Persistency of larvicidal effects of plant oil extracts under different storage conditions

Amer, Abdelkrim; Mehlhorn, Heinz

doi:10.1007/s00436-006-0183-2

Cited by 132 publications

(25 citation statements)

References 6 publications

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“…The oil from Cinnamomum camphora, Boswellia carteri, Anethum graveolens and Myrtus communis showed 100% mortality at 50ppm within 3 hours against the 3 rd instar larvae of Aedes aegypti (Amer and Mehlhorn, 2006). In the present study Pseudocedrela kotschyi exhibited a moderate larvicidal activity against Culex quinquefasciatus (LD 50 =630.95mg/ml), and the percentage mortality for the highest concentration after 24 hours was 66.67%.…”

Section: Effect Of P Kotschyi Ethanolic Stem Bark Extract On Sitophisupporting

confidence: 43%

Studies on the Insecticidal Activities of Pseudocedrela kotschyi on Culex quinquefasciatus Larvae and the Maize Weevil (Sitophilus zeamais) Motschulsky

Dawet¹,

Yakubu²,

Meshach³

2017

Int.J.Curr.Res.Aca.Rev.

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Article InfoCulex quinquefasciatus is the vector that transmits the causative agent of filariasis which poses a great threat to the world at large. Storage pest are nuisance to farmers because they destroy farm products either in the store or in the farm. In this study, the insecticidal activity of Pseudocedrela kotschyi stem bark extract was tested against the fourth instar larvae of Culex quinquefasciatus and adult Sitophilus zeamais. A total of three hundred and sixty 4 th instar larvae of Culex quinquefasciatus were divided into six groups each consisting of three replicates containing twenty larvae each. Groups one to four were each administered one of the following dose: 1000mg, 250mg, 125mg and 62.5mg of the ethanolic stem bark extract of P. kotschyi. Group five was treated with a standard drug (permethrin 0.6%) and the last group was neither treated with the extract nor the standard drug. The highest concentration 1000mg of the plant extract had 98.33% mortality followed by 250mg which exhibited 61.67%, 125mg with 48.33% mortality and 62.5 with 25%. There was 100% mortality in the group treated with standard drug and no mortality in the control. Analysis of variance showed significant difference (p<0.05) in the mortality of larvae between the different extract levels.The mortality of the Sitophilus zeamais was observed for 7 daysafter exposure. The highest percentage mortality of 53.33% was recorded inthe weevils treated with 750mgof the plant extract followed by 1750mg which had 50% and the lowest concentration of 500mg plant extract had the lowest mortality of33.33%. However, there is no significant difference (p>0.05) between the mortality of the groups administered extract at different concentrations. From the result, it can be tentatively concluded here; based on this research that P. kotschyi can act as a bio-pesticide of plant origin which will be less toxic to man and other organisms.

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Section: Effect Of P Kotschyi Ethanolic Stem Bark Extract On Sitophisupporting

confidence: 43%

Studies on the Insecticidal Activities of Pseudocedrela kotschyi on Culex quinquefasciatus Larvae and the Maize Weevil (Sitophilus zeamais) Motschulsky

Dawet¹,

Yakubu²,

Meshach³

2017

Int.J.Curr.Res.Aca.Rev.

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“…The activity of crude plant extracts is often attributed to the complex mixture of active compounds. Natural pesticides derived from plants are a promising tool especially for targeting mosquitoes in the larval stage [6] , but there are some factors that need more investigation in order to extract useful conclusions: light and storing conditions [29] , enantioselectivity of major and minor ingredients [30] , harvesting time and plant material [12] , etc. Further studies are needed to identify the possible role of extract as adulticide, oviposition deterrent and ovicidal agent.…”

Section: Discussionmentioning

confidence: 99%

Larvicidal and irritant activities of hexane leaf extracts of Citrus sinensis against dengue vector Aedes aegypti L.

Warikoo

Ray²,

Sandhu³

et al. 2012

Asian Pacific Journal of Tropical Biomedicine

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“…Studies with Amyris essential oil as a potential mosquito larvicide were conducted using the yellow fever mosquito, (Aedes aegypti L.). With fresh preparations, researchers found 100% mortality of the mosquito larvae at 6 h following application, at a rate of 50 ppm (17). Efficacy following storage of this preparation showed that it was not effective after 1 week in a dark environment.…”

Section: Amyris Essential Oilmentioning

confidence: 99%

Amyris and Siam-wood Essential Oils: Insect Activity of Sesquiterpenes

Paluch¹,

Zhu

Coats³

2009

ACS Symposium Series

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Recent investigations on the sesquiterpene-rich Amyris (Amyris balsamifera L.) and Siam-wood (Fokienia hodginsii L.) essential oils revealed significant arthropod repellency and toxicity responses. Amyris essential oil and one of its major components, elemol, were evaluated in laboratory bioassays and identified as effective mosquito repellents, specifically characterized by high levels of contact and minimal spatial repellency. Mosquito responses to catnip (Nepeta cataria L.) essential oil are characterized with high spatial activity, but lack significant contact repellency. Sampling within the staticair bioassay chamber with solid-phase microextraction provided measurements of the relative concentration and distribution of volatiles. These results supported the differences observed in repellency between essential oil treatments. Essential oil mixtures containing both spatial (catnip) and contact (Amyris) repellents were made and showed high levels of residual control via both modes of action. Siam-wood essential oil scored high in both spatial and contact efficacy against mosquitoes. Observations during this study included signs of toxicity. Two of the primary components of Siam-wood essential oil were tested for 24-hour house fly (Musca domestica L.) topical mortality. Transnerolidol and fokienol were found to possess similar insecticidal activity (topical LD50 values ranged from 0.17-0.21 µmol/fly). Amyris essential oil was selected for additional testing with brown dog ticks (Rhipicephalus sanguineusLatreille) in a 'barrier' repellency assay. Individuals were observed repeatedly avoiding and moving away from surfaces treated with Amyris essential oil. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. Recent investigations on the sesquiterpene-rich Amyris (Amyris balsamifera L.) and Siam-wood (Fokienia hodginsii L.) essential oils revealed significant arthropod repellency and toxicity responses. Amyris essential oil and one of its major components, elemol, were evaluated in laboratory bioassays and identified as effective mosquito repellents, specifically characterized by high levels of contact and minimal spatial repellency. Mosquito responses to catnip (Nepeta cataria L.) essential oil are characterized with high spatial activity, but lack significant contact repellency. Sampling within the staticair bioassay chamber with solid-phase microextraction provided measurements of the relative concentration and distribution of volatiles.These results supported the differences observed in repellency between essential oil treatments. Essential oil mixtures containing both spatial (catnip) and contact (Amyris) repellents were made and showed high levels of residual control via both modes of action. Siam-wood essential oil scored high in both spatial and contact efficacy against mosquitoes. Observations during this study included signs of toxicity. Two of the primary components of Siam...

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Persistency of larvicidal effects of plant oil extracts under different storage conditions

Cited by 132 publications

References 6 publications

Studies on the Insecticidal Activities of Pseudocedrela kotschyi on Culex quinquefasciatus Larvae and the Maize Weevil (Sitophilus zeamais) Motschulsky

Studies on the Insecticidal Activities of Pseudocedrela kotschyi on Culex quinquefasciatus Larvae and the Maize Weevil (Sitophilus zeamais) Motschulsky

Larvicidal and irritant activities of hexane leaf extracts of Citrus sinensis against dengue vector Aedes aegypti L.

Amyris and Siam-wood Essential Oils: Insect Activity of Sesquiterpenes

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