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Title: Oviposition, ovicidal and feeding responses of potato tube Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae) to Birbira, Millettia ferruginea (Hochst) Baker (Legumionosae: papilionideae) seed powder extracts. r moth
Authors: Ayalew, Tadesse
Advisors: Dr. Emiru Seyoum
Keywords: BIOLOGY
Copyright: Jun-2010
Date Added: 9-May-2012
Publisher: AAU
Abstract: The use of native plant species, Millettia ferruginea (Hochst) Baker known locally as birbira, its deterrent/toxicity was assayed in relation to oviposition, ovicidal and feeding (larval settlement) responses of PTM. M. ferruginea seed powder extracts obtained using solvents of varying polarities (water, acetic acid, acetone, chloroform, toluene and hexane) at eight serial diluents (w/v: 0.0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2 and 1.4mg birbira seed powder/ml of water) were prepared. The PTM eggs for ovicidal and the host plant parts: potato tubers for oviposition, larvae feeding and adult emergence, leaves for oviposition and neonate larvae settlement (settled, deterred and died) responses were treated with seed powder extracts of birbira at each rate of application. From the five replicates, observation were taken on the number of eggs laid, active and terminated galleries, settled, deterred and died neonate larvae, emerged healthy and deformed adults and number of eggs hatched and unhatched. Finally, the mean number of eggs laid on treated and away treated substrates, active and terminated galleries, mean number of successfully settled, rejected and died neonate larvae and % of egg hatchability was analyzed. The LC50 values of birbira seed powder extracts for PTM eggs and neonates were also determined, too. Results revealed that the number of eggs laid on tubers and leaves, the number of active and terminated galleries carved by PTM larvae, percentage of unhatched eggs, were inversely proportional to the increase in rates of the extracts, whereas the number of eggs laid on cages and chambers inner surfaces increase with the increase in the rate of application of the extracts. Adult emergence did not show clear pattern as was the case for most of the cases with the larvae and extracts has no impact in deformity of adult except in acetic acid and chloroform. All birbira seed powder extracts applied on host plant leaf inhibit settling of PTM neonate larvae and its lethal effect to neonates increase with increased rates of application and hours of exposure. The results in this study confirmed that M. ferruginea is a potential natural insecticide of many insect pests.
URI: http://hdl.handle.net/123456789/2841
Appears in:Thesis - Biology

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