How contradictory EU policies led to the development of a pest: The story of oilseed rape and the cabbage stem flea beetle

Oilseed rape can be used to produce biodiesel which can substitute non‐renewable fuels for transport. In the early 2000s, the EU introduced a series of policies and market‐based incentives to encourage the production of biofuels to meet their obligations to reduce greenhouse gas emissions. This led to a large increase in the area of oilseed rape grown across Europe with a simultaneous rise in insect pests which were largely controlled by synthetic insecticides. However, the withdrawal of neonicotinoid seed treatments in 2013 and the development of insecticide resistance in key insect pests led to crop failures and significant yield losses. Integrated Pest Management approaches could have prevented this pest problem; however, the lack of support and clear financial mechanisms for the enforcement of the 2009 Sustainable Use of Pesticides Directive meant that the cabbage stem flea beetle (CSFB; Psylliodes chrysocephala) has become a serious pest and the area of oilseed rape grown is now falling sharply leading to the need for imports. We suggest that it is imperative for Integrated Pest Management approaches to now become written into new EU and UK policies and to incentivise the development of tools required for implementation and use by farmers. EU policies to reduce greenhouse gas emissions (Biofuels Policy (2003), Energy taxation, and Renewable energy (2009)) led to a 78% increase in the oilseed rape (OSR) area grown across Europe. The consequential increase in pest incidence and development of pyrethroid insecticide resistance, plus the ban on neonicotinoid seed treatments (2014), led to severe pest problems from cabbage stem flea beetle (Psylliodes chrysocephala) resulting in the reduction in area of OSR grown and a need for palm‐oil imports. Integrated Pest Management can reduce insecticide dependency and should be written into new EU and UK policies, and the development of tools required for implementation and use by farmers incentivised.