Garlic And Orange Plant Materials Evaluation For The Control Of Sitophilus Spp. (coleoptera Curculionidae) And Zabrotes Subfasciatus (coleoptera Bruchidae) In Ethiopia.

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At present much emphasis is being placed in the use of botanical pesticide in thernprotection of storage insect pests, which have gradually been ignored and also to avoidrnproblems with insecticide resistance. Experiments were conducted to determine thernefficacy of Allium sativum L. and Citrus sinesis L. against Sitophilus spp. and Zabrotesrnsubfasciatus under laboratory conditions. For comparison pirimiphos-methyl andrnuntreated check were included and the experiments arranged in a completely randomizedrndesign with three replications. One hundred percent mortality of Sitophilus spp. wasrnobtained with water and acetone extracts at the rate of 30g/100ml applied at 3ml/ filterrnpaper after 48 and 96 hour of exposure, respectively. Similar result was obtained for Z.rnsubfasciatus at 20g/100ml rate of extraction. Essential oil from C. sinesis at the highestrnrate of 750mg/10 ml of acetone applied at 3ml per filter paper gave 100% mortality forrnboth Z. subfasciatus and Sitophilus spp.rnAllium sativum applied as powder and extracts to the haricot bean were toxic to Z.rnsubfasciatus which caused significant percent mortality of weevils. The highestrnconcentration of acetone extract of A. sativum applied at the rate 15ml/250g of grainrncaused 82 percent mortality after 96 hours. Grains treated with 15g of sun dried powderrnof orange peel and 750mg of essential oil killed 65 and 67 percent of Z. subfasciatus afterrn96 hours respectively. Similarly, A. sativum power had low effect on progeny productionrnof Z. subfasciatus, but grains treated with ethanol and acetone extracts of A. sativum,rnorange peel powder and essential oil of orange peel reduced progeny production of Z.rnsubfasciatus by more than 92 percent. Citrus sinesis peel oil reduced 100 percent progeny production of Z. subfasciatus at all dosage levels used. All the treatments were repellentrnto Z. subfasciatus, with the highest dosage of ethanol extracts of A. sativum and freshrnchopped garlic evoking the highest repellent action. The treatments, however, showedrnlower repellency effect against Sitophilus spp. except fresh chopped garlic with 72rnpercent repellency. The essential oil of orange peel had a high level of toxicity in thernfumigation bioassay against Z. subfasiatus and Sitophilus species in impregnated filterrnpaper. The effect of these promising botanicals on weevil progeny survival as well as onrnseed germination and seed weight loss are discussed.

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Garlic And Orange Plant Materials Evaluation For The Control Of Sitophilus Spp. (coleoptera Curculionidae) And Zabrotes Subfasciatus (coleoptera Bruchidae) In Ethiopia.

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