium head blight (scab):

  • Use an effective fungicide. These include: metconazole (Caramba®), prothioconazole + tebuconazole (Prosaro®), prothioconazole (Proline®), and adepidyn (Miravis Ace®).
  • Apply an effective fungicide at the correct time. The most effective application window is from flowering (anthesis; Feeks 10.5.1) + 6 days after. Late applications (5-7 days after anthesis) are better than early heading/head emergence applications at reducing DON content in the grain.
  • Apply fungicides using the correct equipment. Ground applications should be made with 80-degree flat fan nozzles angled down from horizontal. For ground applications made at speeds over 6 mph, use a single nozzle angled forward (towards the grain heads), 30 degrees down from horizontal. For ground applications less than 6 mph, better coverage is achieved with dual forward and rearward facing nozzles, angled 30-45 degrees down from horizontal.
  • Sprayer should be operated to achieve droplet sizes of 300-350 microns.
  • Use 10-20 gallons of water per acre and keep the spray boom 8-10 inches above the crop.
  • For aerial applications: Use 4-5 gallons of water per acre. Fine to medium sized droplets (300-350 microns). Small aircraft should operate 8-10 feet above the crop; large aircraft 10-12 feet. Nozzles should be mounted to cover 65% of the aircraft’s wingspan and mounted as low as possible.