Tob. Reporter, 1994, 121-2, p. 64-7. Tob. Sci, 1994, 38, p. 14-7, ISSN.0361-5693

Residues of flumetralin on green and flue-cured tobacco

Philip Morris USA, Research Center, Richmond, VA, USA

Studies were conducted to determine residue levels of flumetralin on green tobacco, Nicotiana tabacum L., and to see what effects flue-curing had on residue levels. Immediately after application of flumetralin at 1.35 kg/ha, average residues on green leaves of flue-cured tobacco from the upper stalk position varied from 41.5 ppm at Whiteville, N.C. in 1984 to 117.7 ppm at Reidsville, N.C. in 1985. Residues of flumetralin on green lamina from the upper stalk position were much higher immediately after application than they were on lower stalk samples taken at the same time. The average losses after 4 days for the 1.35 kg/ha application rate were 99.6% for upper stalk leaves and 93.2% for lower stalk leaves. Additional losses occurred during curing. The highest residue levels of flumetralin were found on lower leaves and the lowest amounts were found on middle and upper stalk leaves.