Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast

Akpesse Akpa Alexandre Moise; Ochou Germain Elisabeth Cynthia; Diabate Dohouonan; Kedja Bossoma Agnes Monique; Koua Kouakou Herve

doi:doi:10.11648/j.aje.20220604.11

Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast

Akpesse Akpa Alexandre Moise, Ochou Germain Elisabeth Cynthia, Diabate Dohouonan, Kedja Bossoma Agnes Monique, Koua Kouakou Herve

Published in American Journal of Entomology (Volume 6, Issue 4)

Received: 13 September 2022 Accepted: 14 October 2022 Published: 18 October 2022

Views: Downloads:

Download PDF

Share This Article

Twitter
Linked In
Facebook

Abstract

The bug Pseudotheraptus devastans is one of main insect pests in Ivory Coast. The objective of this study was firstly to evaluate the incidence of Pseudotheraptus devastans attacks on coconut palm plants of two varieties (GOA and NJM), and secondly to study the insecticidal activity of essential oils (Ocimum gratissimum and Cymbopogon citratus) on adults of Pseudotheraptus devastans. Bunches of nuts aged 2 to 4 months showed the highest attack rate in the GOA variety. On other hand, all the nuts aged 1 to 7 months were all attacked in the NJM variety. As for the drop rates, bunches aged 1 to 4 months recorded the highest drop rates for both varieties. It appears that the NJM variety is more sensitive to bites unlike that of GOA which was more tolerant. Mortality rates varied with applied concentrations and observation time. Thus, the essential oils extracted from the two aromatic plants Ocimum gratissimum and Cymbopogon citratus have insecticidal properties on the adults of Pseudotheraptus devastans. This insecticidal effect was highlighted by the LC50, therefore determining the essential oil of Ocimum gratissimum as the most toxic with an LC50 of 1.41% unlike Cymbopognon citratus which recorded a value of 7.76%. These biopesticides can be used to protect coconut palms against insect pests.

Published in	American Journal of Entomology (Volume 6, Issue 4)
DOI	10.11648/j.aje.20220604.11
Page(s)	94-101
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2022. Published by Science Publishing Group

