Sabadilla acts as a contact and stomach poison and has been effective against caterpillars, leaf hoppers, thrips, stink bugs and squash bugs. The insecticide is labeled for use on many vegetables. Pyrethrum Pyrethrum is the most widely used botanical insecticide in the United States. Most Insects are highly susceptible to pyrethrum at low concentrations. Flying Insects drop almost immediately upon exposure.
Pyrethrums are primarily effective as a contact poison.
They affect the central nervous system of Insects. Pyrethrum is nontoxic to most mammals, making it among the safest insecticides in use. Trade names include Pyrenone and Pyrellin. Do not use products containing PBO when temperatures exceed 90 degrees F. Pyrethroids Pyrethroids are synthetic materials designed to imitate natural pyrethrum. Pyrethroids are not accepted by organic producer regulations.