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Residues and half-life times of pyrethrins on peaches after field treatments.

The behavior of pyrethrins and piperonyl butoxide (PB) on peaches has been studied after field treatment. Three experiments were carried out at 1, 5, and 10x the concentration recommended by the manufacturer. In all experiments, the initial deposition was below the maximum residue level (MRL), and the half-life time calculated in the 10x experiment for total pyrethrins within 2.3 days was in agreement with the preharvest interval (PHI) recommended. In a model system, the photodegradation rates of the pyrethrins in three commercial products were compared with pyrethrum pale (PP), with and without the presence of peach waxes. The pyrethrins in formulations containing PB showed higher half-life times but were not influenced by the presence of waxes, whereas in the case of PP that does not contain any PB, photodegradation was significantly affected by the presence of waxes.[1]

References

  1. Residues and half-life times of pyrethrins on peaches after field treatments. Angioni, A., Dedola, F., Minelli, E.V., Barra, A., Cabras, P., Caboni, P. J. Agric. Food Chem. (2005) [Pubmed]
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