Keywords

Cocos nucifera, Bug Attacks, Fall Rate, Biopesticides

References

[1]	B. F. Gunn, L. Baudouin, et K. M. Olsen, «Independent origins of cultivated coconut (Cocos nucifera L.) in the old world tropics», Plos One, vol. 6, n^o 6, p. e21143, 2011, doi: doi.org/10.1371/journal.pone.0021143.
[2]	N. I. Beugré et al., «Inventaire de l’entomofaune de cocoteraies infectées par la maladie du jaunissement mortel du cocotier de trois villages du département de Grand-Lahou (Adjadon, Badadon et Yaokro) en Côte d’Ivoire», Int. J. Biol. Chem. Sci., vol. 12, n^o 5, p. 2266-2283, 2018, doi: doi.org/10.4314/ijbcs.v12i5.27.
[3]	V. J. Isaac, R. V. E. Santo, B. Bentes, F. L. Frédou, K. R. M. Mourão, et T. Frédou, «An interdisciplinary evaluation of fishery production systems off the state of Pará in North Brazil», J. Appl. Ichthyol., vol. 25, n^o 3, p. 244-255, 2009, doi: doi.org/10.1111/j.1439-0426.2009.01274.x.
[4]	A. Mubarack Ali, «A study on coconut production and marketing in tamil nadu with special reference to Pollatchi south block», Doctor of Philosophy in Economics, Bharathidasan University, India, 2017.
[5]	J. L. Konan, K. Allou, A. N’goran, L. Diarrasouba, et K. Ballo, « Bien cultiver le cocotier en Côte d’Ivoire », Dir. Programme Rech. L’appui Au Dév. Fiche Tech. Sur Cocotier, p. 4, 2006.
[6]	J. L. Konan et al., «First report on the molecular identification of the phytoplasma associated with a lethal yellowing-type disease of coconut palms in Côte d’Ivoire», New Dis. Rep., vol. 28, n^o 3, 2013.
[7]	R. R. Assa, J.-L. Konan, J. Nemlin, A. Prades, N. Agbo, et R. S. Sié, «Diagnostic de la cocoteraie paysanne du littoral ivoirien», Sci. Nat. Sér. Biosci. Agron. Environ. Biotechnol., 2006.
[8]	Y. Arocha-Rosete, J. L. Konan Konan, A. H. Diallo, K. Allou, et J. A. Scott, «Identification and molecular characterization of the phytoplasma associated with a lethal yellowing-type disease of coconut in Côte d’Ivoire», Can. J. Plant Pathol., vol. 36, n^o 2, p. 141-150, 2014, doi: doi.org/10.1080/07060661.2014.899275.
[9]	J. L. Konan, «Status of coconut genetic resources research in Côte d’Ivoire», in Coconut Genetic Resources, Pons Batugal, V. Ramanatha Rao and Jeffrey Oliver, Editors., 2005, p. 654-660.
[10]	K. S. B. N’Goran, A. F. Kouassi, G. J. Seu, G. E. C. Ochou, K. Allou, et S. Aké, «In vivo expression and evolution of Phytophthora katsurae (Pythiaceae) symptoms on two coconut varieties EGD and PB 121+ after treatment with phosphorous acid in Southern Côte d’Ivoire», Int. J. Sci., vol. 9, n^o 10, p. 31-44, 2020, doi: doi.org/10.18483/ijSci.2371.
[11]	T. L. Sharp et M. Busse, «Cash crops and markets», in The Melanesian World, Routledge, 2019, p. 194-222.
[12]	J.-F. Julia et D. Mariau, «La punaise du cocotier: Pseudotheraptus sp. en Côte-d’Ivoire. I. Etudes préalables à la mise au point d’une méthode de lutte intégrée», Oléagineux, vol. 33, n^o 2, p. 65-75, 1978.
[13]	K. Allou, M. Doumbia, et A. H. Diallo, «Influence de trois facteurs sur le peuplement d’oecophylles dans la lutte biologique contre la punaise du cocotier en basse Côte d’Ivoire», Agron. Afr., vol. 18, n^o 1, p. 33-40, 2006.
[14]	B. Boher, J.-F. Daniel, G. Fabres, et G. Bani, «Action de Pseudotheraptus devastans (Distant) (Het. Coreidae) et de Colletotrichum gloeosporioides Penz. dans le développement de chancres et la chute des feuilles chez le manioc (Manihot esculenta Crantz) (1)», Agronomie, vol. 3, n^o 10, p. 989-994, 1983.
[15]	D. Mariau, R. Desmier De Chenon, J.-F. Julia, et R. Philippe, «Les ravageurs du palmier à huile et du cocotier en Afrique occidentale», 1981.
[16]	F. Doh, K. Yoboue, B. E. Z. Koffi, A. E. Issali, K. Allou, et M. Dagnogo, «Biological Cycle of Bug Pseudotheraptus devastans Distant (Heteroptera: Coreidae), the Coconut Pest in Côte d’Ivoire», Adv. Entomol., vol. 4, n^o 1, p. 19-24, 2015, doi: doi.org/10.4236/ae.2016.41003.
[17]	V. M. Medina-Urrutia, J. E. Reyes-Hernández, G. Virgen-Calleros, E. Pimienta-Barrios, et M. M. Robles-González, «Organic mango production: a review Campo Experimental Tecomán, Mexico», in Achieving sustainable cultivation of mangoes, 1rst edition., Burleigh Dodds Science Publishing, 2018, p. 249-288.
