[ Effets de l’extrait aqueux des feuilles de ricin (Ricinus communis var sanguineus L.) sur les ravageurs et le rendement de la culture de niébé (Vigna unguiculata L.) dans la ville de MbujiMayi, RD Congo ]
Volume 83, Issue 2, March 2026, Pages 357–367
Aimé Tshibanda Fwabana1, André Kayombo Mbumba2, and John Tshibamba Mukendi3
1 Université Officielle de MbujiMayi, RD Congo
2 Université Officielle de MbujiMayi, RD Congo
3 Université Officielle de MbujiMayi, RD Congo
Original language: French
Copyright © 2026 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The objective of this study was to evaluate the efficacy of aqueous extract of ricin oil leaves on pests of two cowpea varieties in the field (Diamond and Mujilanga «H36» varieties) and to determine the best dose that promotes good yield. For the experiment, a completely randomized split plot design with four blocks and five treatments was set up, including the control (T0), Zalang 50EC (chemical insecticide) at 1 L/m2 (T1), ricin leaf aqueous extract at 1.125 L/ m2 (T2), ricin leaf aqueous extract at 1.375 L/ m2 (T3) and ricin leaf aqueous extract at 1.625 L/ m2 (T4). The results obtained; with regard to the production variables, the best treatments that induced a high yield were T1 with 1.20T/ha and T3 with 0.935T/ha for the diamond variety (V1) and T1 with 1.22T/ha and T3 with 0.915T/ha for the Mujilanga variety (V2). As for the phytosanitary variables, the insect pests identified before and after the first application of phytosanitary products (organic and synthetic) were Ootheca mutabilis, Thrips megalothrips, Mylabri ssp, Muracate vitrata and pod bugs. After the second application, Aneplocnemis curvipes appeared while Thrips megalothrips and Mylabri ssp were no longer identified. The number of these insect pests decreased significantly after the application of plant protection products, except for the control treatment (T0) in which the number of insect pests increased with the cowpea crop cycle.
Author Keywords: Ricin, pests, cowpea, yield.
Volume 83, Issue 2, March 2026, Pages 357–367
Aimé Tshibanda Fwabana1, André Kayombo Mbumba2, and John Tshibamba Mukendi3
1 Université Officielle de MbujiMayi, RD Congo
2 Université Officielle de MbujiMayi, RD Congo
3 Université Officielle de MbujiMayi, RD Congo
Original language: French
Copyright © 2026 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The objective of this study was to evaluate the efficacy of aqueous extract of ricin oil leaves on pests of two cowpea varieties in the field (Diamond and Mujilanga «H36» varieties) and to determine the best dose that promotes good yield. For the experiment, a completely randomized split plot design with four blocks and five treatments was set up, including the control (T0), Zalang 50EC (chemical insecticide) at 1 L/m2 (T1), ricin leaf aqueous extract at 1.125 L/ m2 (T2), ricin leaf aqueous extract at 1.375 L/ m2 (T3) and ricin leaf aqueous extract at 1.625 L/ m2 (T4). The results obtained; with regard to the production variables, the best treatments that induced a high yield were T1 with 1.20T/ha and T3 with 0.935T/ha for the diamond variety (V1) and T1 with 1.22T/ha and T3 with 0.915T/ha for the Mujilanga variety (V2). As for the phytosanitary variables, the insect pests identified before and after the first application of phytosanitary products (organic and synthetic) were Ootheca mutabilis, Thrips megalothrips, Mylabri ssp, Muracate vitrata and pod bugs. After the second application, Aneplocnemis curvipes appeared while Thrips megalothrips and Mylabri ssp were no longer identified. The number of these insect pests decreased significantly after the application of plant protection products, except for the control treatment (T0) in which the number of insect pests increased with the cowpea crop cycle.
Author Keywords: Ricin, pests, cowpea, yield.
Abstract: (french)
L’objectif de cette étude était d’évaluer l’efficacité de l’extrait aqueux des feuilles de Ricin sur les ravageurs de deux variétés du niébé au champ (Variétés Diamant et Mujilanga «H36») et d’en déterminer la meilleure dose qui favorise un bon rendement. Pour l’expérimentation, un dispositif complètement randomisé en split plot à quatre blocs et cinq traitements a été mis en place, notamment le témoin (T0), la Zalang 50EC (insecticide chimique) à 1 L/m2 (T1), l’extrait aqueux des feuilles de ricin à 1,125 L/ m2 (T2), l’extrait aqueux des feuilles de ricin à 1,375 L/ m2 (T3) et l’extrait aqueux des feuilles de ricin à 1,625 L/ m2 (T4). Les résultats obtenus; en ce qui concerne les variables de production, les meilleurs traitements ayant induits un rendement élevé sont T1 avec 1,20T/ha et T3 avec 0,935 T/ha pour la variété diamant (V1) et T1 avec 1,22T/ha et T3 avec 0,915T/ha pour la variété Mujilanga (V2). Quant aux variables phytosanitaires, les insectes ravageurs identifiés avant, après la première application des produits phytosanitaires (bio et synthèse) sont les Ootheca mutabilis, Thrips megalothrips, Mylabri ssp, Muracate vitrata et les punaises de gousses. Après la deuxième application, l’Aneplocnemis curvipes est apparu alors que les Thrips megalothrips et Mylabri ssp n’ont plus été identifiés. Le nombre de ces insectes ravageurs décroit sensiblement après l’application des produits phytosanitaires, exception faite pour le traitement témoin (T0) dans lequel le nombre des insectes ravageurs croit avec le cycle de la culture de niébé.
Author Keywords: Ricin, ravageurs, niébé, rendement.
How to Cite this Article
Aimé Tshibanda Fwabana, André Kayombo Mbumba, and John Tshibamba Mukendi, “Effects of the aqueous extract of castor leaves (Ricinus communis var sanguineus L.) on pests and the yield of cowpea (Vigna unguiculata L.) cultivation in the city of Mbuji-Mayi, DR Congo,” International Journal of Innovation and Scientific Research, vol. 83, no. 2, pp. 357–367, March 2026.
