TAMMY: Pyrethrum is a natural insecticide, made from plants in the now-obsolete genus of daisies that included chrysanthemums and tanacetum. The active chemicals in these plants are called pyrethrins ...

Q: Please recommend a ready to use houseplant spray containing insecticidal soap or pyrethrin that you suggested using to get patio plants ready to move indoors. I have several large geraniums, doing ...

IN my article published in NATURE of June 27 (p. 720) on “Biological Assay of Insecticidal Sprays”, it was stated that a solution of pyrocatechol in ether was recommended as a stabilizer for the ...