CORN ROOTWORM MANAGEMENT USING COMBINATIONS OF ROOTWORM AND NON-ROOTWORM TRAITED CORN WITH AND WITHOUT FORCE 3G INSECTICIDAL MATERIALS, 2013

Abstract

Corn rootworm (NCR/WCR) management efficacy trials were conducted to evaluate transgenic insect-resistant hybrids and granular insecticide combination treatments near Bryant, Cavour and Colman in South Dakota. Granular applications were made by using four rows (approximately 50 ft long; spaced 30 inches apart) treatment plots at planting-time. Experimental plots were arranged in an RCB design with four replications. Granular insecticides were applied with Noble metering units or SmartBox delivery system. All metering units were calibrated on the planter before treatment applications and mounted on a 4-row Kinze corn planter. In-furrow treatments were placed directly between double-disk openers and into the open seed furrow. Hybrids evaluated included: ‘Pioneer Optimum AcreMax1’ (‘OAM1’) ‘Pioneer 38H03AM1’, ‘Agrisure 3122’ ‘Syngenta Agrisure3122’, ‘VT Triple’ (‘VT3’) ‘Monsanto/DeKalb DKC43-27’, ‘Genuity VT Triple Pro’ (‘GEN SS 95:5RIB’) ‘Monsanto/DeKalb DKC49-29RIB’, ‘Genuity VT Triple Pro’ (‘GEN SS 90:10RIB’) ‘Monsanto/DeKalb DKC52-04RIB’, and Roundup Ready2 (RR Hybrid) ‘Monsanto/DeKalb DKC52-62’. Corn seed was planted at a rate of approximately 30,000 kernels per acre. Six roots per replication were dug randomly from the two outer rows, washed and rated using the Oleson 0 to 3 root injury rating scale. The center two rows were used for yield assessments. Yield and root rating data were analyzed by using SAS version 9.2 PROC MIXED/PDIFF option with Saxton’s lettering macro.