Assessing the potential of biopesticides to control the cabbage stem flea beetle Psylliodes chrysocephala
Price, C.S.V, Campbell, H. and Pope, T.W. (2023) Assessing the potential of biopesticides to control the cabbage stem flea beetle Psylliodes chrysocephala. Pest Management Science. ISSN 1526-498X
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Abstract
BACKGROUND Cabbage stem flea beetle (CSFB) is an economically important pest of oilseed rape crops in Europe that was effectively controlled by neonicotinoid insecticide seed treatments until they were banned by the European Union in 2013. Since then, CSFB has been a difficult pest to control effectively, in part due to many populations having developed resistance to pyrethroids, the only authorized insecticides used to control this pest in many countries. Alternative solutions are therefore necessary, such as biopesticides. We tested an entomopathogenic fungus, three entomopathogenic bacteria isolates, two fatty acids and azadirachtin against CSFB adults under laboratory conditions. We also tested the efficacy of the pyrethroid insecticide lambda-cyhalothrin. RESULTS Fatty acids were effective, with up to 100% CSFB mortality after 24 h. The entomopathogenic fungus Beauveria bassiana resulted in up to 56% mortality 14 days after treatment. Entomopathogenic bacteria formulations and azadirachtin were not effective (<50% and <40% mortality, respectively). Results from a bioassay using lambda-cyhalothrin indicated that the CSFB used in this study were resistant to this insecticide. CONCLUSION Entomopathogenic fungi and fatty acids could potentially be used to control CSFB as part of an integrated pest management programme. This study is the first to investigate the efficacy of different biopesticides to control CSFB under laboratory conditions. As such, these biopesticides require further testing to optimise the formulation and application methods, and to assess the impact on nontarget organisms. Finally, efficacy under field conditions must be determined to understand the influence of environmental variables.
| Item Type: | Article |
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| Keywords: | oilseed rape, fatty acids, azadirachtin, entomopathogens, biological control, integrated pest management |
| Divisions: | Agriculture and Environment (from 1.08.20) |
| Depositing User: | Mrs Rachael Giles |
| Date Deposited: | 13 Nov 2023 14:39 |
| Last Modified: | 13 Nov 2023 14:39 |
| URI: | https://hau.repository.guildhe.ac.uk/id/eprint/18016 |
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