L’étude réalisée porte sur l’effet insecticide des extraitsfoliaires et racinaires d’EuphorbiaguyonianaBoiss. &Reut. (Euphorbiaceae), récoltées dans Oued Sebseb, Sahara septentrional Est Algérien sur les imagos de Triboliumcastaneum(Herbst, 1797). (Coleoptera-Tenebrionidae). L’extrait aqueux d’Euphorbiaguyoniana engendre une mortalité de 100% sur la population traitée. Ce pourcentage de mortalité est atteint au bout de moins 10 jours.L’estimation de la concentration d’efficacité 50 (CE50) et 90 (CE90) montrele fort effet insecticide de ces préparationsvis-à-vis des imagos de Triboliumcastaneum. Pour le lot d’insectestraitéspar l’extrait foliaire, lesvaleurs de CE50 et CE90 rapportées sont de l’ordre de 0,0158mg/ml et 0,0322mg/ml respectivement,et de 0,0186 mg/ml et 0,0394mg/ml pour l’extrait racinaire,respectivement. L’évaluation des temps létaux 50 (TL50) montre que les deux extraits d’Euphorbiaguyoniana ont une rapidité d’action particulière vis-à-vis des imagos de Triboliumcastaneum.
In this present study, the toxicity of Cleome arabica L. (Capparidaceae) seed oils was tested on L5 larvae of Schistocerca gregaria, Forsk. (Orthoptera-Acrididae). The forced administration of 60 ?L/individual of this vegetable oil leads to the death of all the treated larvae either before or after a few days of exuviation (imaginal moult). Signs of intoxication were observed a few hours after treatment, i.e. movement disorders, diarrhoea, inability to take food and weight loss. Male L5 larvae seem more sensitive than female L5; the mortality rates being around 90.91% and 36.36% respectively after 16 days. The TL50 recorded in treated L5 larvae is around 11 days.
The utilization of plant extraction products from Oeneanthe pimpinelloides (Apiaceae family) seeds were investigated in terms of their use as an insecticide control of packaging materials. The aim was to investigate their insecticidal effects against the flour beetle Tribolium castaneum. The Oeneanthe pimpinelloides seeds were extracted with methanol. By using the liquid-liquid extraction method, the hexane extract (II) was separated from the methanol extract (I) and hexane and methanol were evaporated. Then, the chemical composition of each sample was determined via gas chromatography–mass spectrometry. The methanol extract predominantly contained tetrahydrofuran, 1-methoxy-2-propanol, 1-methoxy, 2-butoxyethanol, 1-phenylethanone, cyclohexene carboxylate derivative, (3-phenyl-2-propynylidene) cyclopropane, diphenyldiazene, and dihydroxypropyl ester components, while the hexane fraction contained nonane, 1-octanol, decane, undecane, tridecane, alkyl benzene, benzene sulfonic acid, benzoxazine, and hexadecanoic acid components, as well as some derivatives of them. Each fraction was dissolved in DMSO for impregnation on filter paper. The insecticide effects of the paper samples were determined against Tribolium castneum. According to the results, the mortality started after 3 d for each fraction. After 4 d, the hexane fraction indicated total mortality in comparison with the methanol fraction, which showed partial mortality (3/5).
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