2022 Foliar Fungicide Impact on NC Soybean Yield (Randolph County Result Breakdown)

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In 2022, we tested the impact a foliar fungicide has on soybean yield in Randolph County and across the state. The results for the state are laid out below, but this article will focus on what was observed in Randolph County.

Our plot was planted in a double crop soybean/wheat field on July 1, 2022. Our target population was 100k plants/acre. Stand counts showed our actual population being 103k plants/acre. At V3 we made an application of Miravis Top at a rate of 13.7oz/acre to the treated plots. There was no disease present in the field at the time of application. 2 and 4 weeks after the application, more samples were sent to the Plant Disease Insect Clinic. The samples detected frogeye leaf spot as well as cercospora in the untreated plots (photo below). There was a visual difference in disease pressure between the treatments during this time, as well as at the time of harvest (photo below).

The results below show that there was not a significant increase in yield from the foliar fungicide treatments in Randolph County. 3 of the 10 trial locations in North Carolina saw a significant increase in yield from the foliar fungicide treatment. Further research will be conducted locally to understand the viability and profitability of foliar fungicide applications in soybeans.

Thank you to the producer, Ron Alcorn, for his participation in this trial.

2022 OFT Trial Summary

2022 OFT Trial Summary

Frogeye leaf spot on soybean

Frogeye leaf spot

Soybean field at harvest

Untreated soybeans on the left vs. treated soybeans on the right