Updated: July 6, 2021
By Andrew Kness

Checklist for Fusarium Head Blight Fungicide Applications

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.

This article appears in the Agronomy News May 2021 (Volume 12, Issue 2 ).

Agronomy News, May 2021, Vol. 12, Issue 2

Agronomy News is a statewide newsletter for farmers, consultants, researchers, and educators interested in grain and row crop forage production systems. This newsletter is published once a month during the growing season and will include topics pertinent to agronomic crop production. Subscribers will receive an email with the latest edition.