Which of the following is a natural insecticide?
Natural insecticide is neem, pyrethrum, biodegradable botanical pest control.
Ref: NCERT Geography — Natural Resources and Agriculture
#natural insecticide
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Natural insecticide produced by plants is:
Natural insecticidal compounds evolved as plant chemical defense against herbivory. Among most successful botanical insecticides, pyrethrin extracted from dried flower heads of Chrysanthemum cinerariifolium shows rapid knockdown, low mammalian toxicity with LD50 greater than 1 g per kg, and biodegradability within sunlight. Active esters partition into insect nervous system lipophilic phase, bind sodium channel and cause tremors, paralysis, and death. Unlike systemic carbamate toxins or mammalian neurotoxins, pyrethrin action is contact based and reversible at sublethal doses but enhanced by s
Ref: Isman Annu Rev Entomol 2006 botanical insecticides; NCBI NBK20389 pyrethrins; Casida Environ Health Perspect sodium channel; Campbell plant defense.
