Efficiency of neem and groundnut oils in protecting leguminous tree seeds against seed beetles in the Sahel

• Published in: Agroforestry systems Vol. 40; no. 1; pp. 29 - 40
• Main Authors: Cardet, C. (ENSH, Angers (France).), Kandji, T, Delobel, A, Danthu, P
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 01-01-1998; M. Nijhoff/Dr. W. Junk; Springer Nature B.V
• Subjects: ACACIA NILOTICA; ACEITE DE CACAHUETE; Agroforestry; Agronomy. Soil science and plant productions; Arachis hypogaea; Azadirachta indica; Biological and medical sciences; Biological control; CARYEDON; Control; Efficiency; EXTRACTOS DE MELIA; EXTRAIT DE NEEM; Fundamental and applied biological sciences. Psychology; Genetics and breeding of economic plants; GERMINACION; GERMINATION; GRAINE; GROUNDNUT OIL; HUILE D'ARACHIDE; INSECTE DEPREDATEUR DES SEMENCES; Insecticides; INSECTOS QUE ATACAN LAS SEMILLAS; Kernels; neem; NEEM EXTRACTS; Oils; Ovicides; Phytopathology. Animal pests. Plant and forest protection; Protozoa. Invertebrates; SAHEL; SEED DAMAGING INSECTS; SEED TREATMENT; SEEDS; Seeds and other planting stocks; SEMILLA; SENEGAL; TAMARINDUS INDICA; TRAITEMENT DES SEMENCES; TRATAMIENTO DE SEMILLAS; Trees; Sub-Saharan Africa; Sahel; Africa; Insecticide; Coleoptera; Insecta; Pesticide crop; Pest; Pest management; Dicotyledones; Angiospermae; Bruchidae; Chemical control; Hardwood forest tree; Fruit tree; Azadirachta indica; Peanut oil; Meliaceae; Storage; Leguminosae; Arthropoda; Seed; Ovicide; Caryedon serratus; Spermatophyta; Acacia nilotica; Invertebrata; Tamarindus indica; Viability; Comparative study
• ISSN: 0167-4366; 1572-9680
• DOI: 10.1023/A:1006092531845

The objective of our study was to test the comparative efficiency of neem (Azadirachta indica) kernel oil, groundnut oil and a synthetic insecticide, K-Othrine®, in protecting stocks of leguminous tree seeds against seed beetles under Sahelian conditions. The following insect/seed combinations were used as models: Caryedon acaciae/Acacia nilotica, C. longispinosus/A. raddiana and C. serratus/Tamarindus indica. Neem oil, when used at concentrations of 5 to 20 ml per kg of seeds, had pronounced adulticidal and ovicidal effects which were maintained for five months. No significant fall in seed viability was observed except in the case of C. acaciae/A. nilotica. Groundnut oil, when used at concentrations of 5 to 20 ml per kg of seeds, had pronounced adulticidal and ovicidal effects which were relatively short-lived. A significant fall in seed viability was observed over five months. K-Othrine®, when used at concentrations ranging from 25 to 100 mg per kg, had high adulticidal effects which were maintained for five months. However, K-Othrine® was found to have no ovicide properties. No significant fall in seed viability was observed. This study concluded that it is possible to use neem oil, a product that can be obtained locally at low cost, to efficiently protect tree seed stocks in the Sahel.[PUBLICATION ABSTRACT]