Herbal Insecticides

Herbal insecticides are mainly used to control pests that infest cultivated plants and crops or to eliminate disease- carrying insects in specific areas. Herbal insecticides are natural, such as Karanjin, Annonin, Rotenone, Pyrethrins, and . Insecticides may affect the nervous system, inhibit essential enzymes, or prevent larvae from maturing (e.g., juvenile hormone). Insecticides are classified according to type of action as stomach poisons, contact poisons, residual poisons, systemic poisons, fumigants, repellents, attractants, insect growth regulators, or pheromones. Many act in more than one way. Stomach poisons are applied to plants so that they will be ingested as insects chew the leaves.