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|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|
|Appears in Collections:||College of Science|
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