Disease Occurrence and Yield Response of Selected Peanut Cultivars as Impacted by Fungicide Inputs at Two Alabama Locations

摘要

Twelve runner market-type peanut cultivars were evaluated for their reaction to early leaf spot caused by Cercospora personatum, late leaf spot caused by Cercosporidium arachidicola, and rust caused by Puccinia arachidis along with stem rot caused by Sclerotium rolfsii in southeast Alabama at the Wiregrass Research and Extension Center (WREC) in Headland, AL and in southwest Alabama at the Gulf Coast Research and Extension Center (GCREC) in Fairhope, AL. A factorial design, arranged in split plot, with peanut cultivar as whole plots and fungicide treatments as sub-plots was used. Whole plots were randomized in four complete blocks. Subplots, which consisted of four 30-foot rows spaced 36-38 in apart, were randomized within each whole plot. Sub-plots included a standard 7-application Bravo Weather Stik fungicide program and a high input program consisting of Absolute 500F, Provost Opti alternated with Abound 2.08SC, and a final application of Bravo Weather Stik. Leaf spot intensity and rust were evaluated using the Florida leaf spot scoring system and ICRISAT 1-9 rust rating scale, respectively. Stem rot incidence was assessed immediately after plot inversion by counting the number of disease loci per row. Plots were mechanically combined several days after inversion and yields were reported at <10% moisture.