The use of plants extracts in the improvement of cowpea yield | IJAAR 2021

The use of plants extracts in the improvement of cowpea yield | IJAAR 2021

By: Mr. Kapeuhag Latchikou Casimir, Barry Borkeum Raoul, Wini Goudoungou Jean, Dabolé Massah Odette, Ngakou Albert, and Mr. Nukenine Elias Nchiwan


In the substitution of chemical insecticides with potential biopesticides, the efficiency of Lippia multiflora, Plectranthus glandulosus and Callistemon rigidus were evaluated on the improvement of cowpea (Vinia unguiculata) in Dang (Ngaoundere, Cameroon). The experiment was conducted in a completely randomized block design with 5 treatments repeated 4 times each: the negative control, the positive control (Decis), L. multiflora, P. glandulosus and C. rigidus. These different insecticides were sprayed on cowpea plants with 14 days interval starting from the 14th day after sowing. The parameters collected were the diversity of insect pests, the number of pods, and the dry weight of the grains. All of the insecticides used improved cowpea yields. Although less efficient than Decis, most biopesticides significantly (p < 0.001) improved the yield of cowpeas compared to the negative control. This improvement was 260% for C. rigidus, and 120% for P. glandulosus. These results suggest that C. rigidus, P. glandulosus and L. multiflora could be considered as potential substitutes for chemical insecticides in improving cowpea yields.

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Agriculture in sub-Saharan Africa is essential to reduce poverty and strengthen food security (FAO, 2009a). Vigna unguiculata which occupies an important place in the Sudano-Sahelian and Guinean zones (Isubikalu et al., 2000) would therefore be a major asset, not only for food balance, but also for economic development (Adeoti et al., 2002). Indeed, this leguminous plant is cultivated for its richness in food proteins (20-25%) (Bressani, 1985; Rivas-Vega et al., 2006), but its production is rather low (MINADER, 2012). More than 80% of this low production is due to insect pests (Tamò et al., 1993), and the use of chemical pesticides has often caused more problems than it has solved (Bambara and Tiemtoré, 2008). In the development of healthier control strategies to increase the productivity of cowpea, plants extracts or botanicals could be used to substitute chemical insecticides (Barry et al., 2017). This is the case of Lippia multiflora, which efficiency has been demonstrated on Sitophilus zeamais (Nukenine et al., 2007), Callistemon rigidus which has been found to be efficient against Aedes aegypti and Anopheles gambiae larvae (Danga et al., 2014b), as well as Plectranthus glandulosus which has been shown to be efficient against Sitophilus oryzae, Sitophilus zeamais and Prostephanus truncatus (Ngamo et al., 2007a; Nukenine et al., 20010a). Therefore, the aim of this work was to further research on other plants (Lippia multiflora, Plectranthus glandulosus and Callistemon rigidus), which extracts could be of potential use as biopesticides against cowpea pests, so as to improve the yield. Get the full articles by following the link The use of plants extracts in the improvement of cowpea yield at dang (Ngaoundere, Cameroon)

Journal Name: International Journal of Agronomy and Agricultural Research | IJAAR


Adéoti R, Coulibaly O, Tamò M. 2002. Facteurs affectant l’adoption des nouvelles technologies du niébé Vigna unguiculata en Afrique de l’Ouest. Bulletin de la Recherche Agronomique du Bénin 36, 18p.

Bambara D, Tiemtoré J. 2008. Efficacité biopesticide de Hyptis spicigera Lam., Azadirachta indica A. Juss. et Euphorbia balsamifera Ait. sur le niébé Vigna unguculata L. Walp. Tropicultura 26, 53-55.

Barry BR, Ngakou A, Nukenine EN. 2017. Pesticidal Activity of Plant Extracts and a Mycoinsecticide (Metarhrizium anisopliae) on Cowpea flower Thrips and Leaves Damages in the Field. Journal of Experimental Agriculture International 18(2), 1-15, 2017.

Barry BR, Ngakou A, Tamò M, Nukenine EN. 2019. The incidence of aqueous neem leaves (Azadirachta indica A. Juss) extract and Metarhizium anisopliae Metch. on cowpea thrips (Megolurothips sjostedti Trybom) and yield in Ngaoundéré (Adamaoua, Cameroun). Journal of Entomology and Zoology Studies 7(5), 333-338.

Barry BR. 2018. Impact d’extraits de plantes et d’un mycoinsecticide sur la population de thrips et le rendement du niébé à Ngaoundéré et à Maroua (Cameroun). Thèse de Doctorat/PhD, Université de Ngaoundéré 155p.

Bressani R. 1985. Nutritive value of cowpea. In: Cowpea Reseach, Production and Utilization. Singh S. R., Rachel K. O. (Eds). Wiley and Sons, Chester, UK pp. 353-360.

Danga YSP, Esimone CO, Younoussa L, Nukenine EN. 2014b. Larvicidal and pupicidal activities of Plectranthus glandulosus and Callistemon rigidus leaf essential oils against three mosquito species. J. Mosq. Res 4, 5-14.

Dugje IY, Omoigui LO, Ekeleme F, Kamara AY, Ajeigbe H. 2009. Production du niébé en Afrique de l’Ouest. Guide du Paysan IITA 26p.

Ibrahim L, Butt T, Beckett A, Clark SJ. 1999. The germination oil-formulated conidia of the insect pathogen Metarhizium anisopliae. Mycol. Res 103, 901-907.

Isubikalu P, Erbaugh JM, Semana AR, Adipala E. 2000. The influence of farmer perceptionon pesticide usage for management of cowpea field pest in eastern Uganda.Africa Crop Science Journal 8, 317-325.

Mehinto JT, Atachi P, Elégbédé M, Kpindou OKD, Tamò M. 2014. Efficacité comparée des insecticides de natures différentes dans la gestion des insectes ravageurs du niébé au Centre du Bénin. Journal of Applied Biosciences 84, 7695- 7706.

Minader / Desa. 2012. Annuaire des Statistiques du secteur Agricole, Campagnes 2009 & 2010. Direction des Enquêtes et des Statistiques Agricoles. AGRI-STAT N° 17, 123 p.

Ngamo TSL, Ngassoum MB, Mapongmestsem PM, Noudjou WF. 2007a. Use of Essential Oilsof Plants as Protectant of Grains during Storage. Agricultural Journal 2(2), 204-209.

Nukenine EN, Adler C, Reichmuth C. 2007. Efficacy evaluation of plant powders from. Cameroon as post-harvest grain protectants against the infestation of Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae). Journal of Plant Disease and Protection 114(1), 30-36.

Nukenine EN, Adler C, Reichmuth C. 2010a. Bioactivity of fenchone and Plectranthus glandulosus oil against Prostephanus truncatus and two strains of Sitophilus zeamais. J. Appl. Ent 134, 132-141.

Praveenkg, Renuka J, Shweta J, Archana S. 2012. A Review on biological and investigation of plant genus Callistemon. Asian Pac J. Trop. Biomed (2012): S1906-S1909.

Sreekanth. 2013. Field evaluation of certain leaf extracts for the control of mussel scale (Lepidosaphes piperis Gr.) in Black pepper (Piper nigrum L.). Journal of Biopesticides 6(1), 1-15.

Tamò M, Baumgärtner J, Gutierrez AP. 1993. Analysis of cowpea monocropping system in West Africa. II. Modelling the interaction between cowpea and the bean flower thrips Megalurothrips sjostedti (Trybom) Thysanoptera: Thripidae. Ecological Modelisation 70, 89-113.