2020
Optimizing Fungicide Applications for Management of Sclerotinia in Soybeans (2019)
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Contributor/Checkoff:
North Dakota Soybean Council
Category:
Sustainable Production
Keywords:
Crop protectionDiseaseField management
Parent Project:
Optimizing Fungicide Applications for Management of Sclerotinia in Soybeans
Lead Principal Investigator:
Michael Wunsch, North Dakota State University
Co-Principal Investigators:
Kelly Cooper, North Dakota State University
Project Code:
QSSB
Contributing Organization (Checkoff):
North Dakota Soybean Council
$45,052
Institution Funded:
North Dakota State University, Carrington Research Extension Center
$45,052
Brief Project Summary:

This project part of a three-year study to optimize fungicide spray deposition to the interior of the soybean canopy to control white mold. Field trials will be conducted utilizing boom-mounted nozzles and drop nozzles to quantify the impact of nozzle placement, droplet size, spray pattern, application pressure, water volume, boom height, and adjuvants on spray deposition within the canopy. Previous findings indicate fungicide delivery through drop nozzles improved fungicide deposition to the lower canopy, increasing Sclerotinia control. Researchers will develop recommendations for optimized performance of boom-mounted and drop nozzles.

Key Benefactors:
farmers, agronomists, applicators, extension specialists

Information And Results
Project Deliverables

Five sets of studies will be conducted:
(1) Impact of spray droplet size, extended range flat-fan TeeJet nozzles: 5.5 oz/ac Endura will be applied with five combinations of nozzles and application pressures emitting spray droplet sizes from fine to coarse and compared to a non-treated control. Spray volume will be 15 gal/ac, and a pulse-width modulation system will be utilized to maintain a constant driving speed across treatments.
(2) Impact of spray droplet size, flat-fan Wilger nozzles: 5.5 oz/ac Endura will be applied with four nozzles emitting spray droplet sizes from fine to coarse and compared to a non-treated control. Spray volume will be 15 gal/ac. Wilger produces flat-fan nozzles that maintain a constant output as spray droplet size changes, and application pressure, driving speed, and pulse width will be constant across treatments.
(3) Impact of organosilicone-based non-ionic surfactants: application rate (0.125% vs. 0.25% v/v) and efficacy of organosilicone-based non-ionic surfactants from two manufacturers will be compared to standard non-ionic surfactants from the same manufacturers, no surfactant, and a non-treated control. Applications will be made by tractor with standard boom-mounted nozzles and the fungicide Endura (5.5 oz/ac).
(4) Optimizing fungicide deployment with the 360 Undercover drop nozzle: the efficacy of five fungicides, applied either once (at R2) or twice (at R2 and 10-14 days later) will be compared to a non-treated control in applications made with standard boom-mounted nozzles versus drop nozzles.
(5) Optimizing soybean row spacing in soybeans receiving fungicide applications for white mold control: A non-treated control will be compared to Endura (5.5 oz/ac) applied once (at R2) versus twice (R2 and 10-14 days later) with drop nozzles versus boom-mounted nozzles in soybeans seeded in 21-inch and 30-inch rows.

Final Project Results

Update:

View uploaded report Word file

View uploaded report 2 Word file

See File 1 above for the Layman's terms report and File 2 for the technical report.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.