Pyrethrins are botanical insecticides derived from the extract of chrysanthemum flowers (pyrethrum flowers). On the other hand, pyrethroids are synthetic (human-made) derivatives of natural pyrethrins. Their chemical structures are mostly adapted from the chemical structures of the pyrethrins and act in a similar manner to pyrethrins. Pyrethroids are modified to increase their pesticidal activity as well as their resistance to sunlight and and other environmental factors.
Pyrethrins and pyrethroids are currently popular pesticides for household and agricultural pests because of their relatively low and reversible toxicity to humans in addition to a desirable environmental safety profile; they break down . . .
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