Decay of parathion residues on field-treated tobacco, South Carolina--1972 (II)
Keil, J.E.; Loadholt, C.B.; Sandifer, S.H.; Sitterly, W.R.; Brown, B.L.
Pesticides Monitoring Journal 6(4): 377-378
1973
ISSN/ISBN: 0031-6156 PMID: 4721461 Document Number: 59973
In order to confirm the results of a study in South Carolina in 1971 on the length of time required for parathion to be degraded to 'zero' levels after application to tobacco, further studies were carried out there in 1972. Parathion and endosulfan were applied at rates of 0.375 and 0.125 lb active ingredient/acre, respectively (these being the rates used in the earlier study and not 1.5 and 0.5 lb/acre, respectively, as stated in the authors' previous paper [loc. cit.]). Endosulfan residues were not measured, but tobacco from the plots treated with endosulfan was analysed to determine whether there was measureable drift between plots. After each of the two parathion applications, the compound was degraded to 'zero' levels in five days. During the experiment, rainfall was slight and the daily temperatures averaged 76 deg F.