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Grund, Julia and Hirsch, Lina, 2010. The potential of entomopathogenic fungal isolates as an environmentally friendly management option against Acanthoscelides obtectus. First cycle, G2E. Alnarp: SLU, Dept. of Plant Protection Biology



The bean bruchid, Acanthoscelides obtectus is a major threat to bean production. In Ethiopia, where this study was performed, the damage by bruchids on stored beans has been reported to reach up to 38%. To use the isolates Beauveria bassiana and Metarhizium anisopliae in the management of A. obtectus can be an environmentally safe alternative for controlling the pest. In the present work the aim was to examine if the four chosen fungal isolates, B. bassiana DLCO 43 and M. anisopliae DLCO 91, 76, 28, would provide an effective way of managing A. obtectus. To test the impact of each of the fungal isolates on A. obtectus mortality, insects were placed in a Petri dish and sprayed with the spore solutions in three concentrations; 1x105, 1x106 and 1x107 conidia/ml. All the fungal isolates had a high level of mycosis, ranging from 85-97%, meaning that a majority of the dead insects died of fungal infection. The control group had 0% in the mycosis test. The results show that all the fungal isolates, but especially the Metarhizium isolates, are effective against A. obtectus and achieve a high mortality.


Acanthoscelides obtectus är ett av de allvarligaste hoten mot produktionen av bönor. I Etiopien, där denna studie har utförts, har de skador som A. obtectus gör på lagrade bönor rapporterats nå upp till 38%. Att använda svampisolaten Beauveria bassiana och Metarhizium anisopliae for att bekämpa A. obtectus kan vara ett effektivt och miljövänligt alternativ. I det aktuella arbetet var syftet att undersöka om de fyra svampisolaten, B. bassiana DLCO 43 och M. anisopliae DLCO 91, 76, 28, skulle vara ett effektivt sätt att bekämpa A. obtectus. För att testa effekten av varje svampisolat på A. obtectus dödlighet, placerades insekterna i Petriskålar och sprayades med sporlösningar i tre koncentrationer, 1x105, 1x106 and 1x107 konidier/ml. Alla svampisolaten hade en hög nivå av mykos, från 85 till 97%, vilket innebär att en majoritet av de döda insekter dog av svampinfektion. Kontrollgruppen hade 0% i mykostestet. Resultaten visar att samtliga svampisolat, särskilt Metarhizium-isolaten, är effektiva mot Acanthoscelides obtectus och uppnår en hög dödlighet.

Main title:The potential of entomopathogenic fungal isolates as an environmentally friendly management option against Acanthoscelides obtectus
Authors:Grund, Julia and Hirsch, Lina
Supervisor:Hillbur, Ylva and Seyoum, Emiru
Examiner:Rämert , Birgitta
Series:Självständigt arbete vid LTJ-fakulteten, SLU
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2010
Level and depth descriptor:First cycle, G2E
Student's programme affiliation:Other
Supervising department:(LTJ, LTV) > Dept. of Plant Protection Biology
Keywords:Acanthoscelides obtectus, Beauveria bassiana, Metarhizium anisopliae, enthomopathogenic fungi, biological control agents, storage pests, pests in field
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Agricultural research
Protection of plants - General aspects
Pests of plants
Deposited On:20 Jan 2011 08:27
Metadata Last Modified:20 Apr 2012 14:17

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