[18]	F. Doh, M. D. S. Yao, et A. E. Issali, «Incidence des attaques de la punaise Pseudotheraptus devastans (Distant) (Heteroptera: coreidae) sur trois varietes hybrides de cocotier, PB 113+, PB 121+ ET NVS x GVT en Côte D’Ivoire», Int. J. Biol. Chem. Sci., vol. 8, n^o 6, p. 2650-2658, 2014, doi: doi.org/10.4314/ijbcs.v8i6.25.
[19]	M. Scheringer, S. Strempel, S. Hukari, C. A. Ng, M. Blepp, et K. Hungerbuhler, «How many persistent organic pollutants should we expect?», Atmospheric Pollut. Res., vol. 3, n^o 4, p. 383-391, 2012, doi: doi.org/10.5094/APR.2012.044.
[20]	K. Vorkamp, F. F. Rigét, R. Bossi, C. Sonne, et R. Dietz, «Endosulfan, short-chain chlorinated paraffins (SCCPs) and octachlorostyrene in wildlife from Greenland: levels, trends and methodological challenges», Arch. Environ. Contam. Toxicol., vol. 73, n^o 4, p. 542-551, 2017, doi: doi.org/10.1007/s00244-017-0428-3.
[21]	E. A. Dwomoh, J. V. Afun, J. B. Ackonor, et V. N. Agene, «Investigations on Oecophylla longinoda (Latreille) (Hymenoptera: Formicidae) as a biocontrol agent in the protection of cashew plantations», Pest Manag. Sci. Former. Pestic. Sci., vol. 65, n^o 1, p. 41-46, 2009, doi: doi.org/10.1002/ps.1642.
[22]	T. Rajagopal, P. Singam, S. Kulandaivel, S. Selvarani, S. Sevarkodiyone, et P. Ponmanickam, «Survey of red weaver ants (Oecophylla smaragdina) and their host plants in urban and rural habitats of Madurai District, Tamil Nadu, India», J. Entomol. Zool. Stud., vol. 7, n^o 1, p. 938-943, 2019.
[23]	N. A. Nadio et al., « Propriétés insecticides et répulsives de l’huile essentielle d’Ocimum sanctum L. envers Dysdercus voelkeri Schmidt (Heteroptera; Pyrrhocoridae)», Sci. Vie Terre Agron., vol. 3, n^o 2, p. 65-75, 2016.
[24]	E.-B. Z. Koffi, S. D. M. Yao, F. Doh, Y. Koffi, R. S. Sié, et K. J. L. Konan, «Évaluation de la tolérance des descendances hybrides de cocotier (Cocos nucifera L.) NJM x GVT vis-à-vis des attaques de la punaise Pseudotheraptus devastans Distant (Heteroptera: Coreidae) en Côte d’Ivoire», Afr. Sci., vol. 13, n^o 3, p. 364-376, 2017.
[25]	R. R. Assa, J. K. Konan, A. Prades, J. Nemlin, et E. Koffi, «Physicochemical characteristics of kernel during fruit maturation of four coconut cultivars (Cocos nucifera L.)», Afr. J. Biotechnol., vol. 9, n^o 14, p. 2136-2144, 2010.
[26]	Y. N. Lucie, S. Senan, et T. B. C. Sylvain, «Heteroptera Coreidae (Anoplocnemis curvipes, Homoeocerus pallens, Leptoglossus membranaceus et Pseudotheraptus devastans): Four crop pest and their wild host plants», Am. Res. J. Agric., vol. 1, n^o 4, p. 4-11, 2015.
[27]	L. Diamé, J.-Y. Rey, J.-F. Vayssières, I. Grechi, A. Chailleux, et K. Diarra, «Ants: Major functional elements in fruit agro-ecosystems and biological control agents», Sustainability, vol. 10, n^o 1, p. 1-18, 2017, doi: 10.3390/su10010023.
[28]	F. Tchoumbougnang et al., «Activité larvicide sur Anopheles gambiae Giles et composition chimique des huiles essentielles extraites de quatre plantes cultivées au Cameroun», Biotechnol. Agron. Soc. Environ., vol. 13, n^o 1, p. 77-84, 2009.
[29]	K. C. Kobenan et al., «Comparaison du potentiel insecticide des huiles essentielles de Ocimum gratissimum L. et de Ocimum canum Sims sur Pectinophora gossypiella Saunders (Lepidoptera: Gelechiidae), insecte ravageur du cotonnier en Côte d’Ivoire», Eur. Sci. J., vol. 14, n^o 21, p. 236-301, 2018, doi: doi.org/10.19044/esj.2018.v14n21p286.
[30]	K. C. Kobenan et al., «Chemical Composition and Spectrum of Insecticidal Activity of the Essential Oils of Ocimum gratissimum L. and Cymbopogon citratus Stapf on the Main Insects of the Cotton Entomofauna in Côte d’Ivoire», Chem. Biodivers., vol. 18, n^o 11, p. e2100497, 2021.
[31]	R. A. Cloyd et H. Chiasson, «Activity of an essential oil derived from Chenopodium ambrosioides on greenhouse insect pests», J. Econ. Entomol., vol. 100, n^o 2, p. 459-466, 2014, doi: doi.org/10.1093/jee/100.2.459.
[32]	A. Gonzalez-Coloma, M. Reina, C. E. Diaz, B. M. Fraga, et O. Santana-Meridas, «Natural product-based biopesticides for insect control», Elsevier Ref. Module Chem. Mol. Sci. Chem. Eng., 2013, doi: doi.org/10.1016/B978-0-12-409547-2.02770-0.
[33]	C. M. Priestley, E. M. Williamson, K. A. Wafford, et D. B. Sattelle, «Thymol, a constituent of thyme essential oil, is a positive allosteric modulator of human GABA receptors and a homo-oligomeric GABA receptor from Drosophila melanogaster», Br. J. Pharmacol., vol. 140, n^o 8, p. 1363-1372, 2003.

