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The Toxicity, Persistence and Mode of Actions of Selected Botanical Pesticides in Africa against Insect Pests in Common Beans, P. vulgaris: A Review

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dc.contributor.author Mpumi, Nelson
dc.contributor.author Mtei, Kelvin M.
dc.contributor.author Machunda, Revocatus L.
dc.contributor.author Ndakidemi, Patrick A.
dc.date.accessioned 2019-05-22T08:09:52Z
dc.date.available 2019-05-22T08:09:52Z
dc.date.issued 2016-01-26
dc.identifier.uri http://dx.doi.org/10.4236/ajps.2016.71015
dc.identifier.uri http://dspace.nm-aist.ac.tz/handle/123456789/142
dc.description Research Article published by Scientific Research Publishing Inc. en_US
dc.description.abstract Common beans are affected by many insect pests such as bean leaf beetle, aphids, legume pod borer and bean beetles. Traditional and cultural practices such as site selection, crop rotation, intercropping and seed selection, sowing date are used to reduce the infestation of insect pests of common beans in the field and in storage rooms. Natural enemies such as predators, parasitoids and pathogens can control the insect pests. Synthetic pesticides such as cypermethion, carbaryl, and lambda-cyhalothrin have reported to be effective, but are toxic to people, destroy natural enemies and contaminate the environment. Botanical pesticides are the promising alternatives. This review paper explains toxicity, persistence and mode of actions of active ingredients of botanical pesticides. Rotenone from T. vogelii has the oral lethal dose (LD50) of 132 - 1500 mg/kg to mammals. It delays the electron transport chain in mitochondria of the insects and limits the cellular energy production. Azadirachtin is antifeedant and growth disruptor of insects. It has low toxicity to mammals. The oral LD50 in mammals is greater than 3540 mg/kg. Azadirachtin displays strong effects on chemoreceptors of the insects. Pyrethrins are axonic poisons and have repellent effects to insects. It is less toxic to mammals with the LD50 of about 1500 mg/Kg. It attacks the nervous systems of insects. Sesquiterpene lactones from T. diversifolia, Pentacyclic triterpenoids from Lantana camara, Vernodalin, Vernodalol and Epivernodalol from V. amygdalina have repellent and feeding deterrents chemicals which discourage the insects from feeding the crop. Most active ingredients of botanical pesticides have short life span in the environment. en_US
dc.language.iso en_US en_US
dc.publisher Scientific Research Publishing Inc. en_US
dc.subject Botanical Pesticides en_US
dc.subject Toxicity en_US
dc.subject Persistence en_US
dc.subject Mode of Actions en_US
dc.title The Toxicity, Persistence and Mode of Actions of Selected Botanical Pesticides in Africa against Insect Pests in Common Beans, P. vulgaris: A Review en_US
dc.type Article en_US


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