Biocontrol Science and Technology (1999) 9, 199-214

J. Langewald, Z. Ouambama, A. Mamadou, R. Peveling, I. Stolz, R. Bateman, S. Blanford, S. Arthurs, S. Attignon and C. Lomer (1999)
Comparison of an organophosphate insecticide with a mycoinsecticide for the control of Oedaleus senegalensis (Orthoptera : Acrididae) and other Sahelian grasshoppers at an operational scale
Biocontrol Science and Technology 9 (2), 199-214
Abstract: Operational scale field trials were conducted in 1996 and 1997, in the east of the Niger Republic, on 50 and 800 hectare plots, to compare the efficacy of an oil based formulation of the entomopathogenic fungus, Metarhizium anisopliae var. acridium (Deuteromycotina: Hyphomycetes) with fenitrothion for the control of the Senegalese Grasshopper, Oedaleus senegalensis Krauss. Metarhizium anisopliae var. acridium was applied at 5 x 1012 spores per ha, at a volume application rate of 2l and 0.5l per hectare. Fenitrothion was applied at 220g per hectare, at 1.25 and 0.22 litres per hectare volume application rates. Both formulations were applied using Ultra Low Volume equipment mounted on a vehicle or a fixed wing aircraft. The M. anisopliae var. acridium treatment reduced the grasshopper population significantly and maintaining it at low levels. Fenitrothion caused a fast population reduction shortly after application, but due to immigration and hatching, the grasshopper population recovered quickly reaching the initial level. The survival of spores in the spray residue of the M. anisopliae var. acridium plots was assessed exposing grasshoppers to the sprayed vegetation at intervals and monitoring disease levels during subsequent incubation in the laboratory over six weeks. The results will be discussed in view of the development of an IPM strategy for grasshopper control in the Sahel.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Jürgen Langewald, Zakaria Ouambama, Ralf Peveling, Roy Bateman, Steven Arthurs, Chris J. Lomer, Simon Blanford

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
control - general
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection
population dynamics/epizootiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Oedaleus senegalensis		Niger
Metarhizium acridum (entomopathogen)	Oedaleus senegalensis		Niger