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Bioassays for Monitoring Insecticide Resistance

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Published on: December 30, 2010

Widespread adoption of Bt cotton and insecticide decrease promotes biocontrol services.

Yanhui Lu¹, Kongming Wu, Yuying Jiang

¹State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193 China.

|June 23, 2012

Summary

This summary is machine-generated.

Widespread use of Bacillus thuringiensis (Bt) cotton in China increased populations of beneficial insect predators and decreased pests. This suggests Bt crops can enhance biological pest control services across agricultural landscapes.

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Area of Science:

Agricultural Entomology
Ecology
Biotechnology

Background:

Transgenic Bacillus thuringiensis (Bt) crops reduce insecticide use.
Reduced insecticide sprays may enhance natural pest control by arthropod predators.
Long-term, landscape-level impacts of Bt crops on biocontrol are not well understood.

Purpose of the Study:

To investigate the long-term landscape-level effects of Bt cotton adoption on arthropod predator and pest populations.
To assess if Bt crops enhance biocontrol services in agricultural landscapes.

Main Methods:

Analysis of data from 1990-2010 across 36 sites in northern China.
Monitoring of generalist arthropod predators (ladybirds, lacewings, spiders) and aphid pests.
Correlation of predator/pest abundance with Bt cotton adoption and insecticide use.

Main Results:

Widespread Bt cotton adoption correlated with increased abundance of ladybirds, lacewings, and spiders.
Aphid pest populations significantly decreased in areas with Bt cotton.
Evidence suggests biocontrol services spill over from Bt cotton to adjacent maize, peanut, and soybean fields.

Conclusions:

Bt cotton adoption promotes beneficial arthropod predator populations.
Bt crops can enhance landscape-level biological pest control services.
This study demonstrates ecological benefits of Bt crops beyond direct pest control.