Navigation Links
Larger refuges needed to sustain success of transgenic corn
Date:6/8/2012

This release is also available in Chinese on EurekAlert! Chinese.

Transgenic crops that produce insect-killing proteins from the bacterium Bacillus thuringiensis (Bt) have reduced reliance on insecticide sprays since 1996. Yet, just as insects become resistant to conventional insecticides, they also can evolve resistance to the Bt proteins in transgenic crops. Thus, to delay pest resistance, the U.S. Environmental Protection Agency (EPA) has required farmers to plant "refuges" of crops that do not produce Bt proteins near Bt crops. But how much refuge acreage is enough?

In "Delaying Corn Rootworm Resistance to Bt Corn," an article appearing in the June, 2012 issue of the Journal of Economic Entomology, authors Bruce Tabashnik (University of Arizona) and Fred Gould (North Carolina State University) conclude the EPA should more than double the percentage of corn acres planted to mandated refuges to delay insect resistance, encourage integrated pest management (IPM), and promote more sustainable crop protection.

To slow resistance in the western corn rootworm (Diabrotica virgifera virgifera), one of the most economically important crop pests in the United States, the EPA currently requires a 20% refuge for corn producing one Bt protein (Cry3Bb1), and a 5% refuge for corn that simultaneously produces two different Bt proteins. However, the authors note that this devastating pest has rapidly evolved resistance to Cry3Bb1 in some areas of the U.S. corn belt. For Bt corn to remain effective against rootworms, they recommend increasing refuge requirements to 50% for corn producing one Bt protein and 20% for corn producing two Bt proteins.

"Corn rootworms can cost U.S. farmers close to $1 billion each year. Bt corn has helped to reduce these costs and to decrease insecticide sprays, but evolution of resistance by the pests can diminish or even eliminate these benefits." said Dr. Tabashnik. "To delay pest resistance and sustain the benefits of Bt corn, we recommend planting more corn that does not produce Bt toxins active against rootworms. This approach, called the refuge strategy, allows the susceptible pests to survive and has worked to slow resistance of other pests to Bt crops."

"Most of the corn seed currently produced in the U.S. is transgenic and includes genes for insect control," said Dr. Gould. "Enlarging refuges will require more seed without corn rootworm control genes. This shift in production will take time, so this process should begin immediately."

In addition to increased refuge sizes, the authors write that the best way to postpone resistance is to use IPM, in which Bt corn is combined with other control tactics such as crop rotation and judicious use of insecticide sprays.


'/>"/>
Contact: Bruce E. Tabashnik
brucet@cals.arizona.edu
520-621-1141
Entomological Society of America
Source:Eurekalert

Related biology technology :

1. Quantum control protocols could lead to more accurate, larger scale quantum computations
2. Fundamental steps needed now in global redesign of Earth system governance
3. New Study: Health Professionals Support Biotechnologys Use In Food Products And Sustainable Farming
4. Scholars call for global governance overhaul to ensure Earths sustainability
5. Farm weeds have crucial role in sustainable agriculture
6. NIRI San Diego May Meeting: Seasoned IROs Discuss "Tips & Tactics for Establishing and Maintaining A Successful Investor Relations Program"
7. Customer Satisfaction, A key to Success: Narang Medical Limited
8. Floridas Leading Fertility Center Announces Successful Baby Delivery via Egg Freezing
9. Innocoll Announces Successful End-of-Phase 2 Meeting with FDA for XaraColl® and Agreement of the Phase 3 Program
10. First successful human results achieved: Implantable wireless microchip drug delivery device
11. Successful human tests for first wirelessly controlled drug-delivery chip
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/21/2017)... ... 2017 , ... MacArthur Sotheby’s International Realty, a luxury real ... the first Delos Wellness Signature™ residence in Hawaii is on the market for ... listing agent Kelly Allen, R(S) of Carvill Sotheby’s International Realty located on Oahu, ...
(Date:8/21/2017)... ... August 21, 2017 , ... Baltimore biotech firm, PathSensors, Inc., ... bring its proprietary CANARY pathogen detection technology and high throughput testing solutions to ... purchased an undisclosed number of PathSensors’ Zephyr pathogen detection instruments and will act ...
(Date:8/21/2017)... , ... August 21, 2017 , ... ... two speakers for this two-part educational webinar, in which attendees will learn about ... associated protein factor composition. Along with an overview of the development and validation ...
(Date:8/18/2017)... ... August 18, 2017 , ... ... will feature Federal Hybrids, Inc. in an upcoming episode, scheduled to broadcast fourth ... Farmer will explore Federal Hybrids, the independent, family-owned seed company. Educating audiences about ...
Breaking Biology Technology:
(Date:4/17/2017)... April 17, 2017 NXT-ID, Inc. (NASDAQ: ... the filing of its 2016 Annual Report on Form 10-K on ... ... is available in the Investor Relations section of the Company,s website ... SEC,s website at http://www.sec.gov . 2016 Year Highlights: ...
(Date:4/11/2017)... Apr. 11, 2017 Research and Markets has ... report to their offering. ... The global eye tracking market to grow at a CAGR of ... Eye Tracking Market 2017-2021, has been prepared based on an in-depth ... market landscape and its growth prospects over the coming years. The ...
(Date:4/5/2017)...  The Allen Institute for Cell Science today announces ... portal and dynamic digital window into the human cell. ... application of deep learning to create predictive models of ... a growing suite of powerful tools. The Allen Cell ... publicly available resources created and shared by the Allen ...
Breaking Biology News(10 mins):