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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. While many factors are uncontrollable, cultural practices impact row crop yields.

One function of UF IFAS Extension is to demonstrate, through applied research, the efficacy of new agricultural pest control products. Rigorous standards are met to produce scientifically valid and unbiased outcome. Trials are conducted under local growing conditions.  A fungicide trial, on commercial commercial peanut yielded surprising results.

  • test plot located within a section of commercial peanut farmed in Levy County
  • deep sandy soils of Levy County are 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 on Commercial Peanut:

A new Syngenta fungal product was tested on Georgia 13M commercial peanut. Georgia 13M has little resistance to fungal leaf spot pathogens.

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

A.  Plot is not treated. No fungicide applied.

  • A. (white flag) – Untreated plot. Sparse foliage and broad leaf weeds, mid-row.
  • B. (yellow flag)– Traditional broad spectrum Chlorothalonil only. Seven spray applications applied.
  • C. (orange flag) – Current Syngenta preferred program based on Elatus and Alto fungicides. Seven spray applications were  applied.
  • D. (blue flag) – Miravis treatment was applied in five spray program. Program included Miravis in concert with broad spectrum fungicide. Producers prevent possible resistance issues by alternating modes of action.
Image 2 Traditional fungicide 7 treatments of chlorothalonil on commercial peanut. Chlorothalonil supply is expected to be reduced by 70% in 2018.

B.  Chlorothalonil, broad spectum program only.

7 applications of Elatus and Alto

C.  Current preferred chlorothalonil program on commercial peanut.

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

D.  Miravis treated plot.

Challenges & Results:
  • 39.33 inches of rain was recorded at the Florida Automated Weather Network (FAWN), Bronson station. Furthermore, the April – September, 2017 time frame includes Hurricane Irma precipitation.
  • Consequently, rain and high relative humidity resulted in prolonged periods of leaf wetting. This is conducive to increased fungal pathogen activity.
  • In conclusion, despite extremely high leaf spot pathogen pressure, variety susceptibility, long periods of leaf wetting and planting date, the trial Syngenta program out performed other fungicide treatment programs. abundant photosynthetic leaf tissue up until harvest demonstrates effectiveness.
  • More research will be conducted on Miravis fugicide. 
  • Fungicide trial peanuts were not harvested for consumption. 

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