Influence of Adjuvants on Leafspot Disease Management

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Presentation transcript:

Influence of Adjuvants on Leafspot Disease Management March 6, 2019 Dr. Corey Guza Michigan Sugar Company

Introduction Leafspot management (Cercospora and Alternaria) continues to be a challenge for Michigan Sugar Company growers. Growers are spraying 8 to 10 times to manage disease. Can adjuvants improve fungicide efficacy? Can improved efficacy result in increased sugarbeet yield (RWSA)?

Diligence Wilbur Ellis Adjuvants Deposition Aid-Canopy Penetration-Coverage-Spreader-Sticker & Drift Control Agent Masterlock WinField United Extender and Sticker Reguard Wilbur Ellis Deposition Aid-Drift Control Agent Diligence Wilbur Ellis

Materials and Methods Fungicide Rate Timing Super Tin 8 fl oz/A 14 day EBDC 2 lb/A 10 day Copper 2 pt/A 7 day EBDC* 7-14 day Adjuvant Rate Masterlock 6.4 oz/A Reguard 12 oz/A None Reguard + Diligence* 12 oz/A + 2 oz/A *2018 *2018

Materials and Methods Plot size: 6 rows (22 inch) x 38 ft 6 replications Monosem research planter 4.1 inch seed spacing Final population of 200 beets/100 ft Compressed air small plot sprayer 3 mph 25 gallons per acre 100 psi Flat Fan nozzles Data Analyzed w/ARM Fishers LSD 5%

Materials and Methods Evaluations, 3 years, 2016-2018: Percent leaf damage from leafspot late Sept - early Oct Root Yield (RWSA)

Results – Super Tin C B A 2016

Results – Super Tin A A A 2017

Results – Super Tin B A A A 2018

Results - Copper B A A 2016

Results - Copper B A A 2017

Results - Copper A A A A 2018

Results – EBDC 10 Day Interval 2016

Results – EBDC 10 Day Interval 2017

Results – EBDC 10 Day Interval AB A A 2018

Results - EBDC(7 Day Interval) AB A A A 2018

Results – EBDC 10 Day Interval AB A A 2018

Results - EBDC(14 Day Interval) AB A A A 2018

Results – EBDC 10 Day Interval 2016

Results – EBDC 10 Day Interval 2017

Results – EBDC 10 Day Interval AB B B 2018

Results - Summary Super Tin Copper EBDC Triazole All adjuvants increased control Some may cause injury Copper Influenced the least by the addition of any adjuvant Some times can reduce control Risk of crop injury EBDC Shorter application intervals equals better control No Sticker at 7 days is better than any treatment at 10 days Triazole Generally tankmixed with EBDC Choose an adjuvant that is effective with EBDC Some triazoles require additional surfactant

Remarks Adjuvants generally improve leafspot control Hot humid weather conditions can cause leaf injury Adjuvants are not “extenders” When used appropriately adjuvants can improve disease control from using fungicides and as a result increase sugarbeet yield.

Thank You! Dr. Corey Guza Michigan Sugar Company