Adepidyn is a new fungicide from Syngenta, marketed under Miravis Neo and Miravis Top for soybeans, and combines active ingredients from FRAC groups 3, 7 and 11. The product is touted for having superior management of foliar diseases of soybean, reduced risk of fungicide resistance, and plant health benefits to bump yields (mainly stay-green/green stem properties) even in the absence of disease. Limited university research on Miravis’ utility in soybeans has been conducted.

We propose to evaluate Miravis’ effect on yield, plant health, and stay-green properties on full season soybeans in Maryland through replicated field trials. During the course of this two-year project, we will measure the effect of adepidyn on foliar fungal disease and yield on full-season soybeans in Maryland. This will be the second year of this study.

Data and education in the form of extension articles and presentations regarding the efficacy of Miravis for soybean production in Maryland.

Updated July 29, 2020:
Fungicide trials were established at the Western Maryland Research and Education Center (WMREC) in Keedysville,
MD on May 5, 2020 and the Wye Research and Education Center in Queenstown, MD on May 21, 2020. Both trials
were no-tilled into soybean residue using a no-till drill set on 7.5-inch rows at a seeding rate of 150,000 seeds/acre.
R1 fungicide treatments were applied at WMREC on July 7, 2020. Treatments receiving a second application were
applied on July 21, 2020. R1 fungicide applications were made at the Wye on July 15 and the second application
will occur on or about July 29, 2020.

Foliar disease ratings will be assessed if disease pressure is high enough to warrant a rating. Thus far, disease
pressure has been low due to the weather conditions. NDVI (plant greenness) ratings will be recorded using a
handheld GreenSeeker after fungicide application up until physiological maturity. Green stem ratings will be
recorded as plants approach maturity. Yield and harvest data will be collected using a small plot combine.
Statistical analysis will be completed after all data is collected.

View uploaded report

Updated January 29, 2021:

View uploaded report

The 2020 growing season at Wye and WMREC were very different. Wye received 47 inches of rain from May 1-November 1, 2020, while WMREC revived 19.8 inches over that same timeframe (Appendix 1 & 2). Wye plots also had a severe infestation of herbicide-resistant marestail that likely lowered the yield potential and affected the severity and incidence of FLS. All fungicide treatments significantly reduced FLS severity at both locations. All fungicide treatments affected NDVI by keeping the plants greener for longer, as well as increased the occurrence of green stem.

For the second year in a row we observed a significant increase in yield from fungicide-treated plots at the higher yielding, early planted trial location, with Miravis treatments performing significantly better than Priaxor and Priaxor performing better than the untreated control. No yield differences were detected at WMREC, which is likely due to the very low and poor yields due to droughty conditions and disease was not likely the major yield-limiting factor.

Combined 2019 and 2020 data reveal a significant 6-9 bushel increase in yield with the Miravis treatments, and a 3-5 bushel increase in yield with Priaxor. Based on this data and data from other institutions, Miravis may benefit soybean production by providing protection against common foliar diseases of soybean and help increase yields under early planted, high yield potential soybeans.

Information regarding the efficacy of a new fungicide on the market for soybeans. Information on disease control and yield will help farmers determine if this product is a worthwhile investment.