Granny's gone and done it again

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"Pyrethrins and pyrethroids. Pyrethrins are a group of insecticides derived from the pyrethrum flower (Chrysanthemum cinerariaefo- lium); synthetic forms based on the naturally occurring com- pounds are called pyrethroids (Blagburn & Lindsay, 2001). Pyrethrins and pyrethroids are among the least toxic of the insecticides and are not as well absorbed through skin as other insecticidal compounds (Al-Saleh, 1994). In general, pyrethrins and pyrethroids are effective against mites, fleas, flies, lice and ticks (Blagburn & Lindsay, 2001). In poultry, permethrin is the primary pyrethroid used to treat ectoparasite infections, and especially infestations of the northern fowl mite, which has...."

http://www.farad.org/publications/miscellaneous/LayingHensEggResidues.pdf
 

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