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Efficacy of Grower-Managed Bt Cotton in North Carolina

J.S. Bacheler, D.W. Mott and D.E. Morrison


 
ABSTRACT

In the first large-scale evaluation of the efficacy of commercial Bollgard cotton grown and managed by producers in North Carolina, a statewide, 11-year survey of caterpillar- and stink bug-damaged bolls was expanded in 1996 to include 116 Bollgard, 116 paired conventionally-protected fields (a non-Bollgard field grown in close proximity to the Bollgard field, and typically managed by the same producer), and 180 additional randomly-selected, conventionally-protected fields, for a total of 412 fields. The efficacy of Bollgard cotton, primarily NuCOTN 33b, and various commercial, conventionally-protected (essentially pyrethroids), varieties was compared for boll damage from the cotton bollworm (Helicoverpa zea) (Boddie), the European corn borer (Ostrinia nubilalis) (Hubner), the fall armyworm,(Spodoptera frugiperda) (J.E. Smith) and stink bugs, primarily Acrosternum hilare (Say) and Euschistis servus (Say). In each field, a 100-boll sample was evaluated for damage from the above species.



Reprinted from Proceedings of the 1997 Beltwide Cotton Conferences pp. 858 - 861
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998