Florida Peanut Federation Fund Request Proposal for 2019 Season

DATE: February 5, 2019

PRIMARY RESEARCHER(S): Dr. Nicholas S. Dufault, Extension Plant Pathologist; Keith Wynn, Hamilton County Agent;

COLLABORATOR(S): Dee Broughton, Regional Specialized Agent; Chris Vann, Lafayette County Agent; Dan Fenneman, Madison County Agent; Kevin Korus, Alachua County Agent; Jay Capasso, Columbia County Agent        

TITLE: Annual on-farm evaluation of Peanut Rx fungicide programs in North central Florida

OBJECTIVES: This ongoing research is designed to explore the efficacy of Peanut Rx fungicide programs critical to Florida peanut production. Typically, these fungicide programs are an important tool for managing the peanut diseases Sclerotium rolfsii (Stem rot or White mold); Cercospora arachidicola (Early Leaf Spot), Cercosporidium personatum (Late leaf Spot), Puccinia arachidis (Peanut Rust). Our objectives are to: 1.) annually evaluate the efficacy of Peanut Rx spray programs in a large plot (10 acre) environment; and 2.) to relate these results to stakeholders in a timely fashion through presentations, web based resources and publications (i.e. Peanut Rx).

In general, the proposed work for 2019 will provide stakeholders with an annual evaluation of fungicide products for control of peanut diseases and insights about disease development and spread throughout Florida.


Replicated on-farm field plots will be established in Hamilton county through the assistance of local peanut produce Mike Adams. These tests will be randomized complete block design with 3 to 4 replicates of each treatment evaluated. These field tests will evaluate fungicides and their application programs for controlling common foliar peanut diseases (i.e. Early & Late Leaf Spots, Rust). Fungicides for this portion will include, but are not limited to, chlorothalonil, tebuconazole, thiophanate-methyl as well as Peanut Rx programs for Syngenta, DuPont and Bayer. Disease incidence and severity will be monitored 2 to 3 times throughout the season. Yields and grades will be determined at harvest through cooperation with Suwannee River Peanut, a local peanut buying point.

Companies will donate base fungicides for their Peanut Rx programs, but generic band fungicides (e.g. chlorothalonil and tebuconazole) will need to be purchased for this research.

Note: A small plot trial will be conducted at Live Oak, FL using similar programs to provide comparisons with on-farm trials.  


($45.00 per gallon, 50 gallons required)
($38.50 per gallon, 10 gallons required)
($134.00 per gallon, 10 gallons required)
($43.00 per gallon, 5 gallons required)
Total Project Costs $4,190.00

The funds requested would be for an in-kind donation of 10 cases of chlorothalonil, 2 cases of tebuconazole, 1 case of Topsin-M and 2 cases of Abound. These products important components of the Peanut Rx programs that will supplement sprays for various company programs focused on their products. Estimated numbers of applications in 10 acre treatments are 25 applications of chlorothalonil, 10 applications of tebuconazole, 6 applications of Topsin-M and 4 applications of Abound.