[en] The acute toxicity of essential oils from the whole fruit (EF) or from the fibres of the fruit (FF) of the local aromatic plants Xylopiα αethiopicα Dunal (Annonaceae) collected in north Cameroon was evaluated on Sitophilus zeαmαis adults. A concentration of 1 ml of essential oil per 100 g of maize seeds was tested to determine weevil mortality after 24 h of exposure. Under these conditions, the essential oil derived from both EF and FF of X. αethiopicα led to 100% mortality. In a second step, proportions of active compounds present in the oil of both EF and FF of X. αethiopicα were quantified. The toxicity of the four main compounds was tested
against S. zeαmαis: α-pinene, β-pinene, -3-carene and terpinen-4-ol according to their proportion in the essential oil of the concerned plant part. β-pinene and terpinen-4-ol were responsible for 50% of the mortality at the proportion found in EF and FF essential oils respectively. When mixed, a synergic effect of the compounds was observed that restored the mortality percentage observed for the crude oil. It appears that X. αethiopicα essential oil could be a potential source of natural and low-cost insecticide to control storage pests.
Disciplines :
Entomology & pest control
Author, co-author :
Kouninki, Habiba; Université Catholique de Louvain - UCL > Unité d'Ecologie et de Biogéographie
Hance, Thierry; Université Catholique de Louvain - UCL > Unité d'Ecologie et de Biogéographie
Noudjou, Félicité A.; Faculté Universitaire des Sciences Agronomiques de Gembloux - FUSAGx
Lognay, Georges ; Faculté Universitaire des Sciences Agronomiques de Gembloux - FUSAGx > Unité de Chimie Analytique
Malaisse, François ; Faculté Universitaire des Sciences Agronomiques de Gembloux - FUSAGx > Laboratoire d'Ecologie
Ngassoum, Martin. B.; Université de Ngaoundéré > Département de Chimie Appliquée > ENSAI
Mapongmetsem, Pierre M.; Université de Ngaoundéré - Faculté des Sciences > Département des Sciences Biologiques
Ngamo, Léonard S.T.; Université de Ngaoundéré - Faculté des Sciences > Département des Sciences Biologiques
Haubruge, Eric ; Faculté Universitaire des Sciences Agronomiques de Gembloux - FUSAGx > Unité d'Entomologie Fonctionnelle et Evolutive
Language :
English
Title :
Toxicity Of Some Terpenoids Of Essential Oils Of Xylopia Aethiopica From Cameroon Against Sitophilus Zeamais Motschulsky
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