Pesticides are substances or organisms that prevent, destroy, repel or mitigate a pest.
Sabadilla is considered among the least toxic of botanical insecticides. It can irritate eyes and produce sneezing if inhaled. Pyrethrum is the most widely used botanical insecticide in the United States. Pyrethroids are synthetic materials designed to imitate natural pyrethrum. They have the same basic chemistry but are modified to improve persistence, insecticidal activity, etc.