First-position bolls are the greatest contributor to overall yield. Protecting just one additional boll per plant can result in significantly higher lint yields.
Source: Bt cotton comparison – Jeremy Green (Clemson) – SC 2008-2010. Mike McCarty (Consultant) – SC 2008-2009, Gus Lorenz (Univ. of Arkansas) – AR, 2008-2010, Angus Catchot (Miss State U.) – MS 2008; 2002-2010 Systems Trials