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Performance of BG/RR and RR Varieties in Systems Trials across the Mid-South and Southeast

Ken E. Lege', David W. Albers and Tom A. Kerby


ABSTRACT

Following several years of light to moderate Lepidopteran insect pressure in cotton in the Mid-South and Southeast, the value of Bollgard® technology is being questioned by many growers. Since the demand for Roundup Ready® varieties remains very high across these regions, most growers need information regarding the value of planting Bollgard®/Roundup Ready® (BR) varieties over Roundup Ready® (RR) varieties. Systems trials were established that directly compared BR varieties and RR varieties planted in the same field, but managed for their respective transgenic technology across the two regions. Average yield and crop value performance of BR varieties were significantly greater than that for RR varieties, regardless of sub-region (Lower Southeast, Upper Southeast, Lower Mid-South, Upper Mid-South) or maturity classification (early maturity of full season). After considering estimated total insect control costs, including insecticide costs, application costs, and Bollgard® technology fees, BR varieties provided an additional $20.34 to $63.75 per acre relative to the RR varieties. The highest difference between technology types was found in the Lower Mid-South sub-region. The lowest difference, though still positive, was found in the Upper Mid-South sub-region. Differences in net value per acre between BR and RR varieties in the Southeast ranged from $30 to nearly $40.





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Document last modified May 20, 2002