11 Jun 2013:
Growing Number of Pests
Developing Resistance to GM Crops
An increasing number of pest species are developing resistance to crops genetically engineered to be toxic to insects
, according to new research. In an analysis of 77 studies conducted in eight countries, a team of U.S. and French scientists found that five of 13 major pest species had become resistant to so-called Bt cotton or corn plants, which are genetically modified to exude a bacterium, Bacillus thuringiensis
, that is toxic to insects. Three of the cases occurred in the U.S., where half of all Bt plantings occur, while the others were in India and South Africa. In one instance, early signs of pest resistance to the plants appeared within two years. While researchers say all insects inevitably adapt to threats such as pesticides, the study found that farmers who planted non-Bt crops in nearby “refuges” were more likely to slow that resistance. “Either take more stringent measures to delay resistance, such as requiring larger refuges, or this pest will probably evolve resistance quickly,” said Bruce Tabashnik, a professor at the University of Arizona and lead author of the study published in the journal Nature Biotechnology
. The total land area planted annually with Bt crops has increased from 1.1 million hectares in 1996 to more than 66 million hectares in 2011, with a cumulative total of 420 million hectares.
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.
is now available for mobile devices at e360.yale.edu/mobile
The Warriors of Qiugang
, a Yale Environment 360
video, chronicles a Chinese village’s fight against a polluting chemical plant. It was nominated for a 2011 Academy Award for Best Documentary Short.
Watch the video.
Top Image: aerial view of Iceland
. © Google & TerraMetrics.
, winner of the Yale Environment 360 Video Contest, documents the work of African researchers monitoring wildlife in Uganda's remote Bwindi Impenetrable National Park. Watch the video.