Cite This Article

Plain Text BibTeX RIS

APA Style

Akpesse Akpa Alexandre Moise, Ochou Germain Elisabeth Cynthia, Diabate Dohouonan, Kedja Bossoma Agnes Monique, Koua Kouakou Herve. (2022). Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast. American Journal of Entomology, 6(4), 94-101. https://doi.org/10.11648/j.aje.20220604.11

Copy | Download

ACS Style

Akpesse Akpa Alexandre Moise; Ochou Germain Elisabeth Cynthia; Diabate Dohouonan; Kedja Bossoma Agnes Monique; Koua Kouakou Herve. Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast. Am. J. Entomol. 2022, 6(4), 94-101. doi: 10.11648/j.aje.20220604.11

Copy | Download

AMA Style

Akpesse Akpa Alexandre Moise, Ochou Germain Elisabeth Cynthia, Diabate Dohouonan, Kedja Bossoma Agnes Monique, Koua Kouakou Herve. Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast. Am J Entomol. 2022;6(4):94-101. doi: 10.11648/j.aje.20220604.11

Copy | Download

@article{10.11648/j.aje.20220604.11,
  author = {Akpesse Akpa Alexandre Moise and Ochou Germain Elisabeth Cynthia and Diabate Dohouonan and Kedja Bossoma Agnes Monique and Koua Kouakou Herve},
  title = {Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast},
  journal = {American Journal of Entomology},
  volume = {6},
  number = {4},
  pages = {94-101},
  doi = {10.11648/j.aje.20220604.11},
  url = {https://doi.org/10.11648/j.aje.20220604.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.aje.20220604.11},
  abstract = {The bug Pseudotheraptus devastans is one of main insect pests in Ivory Coast. The objective of this study was firstly to evaluate the incidence of Pseudotheraptus devastans attacks on coconut palm plants of two varieties (GOA and NJM), and secondly to study the insecticidal activity of essential oils (Ocimum gratissimum and Cymbopogon citratus) on adults of Pseudotheraptus devastans. Bunches of nuts aged 2 to 4 months showed the highest attack rate in the GOA variety. On other hand, all the nuts aged 1 to 7 months were all attacked in the NJM variety. As for the drop rates, bunches aged 1 to 4 months recorded the highest drop rates for both varieties. It appears that the NJM variety is more sensitive to bites unlike that of GOA which was more tolerant. Mortality rates varied with applied concentrations and observation time. Thus, the essential oils extracted from the two aromatic plants Ocimum gratissimum and Cymbopogon citratus have insecticidal properties on the adults of Pseudotheraptus devastans. This insecticidal effect was highlighted by the LC50, therefore determining the essential oil of Ocimum gratissimum as the most toxic with an LC50 of 1.41% unlike Cymbopognon citratus which recorded a value of 7.76%. These biopesticides can be used to protect coconut palms against insect pests.},
 year = {2022}
}

