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Cornfields located near Aurora, Cavour, and Garretson in central and east-central SD were chosen for this study. The experiment was conducted to compare the efficacy of traditional (banded or in-furrow) planting-time insecticide application methods with cultivation-time rescue treatments for controlling corn rootworm larvae. Experimental design was a RCB with 4 replications. Individual treatment plots consisted of single 15.2-m long rows spaced 96.5 cm apart. Pioneer IR-3751 (100-day) corn seed was planted at approximately 23,000 kernels per acre at each location. Planting-time granular formulations were applied using Noble metering units mounted on a specially-adapted Kinze 4-row corn planter, and all units were calibrated on the planter prior to insecticide applications. Banded granular treatments were applied in an 18-cm swath in front of the furrow-closing wheels, and incorporated by the wheels and drag chains. All planting-time applications (banded and in-furrow) consisted of directing insecticides immediately between double-disk furrow openers and into the open seed furrow. Post-emergence banded applications of Furadan 4F were placed over the row in 18- to 20-cm swaths using a single-nozzle (Teejet 8003 flat fan) boom. Broadcast ("Broad") liquid treatments were applied with a 1.8-m boom-equipped with 4 Teejet 8003 flat fan nozzles spaced 46 cm apart. Liquid formulations (planting-time and post-emergence rescue) were applied using a CO2-powered canister spray system calibrated to deliver 20 gpa at 3 mph. All post-emergence treatments were applied at cultivation time, and those that received cultivation following application were incorporated using a 2-row John Deere cultivator. Five roots per replicate were dug, washed, examined for feeding damage and rated using the Iowa 1 to 6 scale. Data were analyzed with SAS’s General Linear Models procedure and means were compared using DMRT.

Planting-Time and Rescue Applications of Furadan 4F for Control of Northern and Western Corn Rootworm Larvae in South Dakota, 1994