IT is well known that both light and air rapidly destroy the pyrethrins, therefore to obtain a true picture of the relative persistence of pyrethrins and the gamma isomer of benzene hexachloride as a ...

A research team has elucidated the biosynthetic pathways of pyrethrum (Tanacetum cinerariifolium), identifying key genes responsible for pyrethrin production. These findings highlight pyrethrum's ...

IN reply to the queries raised by Mr. Beckley, I should like to record that the experiments described in my original letter were carried out merely to compare the toxicity and persistence of ...