Anthony Drew, Commercial Agent, Levy County routinely monitors fungicide plot.

Fungicide Trial On Commercial Peanut

Commercial peanut production is a  challenging enterprise. Rainfall, relative humidity, day and night temperature (air and soil) are variable. As are pests including disease and insects. Likewise, wind and day length impact commercial peanut operations. One of the functions of  UF IFAS Extension is to demonstrate through applied research, the efficacy of new agricultural pest control products, under local conditions and do so in a scientifically valid, unbiased manner. Commercial peanut research conducted in Levy County during the 2017 fungicide trial yields surprising results.

  • test plot located within a section of commercial peanut farmed in Levy County
  • deep sandy soils of Levy County prove ideal for peanut production
    • fugal pathogens contribute to reduction of photosynthesis, leaf decline and poor peanut pod production
    • fungal pathogens constitute one of the major production problems in peanut production
  • Fungicide Trial:
  • Georgia 13M  variety was selected for trial to determine efficacy of new fungicide from Syngenta. Georgia 13M is a commercial peanut with

    Image 1 White flagged plots are not treated in fungicide trial. No fungicide applied.

    Image 1 White flagged plots with broad leaf weed mid-row.

little resistance to fungal leaf spot pathogens.

  • Treatments included an untreated plots (Image 1. White flags).
  • Traditional broad spectrum Chlorothalonil only plot. Seven spray applications (Image 2. Yellow flags) applied.

    Image 2 Traditional fungicide 7 treatments of chlorothalonil

    Image 2 Yellow flag Traditional fungicide treatment with chlorothalonil. 7 spray programs.

  • Current Syngenta preferred program based on the fungicides Elatus and Alto. Seven spray applications (Image 3. Orange flags) were applied.

    7 applications of Elatus and Alto

    Image 3 Orange flag with current preferred program for commercial peanut. 7 spray program.

  • Miravis treatment was applied in 5 spray program. That program included Miravis in concert with broad spectrum fungicide. The goal is to  prevent possible resistance issues. (Image 4. Blue Flags)

    Fungicide trial incorporated broad spectrum fungicide to prevent possible resistance issues.

    Image 4. Blue flag results demonstrate abundant leaf tissue.     5 spray program.

  • Challenges & Results:
  • Florida Automated Weather Network (FAWN), Bronson station reported 39.33 inches rainfall, April – September, 2017. This includes  Hurricane Irma. Prolong periods of leaf wetting exacerbate the incidence of leaf spot pathogens.
  • rain and high relative humidity resulted in prolonged periods of leaf wetting. This is conducive to increased fungal pathogen activity.
  • Given extremely high leaf spot pathogen pressure, variety susceptibility, long periods of leaf wetting and planting date, the research trial Syngenta program (based around the soon to be labeled Syngenta product) out performed other fungicide treatment programs. This was, in part, demonstrated by abundant photosynthetic leaf tissue remaining on the plants at harvest.
  • Miravis fugicide is not yet labeled. Expected to be labeled for use in 2018.
  • Peanut plants in trial fungicide plot were not harvested.
    Submitted by :
    D. Anthony Drew
    Extension Agent IV, Agriculture
    Questions? Call 486-5131 or email

Did You Know??
Economic Impacts (2014)
Agricultural and related industries generate
jobs (32.2% of total) in Levy County.
$215.5 million in revenues.
31.7% contribution to gross regional product.
Levy County, 2016 survey)



One Comment on “Fungicide Trial On Commercial Peanut

  1. Pingback: Melon and Peanut Forecast 2018 - UF/IFAS Extension Levy County

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