The dissipation of lambda-cyhalothrin from cotton production systems

The dissipation of the pyrethroid, lambda-cyhalothrin [alpha-cyano-3-phenoxybenzyl-3-(2-chloro-3,3,3-trifluoroprop-1-enyl)-2,2-dimethyl cyclopropanecarboxylate] was studied in sterile buffer solution at two different pH values. It was observed that during the four week period, lambda-cyhalothrin was degraded in buffer solution at pH 9, with a half-life of 53 days, but not at pH 7. Isomerization of this compound was also observed at both pH values, but the rate was much greater at pH 9.