Bt maize and integrated pest management--a European perspective

Area of Science:

• Agricultural Entomology
• Crop Science
• Biotechnology

Background:

• European maize production faces significant threats from key arthropod pests like the European corn borer, Mediterranean corn borer, and western corn rootworm.
• Traditional pest control methods include chemical, biological, and cultural practices such as ploughing and crop rotation.
• Genetically engineered (GE) maize producing insecticidal compounds from Bacillus thuringiensis (Bt) has been available since 1996.

Purpose of the Study:

• To evaluate the role and impact of Bt maize as a pest control measure in European agriculture.
• To assess the benefits and limitations of Bt maize cultivation within an integrated pest management (IPM) framework.
• To analyze the current regulatory landscape and adoption challenges for Bt maize in the European Union (EU).

Main Methods:

• Review of existing literature on Bt maize efficacy, pest resistance, and secondary pest outbreaks.
• Analysis of farm operation data and income gains in regions with Bt maize adoption.
• Examination of EU regulations and national cultivation bans affecting Bt maize.

Main Results:

• Bt maize provides high pest control efficiency against target pests, simplifying farm operations and improving grain quality.
• Potential limitations include resistance evolution in pests, secondary pest outbreaks, and administrative burdens.
• Only one Bt maize event (MON810) is authorized in the EU, with several countries banning cultivation; Spain shows significant farm income gains.

Conclusions:

• Bt maize functions as a specific and effective tool in IPM, offering preventive (host plant resistance) and responsive pest control.
• Its integration with other control measures can address primary and secondary pest issues.
• Despite regulatory challenges, Bt maize demonstrates potential for economic and agronomic benefits where adopted.