Soil Insecticide and Fungicide Treatment Effects on Lesser Cornstalk Borer Injury, White Mold Incidence, and Peanut Yield, 1993

Abstract

Abstract Granular soil insecticides were evaluated in standard (Bravo) and developmental (Folicur or Moncut) fungicide programs for effects on LCB damage, disease incidence, and yield. The test was conducted on a Marlboro sandy loam in Barnwell County, SC. The experimental design was a RCB with 5 replicates. The experimental unit was a plot 50 × 25 ft (8 rows on 38-inch spacing). Granular insecticides were applied with a 2-row electric Gandy applicator, using 5-inch banders centered over the row. Foliar fungicides were applied with a tractor-mounted 8-row boom (8003 nozzles, 40 psi, 20.8 gal/acre for first 3 appl. dates; TX6 nozzles, 60 psi, 12 gal/acre for last 4 appl. dates). Traffic lanes were confined to rows 1-2 and 7-8 of each plot so there was no traffic on yield rows after granular insecticide applications. LCB damage counts were taken on 19 Jul by uprooting 2 plant clumps (1-4 plants/clump) per plot, and counting LCB feeding sites on plant crowns and laterals. LCB damage was evaluated again on 30 Aug by uprooting 1 row ft at 2 sites per plot, and counting LCB scarified pods. Pod damage was evaluated at harvest by counting external and internal pod injury on four 25-pod samples per plot within 24 h of digging. Disease incidence was evaluated within 1 h of digging by scanning 100 row ft per plot and estimating total row ft with white mold symptoms at the plant crown. Yields were taken from 100 row ft per plot.