Hybrid megapests evolving in Brazil are a threat to crops worldwide

image via New Scientist

January 23, 2026, 1:00 PM

• •Hybridization between cotton bollworm and corn earworm has led to pesticide resistance.
• •The hybrid pests threaten crops and global food security.
• •The spread is facilitated by a lack of proper resistance management.
• •New strains of Bt crops are being introduced to combat resistance.

The interbreeding of cotton bollworm and corn earworm in Brazil has created hybrid strains resistant to multiple pesticides. These "megapests" could cause significant damage to crops like soybeans, potentially impacting global food security due to Brazil's major role in food production. The spread of these resistant pests is exacerbated by factors such as the lack of adherence to resistance management practices and the introduction of new Bt crops. Addressing this issue requires effective resistance management and monitoring to prevent widespread crop losses and economic consequences.

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