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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11106

Title: The effects of spore concentrations of entomogenous fungi on larval mortality and development of the maize stem borer Eldana saccharina Walker (Lepidoptera: Pyralidae)
Authors: Baidoo, P. K.
Ackuaku, S. K.
Issue Date: 2011
Publisher: Journal of Applied Biosciences
Citation: Journal of Applied Biosciences 47: 3221– 3229
Abstract: Objective: The use of chemical insecticides to control insect pests has detrimental effects on the environment. There is therefore the need to look for alternative means to manage pests which can achieve substantial pest control with no negative effects on the environment. This study was conducted to determine the effects of spore concentrations of entomogenous fungi on the mortality of Eldana saccharina. Methodology and Results: Entomogenous fungi were isolated from dead E. saccharina larvae and screened for pathogenicity. Different spore concentrations of the fungal species were tested against 2nd instar E. saccharina. Median lethal concentration (LC50) for each fungus was determined using probit transformed dose-response graphs. Fungal species identified were Aspergillus flavus, Verticillium alboatrum, Trichothecium spp., Fusarium oxysporum and Alternaria brassicicola. A. flavus had the least LC50 whilst F oxysporum recorded the largest LC50. Median lethal concentration of A. brassicicola was not determined because the pathogenicity test recorded only 22.5 % mortality. Conclusions and applications of findings: The effectiveness in the use of a fungus as a biological control agent for the control of insect pest depends on both the pathogenicity of the fungus and the number of infective spores that the insect is exposed to. The use of entomogenous fungi is a viable alternative in the control of insect pests. They have an added advantage because they kill only the target pests and are therefore environmentally friendly. The study indicated that mortality is influenced by dosage and therefore higher doses produced higher mortalities. These fungi occur naturally and can therefore be conserved and used as a component in an integrated approach to the management of maize stem borers.
Description: An article published by Journal of Applied Biosciences, 2011; 47: 3221– 3229
URI: http://hdl.handle.net/123456789/11106
ISSN: 1997-5902
Appears in Collections:College of Science

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