Pyrethrins are refined from which natural source?

Pyrethrins are derived from chrysanthemum flowers, specifically from the species Chrysanthemum cinerariifolium and Chrysanthemum coccineum. These natural insecticides have been used for generations due to their effectiveness in pest control and their relatively low toxicity to humans and animals. The active compounds in pyrethrins work by disrupting the nervous system of insects, leading to paralysis and death.

While other options like pine trees, citrus fruits, and lavender are associated with various natural products, they do not yield pyrethrins. Pine trees might provide compounds used in other pest control strategies, citrus fruits offer essential oils that can repel some pests, and lavender is often used for its fragrance and insect-repelling properties, but none generate pyrethrins as a byproduct. Understanding the source of pyrethrins emphasizes the importance of using natural, plant-derived substances in integrated pest management strategies for effective and environmentally conscious pest control.