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 ...

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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 ...

In a letter to PointBlank last year, "depressed workers" painted a grim picture of the Pyrethrum Board of Kenya (PBK), alleging mismanagement and expressing fear that an impending retrenchment would ...

THE insecticidal properties of the flowers of certain species of pyrethrum (Chrysanthemum) have been known for a long period, the very high toxicity of the active principles to insects and their ...