Copy | Download

TY  - JOUR
T1  - Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast
AU  - Akpesse Akpa Alexandre Moise
AU  - Ochou Germain Elisabeth Cynthia
AU  - Diabate Dohouonan
AU  - Kedja Bossoma Agnes Monique
AU  - Koua Kouakou Herve
Y1  - 2022/10/18
PY  - 2022
N1  - https://doi.org/10.11648/j.aje.20220604.11
DO  - 10.11648/j.aje.20220604.11
T2  - American Journal of Entomology
JF  - American Journal of Entomology
JO  - American Journal of Entomology
SP  - 94
EP  - 101
PB  - Science Publishing Group
SN  - 2640-0537
UR  - https://doi.org/10.11648/j.aje.20220604.11
AB  - The bug Pseudotheraptus devastans is one of main insect pests in Ivory Coast. The objective of this study was firstly to evaluate the incidence of Pseudotheraptus devastans attacks on coconut palm plants of two varieties (GOA and NJM), and secondly to study the insecticidal activity of essential oils (Ocimum gratissimum and Cymbopogon citratus) on adults of Pseudotheraptus devastans. Bunches of nuts aged 2 to 4 months showed the highest attack rate in the GOA variety. On other hand, all the nuts aged 1 to 7 months were all attacked in the NJM variety. As for the drop rates, bunches aged 1 to 4 months recorded the highest drop rates for both varieties. It appears that the NJM variety is more sensitive to bites unlike that of GOA which was more tolerant. Mortality rates varied with applied concentrations and observation time. Thus, the essential oils extracted from the two aromatic plants Ocimum gratissimum and Cymbopogon citratus have insecticidal properties on the adults of Pseudotheraptus devastans. This insecticidal effect was highlighted by the LC50, therefore determining the essential oil of Ocimum gratissimum as the most toxic with an LC50 of 1.41% unlike Cymbopognon citratus which recorded a value of 7.76%. These biopesticides can be used to protect coconut palms against insect pests.
VL  - 6
IS  - 4
ER  -

Copy | Download

Author Information

Akpesse Akpa Alexandre Moise

Formation Unit and Research Biosciences, Felix Houphouet Boigny University, Abidjan, Ivory Coast
Ochou Germain Elisabeth Cynthia

Entomology Laboratory, Marc Delorme Research Station, National Center for Agricultural Research, Abidjan, Ivory Coast
Diabate Dohouonan

Formation Unit and Research Forestry and Environmental Engineering, University of Man, Man, Ivory Coast
Kedja Bossoma Agnes Monique

Formation Unit and Research Biosciences, Felix Houphouet Boigny University, Abidjan, Ivory Coast
Koua Kouakou Herve

Formation Unit and Research Biosciences, Felix Houphouet Boigny University, Abidjan, Ivory Coast

Download PDF

Sections

Plain Text BibTeX RIS

APA Style

Akpesse Akpa Alexandre Moise, Ochou Germain Elisabeth Cynthia, Diabate Dohouonan, Kedja Bossoma Agnes Monique, Koua Kouakou Herve. (2022). Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast. American Journal of Entomology, 6(4), 94-101. https://doi.org/10.11648/j.aje.20220604.11

Copy | Download

ACS Style

Akpesse Akpa Alexandre Moise; Ochou Germain Elisabeth Cynthia; Diabate Dohouonan; Kedja Bossoma Agnes Monique; Koua Kouakou Herve. Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast. Am. J. Entomol. 2022, 6(4), 94-101. doi: 10.11648/j.aje.20220604.11

Copy | Download

AMA Style

Akpesse Akpa Alexandre Moise, Ochou Germain Elisabeth Cynthia, Diabate Dohouonan, Kedja Bossoma Agnes Monique, Koua Kouakou Herve. Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast. Am J Entomol. 2022;6(4):94-101. doi: 10.11648/j.aje.20220604.11

