Azoxystrobin, butralin, and flumetralin residues in flue-cured tobacco

Abstract

As part of a continuous effort at North Carolina State University, research was conducted from 2007–2009 to establish the maximum expected pesticide residue on flue-cured tobacco that would result from a maximum labeled application rate and minimum preharvest interval of specific crop protection agents (CPAs). Residues of azoxystrobin, butralin, and flumetralin were measured on flue-cured tobacco over 6 environments in North Carolina during the research cycle. Butralin and flumetralin were applied via broadcast (BC) and downstalk (DS) application. Treatments were applied to tobacco grown on research stations near Clayton and Kinston, NC. Tobacco was managed according to NC Cooperative Extension Service recommendations and harvested 4 times by stalk position. Residues on cured leaf were quantified by Global Laboratory Services, Inc., in Wilson, NC. Data were analyzed and reported by individual year, location, CPA, and stalk position; with primings 1 and 2 represented in the lower stalk position, priming 3 ...