An Evaluation of Fungicide Programs in Two Peanut Genotypes with Contrasting Disease Resistance
Applied Research
Ethan Carter
Regional Crop IPM Agent II
Jackson County Extension
Marianna
Abstract
Carter, E.T.*, UF/IFAS Jackson County Extension, Marianna, FL 32446; Tillman, B.L., Gomillion, M.W., Ichazo, L.C., North Florida Research and Education Center, Marianna, FL 32446; Dufault, N.S., Plant Pathology Department, The University of Florida, Gainesville, FL 32611.
Fungicides and cultivar selection are key components of a peanut integrated disease management plan. However, the interaction between these components on peanut diseases (e.g. white mold (Athelia rolfsii) and leaf spots (Passalora arachidicola; Nothopasslora personata) is unclear. The objective of this experiment was to quantify differences in disease response between peanut genotypes FloRun 331TM (FR331) and Georgia 06G (GA06) under seven Peanut Rx based fungicide programs and two controls. Leaf spot (LS) defoliation was estimated using the Florida 1-10 scale. Foliar disease onset occurred between 75 and 90 days after planting (DAP) with scale ratings ranging from 5 to 8 at 135 DAP. Stem rot incidence was recorded throughout the season as the number of 1-ft foci/90 ft of row with below ground hit ratings collected 148 DAP at digging. Fungicide program did not have an impact on stem rot hits, but incidence was numerically lower with FR331™ having 0.53 hits per treatment compared to GA06’s 2.75 hits. Yield responses related to fungicide program varied between cultivars, however, both cultivars saw significant (p < 0.01) yield savings when fungicides were applied. These yield savings were larger on average for GA06 (1,825 lb/acre) than FR331 (1,588 lb/acre), especially for chlorothalonil alone applications (GA06 = 1827 lb/acre, FR331=997 lb/acre). Cultivar resistance as well as yield potential is critical to determining the impact fungicide programs will have on yield savings.
Poster has NOT been presented at any previous NACAA AM/PIC
This poster is being submitted only for display at AM/PIC. Poster is not to be judged, but the abstract will be published in the proceedings.
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Authors: Ethan Carter, Barry Tillman, Mark Gomillion, Laura Ichazo, Nicholas Dufault
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Carter, E. RSA Agriculture/Pest Management, UF/IFAS Extension- Jackson County FACAA, Florida, 32448
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Tillman, B. UF/IFAS Peanut Breeder, UF/IFAS Extension, Florida, 32446
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Gomillion, M. UF Bio Scientist , UF/IFAS, Florida, 32446
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Ichazo, L. Graduate Student, UF/IFAS, Florida, 32446
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Dufault, N. UF/IFAS Extension Plant Pathologist, UF/IFAS Extension, Florida, 32611