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This study was conducted at the University of New Hampshire Kingman Farm located in Madbury, NH. The experimental design consisted of 18 treatments arranged in a randomized complete block with four replications per treatment. ‘Honeymoon’ sweet corn was hand-planted on 18 May in rows on 36 inch centers. Each plot consisted of a single 30-ft row of corn. The first application of each insecticide treatment was administered on 10 Jul when the corn plants were in the late whorl or pretassel growth stage (when approximately one-half of the plants have tassel growth visibly emerging from the whorls). All treatments received a second application on 16 Jul and selected treatments received a third and final application on 23 Jul. The insecticide treatments were applied using a R &amp; D CO2-pressurized (40 psi) single-nozzle hand-held sprayer. Each treatment was applied in a single pass over the row directed into the whorls at a delivery rate of 14.4 gal/acre. On 10 Jul, just prior to the first insecticide application, an evaluation was made of the percentage of plants showing ECB leaf feeding injury. The percentage of plants with ECB injured tassels was determined on 5 Aug. The percentage of injured stalks and ears was determined at harvest time (17 Aug and 19 Aug) by examining all the plants in each replicate for ECB feeding injury to both stalks and ears.

Early Season ECB Control on Sweet Corn, 1992