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- W2023200716 abstract "Abstract The bark of the Fagara heitzii tree in the west‐central African Republic of Congo (Congo–Brazzaville) is known anecdotally to provide protection for human residents against fleas and to be of use as a narcotic in fishing (similar to rotenone). We found that powder and hexane extracts from the bark of the Fagara heitzii tree contain insecticidal compounds. Dried powder (14.5 mg) on the bottom of a Petri dish is the residue at 14.494 mg per dish (LD 50 ) for 20 adult maize weevils Sitophilus zeamays after four days. The LD 50 of the same material to 20 adult cowpea weevils Callosobruchus maculatus was slightly higher at 16.144 mg/dish (after 48 h). These weevils cause significant economic damage to cowpea and maize in Congo–Brazzaville. Hexane extracts of the bark of Fagara heitzii were also toxic to these weevils. Symptoms of toxicity suggested the extracts were slow‐acting nerve poisons or respiratory inhibitors or both. The time needed to develop full toxicity suggested a respiratory poison. The hexane extract was also toxic to the American cockroach Periplaneta americana . The symptoms in the cockroach were similar, but cockroaches also exhibited apparent escape attempts suggesting they could detect the compounds. Signs of apparent irritation or exaggerated locomotion in all three insects also suggested irritation or nerve effects." @default.
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- W2023200716 date "2009-11-01" @default.
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- W2023200716 title "Extracts from the bark of<i>Fagara heitzii</i>(Aubr. et Pel.) (Rutaceae) tree are toxic to two weevils and the American cockroach" @default.
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- W2023200716 doi "https://doi.org/10.1111/j.1748-5967.2009.00245.x" @default.
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