Abstract
Abstract ‘Jubilee’ sweet corn was planted at the Arlington Agriculture Research Center, Arlington, WI at 23,000 seeds per acre on 29 June. Each treatment was 6 rows wide and 60 feet long, arranged in a randomized complete block design, replicated four times. The first spray was applied 29 Aug when the crop started to pollinate. Subsequent sprays were applied 3, 9 and 16 Sep. All treatments were applied with a high clearance sprayer equipped with D2/23 TeeJet disc-core nozzles calibrated to deliver 10.7 gallons of finished spray per acre at 40 PSI when driven at 2.5 MPH. Plots were evaluated 26 Sep by removing 25 ears per treatment and recording number of damaged ears and the size of larvae present. “Early” CEW larvae were shorter than 1/2 inch, “Mid” larvae were longer than 1/2 inch but shorter than 3/4 inch and “Late” larvae were longer than 3/4 inch. “Early” ECB larvae were shorter than 1/4 inch, “Mid” larvae were longer than 1/4 inch but shorter than 1/2 inch, and “Late” larvae were longer than 1/2 inch.
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