Copy | Download

@article{10.11648/j.aje.20220604.11,
  author = {Akpesse Akpa Alexandre Moise and Ochou Germain Elisabeth Cynthia and Diabate Dohouonan and Kedja Bossoma Agnes Monique and Koua Kouakou Herve},
  title = {Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast},
  journal = {American Journal of Entomology},
  volume = {6},
  number = {4},
  pages = {94-101},
  doi = {10.11648/j.aje.20220604.11},
  url = {https://doi.org/10.11648/j.aje.20220604.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.aje.20220604.11},
  abstract = {The bug Pseudotheraptus devastans is one of main insect pests in Ivory Coast. The objective of this study was firstly to evaluate the incidence of Pseudotheraptus devastans attacks on coconut palm plants of two varieties (GOA and NJM), and secondly to study the insecticidal activity of essential oils (Ocimum gratissimum and Cymbopogon citratus) on adults of Pseudotheraptus devastans. Bunches of nuts aged 2 to 4 months showed the highest attack rate in the GOA variety. On other hand, all the nuts aged 1 to 7 months were all attacked in the NJM variety. As for the drop rates, bunches aged 1 to 4 months recorded the highest drop rates for both varieties. It appears that the NJM variety is more sensitive to bites unlike that of GOA which was more tolerant. Mortality rates varied with applied concentrations and observation time. Thus, the essential oils extracted from the two aromatic plants Ocimum gratissimum and Cymbopogon citratus have insecticidal properties on the adults of Pseudotheraptus devastans. This insecticidal effect was highlighted by the LC50, therefore determining the essential oil of Ocimum gratissimum as the most toxic with an LC50 of 1.41% unlike Cymbopognon citratus which recorded a value of 7.76%. These biopesticides can be used to protect coconut palms against insect pests.},
 year = {2022}
}

Copy | Download

TY  - JOUR
T1  - Essentials Oils (Ocimum gratissimum and Cymbopogon citratus) Against Pseudotheraptus devastans in Coconut Plantations at Marc-Delorme Station in Ivory Coast
AU  - Akpesse Akpa Alexandre Moise
AU  - Ochou Germain Elisabeth Cynthia
AU  - Diabate Dohouonan
AU  - Kedja Bossoma Agnes Monique
AU  - Koua Kouakou Herve
Y1  - 2022/10/18
PY  - 2022
N1  - https://doi.org/10.11648/j.aje.20220604.11
DO  - 10.11648/j.aje.20220604.11
T2  - American Journal of Entomology
JF  - American Journal of Entomology
JO  - American Journal of Entomology
SP  - 94
EP  - 101
PB  - Science Publishing Group
SN  - 2640-0537
UR  - https://doi.org/10.11648/j.aje.20220604.11
AB  - The bug Pseudotheraptus devastans is one of main insect pests in Ivory Coast. The objective of this study was firstly to evaluate the incidence of Pseudotheraptus devastans attacks on coconut palm plants of two varieties (GOA and NJM), and secondly to study the insecticidal activity of essential oils (Ocimum gratissimum and Cymbopogon citratus) on adults of Pseudotheraptus devastans. Bunches of nuts aged 2 to 4 months showed the highest attack rate in the GOA variety. On other hand, all the nuts aged 1 to 7 months were all attacked in the NJM variety. As for the drop rates, bunches aged 1 to 4 months recorded the highest drop rates for both varieties. It appears that the NJM variety is more sensitive to bites unlike that of GOA which was more tolerant. Mortality rates varied with applied concentrations and observation time. Thus, the essential oils extracted from the two aromatic plants Ocimum gratissimum and Cymbopogon citratus have insecticidal properties on the adults of Pseudotheraptus devastans. This insecticidal effect was highlighted by the LC50, therefore determining the essential oil of Ocimum gratissimum as the most toxic with an LC50 of 1.41% unlike Cymbopognon citratus which recorded a value of 7.76%. These biopesticides can be used to protect coconut palms against insect pests.
VL  - 6
IS  - 4
ER  -

Copy | Download