National Cotton Council of America
Beltwide Cotton Conferences
January 8-11, 2008
Gaylord Opryland Resort and Convention Center
Nashville, Tennessee
The Cotton Foundation

Recorded Presentations

Thursday, January 10, 2008 - 2:30 PM

Association of External Stink Bug-Induced Cotton Boll Damage with Internal Damage, Lint Yield and Quality

Eric Blinka1, John W. Van Duyn1, Ames Herbert2, Sean Malone2, Phillip M. Roberts3, Jack S. Bacheler1, and J.R. Bradley1. (1) North Carolina State University, Box 7613, Raleigh,, NC 27695, (2) Virginia Tech, Tidewater AREC, 6321 Hollant Rd., Suffolk, VA 23437, (3) University of Georgia, PO Box 748, 4604 Research Way, Tifton, GA 31793

Seven cotton fields across northeast North Carolina in 2006 and nine across northeast North Carolina and southeast Virginia in 2007 were identified having stink bug levels above economic threshold.  Cotton fields consisted of Bollgard II varieties to limit the impact of caterpillar damage.  At each location, two cohorts of bolls were sampled.  The first cohort was removed when field reached quarter sized bolls.  These bolls were removed from the plant and external sunken lesions were identified and counted.  Bolls were then dissected and internal damaged identified and counted (warts, damaged seeds, destroyed locks).  During examination of the first cohort, a second cohort was identified in the field and external sunken lesions counted.  Second cohort bolls were then marked with tags and allowed to remain in the field until black seed coats were formed.  Following black seed coat, the second cohort was removed from the field and internal damage was identified and counted.  The locks of cotton from cohort two were then allowed to fluff out and were ginned through a table top-gin to determine grade and lint quality.