Abstract
Abstract This experiment was conducted to assess the performance of Bacillus thuringiensis (Bt) transgenic corn hybrids (100- and 105-day RM) and comparable non-Bt hybrids against a natural ECB infestation in southern Minnesota. Plots, each measuring 50 ft by 8 rows (30 inch row spacing), were established in Webster clay loam soil on 2 May at a rate of 33,000 seeds per acre. Plots were arranged in a RCB with four replications. ECB injury assessments for first generation on 15 Aug included % shotholing from the center two rows of each plot and leaf injury ratings (1 to 9 scale) from 10 plants per plot. Tunnel length and number from first generation were measured from 10 plants per plot on 18 Aug. Measurements for second generation ECB on 7-10 Oct included cumulative tunnel length and number, fall larvae, ear and shank damage from 10 plants per plot. Plants were harvested on 23 Oct and yields were corrected to 15.5% moisture.
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