> Stan has dealt with question of the the real-world half life in water. but again, I would question the presentation of any one number as being particularly meaningful.
> the soil study done for that registration on PEI showed a half life up to 455 days. ... The 455 days is a real figure.
I would like to see the context of this. I can not find any confirmation of the 455 number. I did find this:
> The halflife of imidacloprid in soil is 48–190 days depending upon the amount of ground cover, manure in soil and of course the sunlight.
> Gonzalez (2004) studied dissipation of abamectin, spinosad, imidacloprid and thiacloprid on horticultural crops following FAO guidelines and local good agricultural practices and reported negligible residues in all instances. Further it was also revealed that non-detection residue level reached within about 30 days after the last spray.
Persistence of Imidacloprid on Grape Leaves, Grape Berries and Soil
Bull Environ Contam Toxicol (2009) 82:239–242
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