Navigation Links
Insect resistance to Bt crops can be predicted, monitored and managed
Date:11/23/2009

Since 1996, crop plants genetically modified to produce bacterial proteins that are toxic to certain insects, yet safe for people, have been planted on more than 200 million hectares worldwide. The popularity of these Bt crops, named after the bacterium Bacillus thuringiensis, comes from their ability to kill some major pests, allowing farmers to save money and lessen environmental impacts by reducing insecticide sprays.

However, since insects can evolve resistance to toxins, strategies must be implemented to ensure that Bt crops remain effective. A new study published in the December issue of Journal of Economic Entomology entitled "Field-Evolved Insect Resistance to Bt Crops: Definition, Theory, and Data" (http://www.entsoc.org/btcrops.pdf) analyzes insect resistance data from five continents, as reported in 41 studies, and concludes that existing theories and strategies can be used to predict, monitor, and manage insect resistance to Bt crops.

According to lead author Dr. Bruce E. Tabashnik, "Resistance is not something to be afraid of, but something that we expect and can manage if we understand it. Dozens of studies monitoring how pests have responded to Bt crops have created a treasure trove of data showing that resistance has emerged in a few pest populations, but not in most others. By systematically analyzing the extensive data, we can learn what accelerates resistance and what delays it. With this knowledge, we can more effectively predict and thwart pest resistance."

Among the authors' conclusions are:

  • The refuge strategy (growing non-Bt crops near the Bt crops) can slow the evolution of insect resistance by increasing the chances of resistant insects mating with non-resistant ones, resulting in non-resistant offspring.

  • Crops that are "pyramided" to incorporate two or more Bt toxins are more effective at controlling insect resistance when they are used independently from crops that contain only one Bt toxin.

  • Resistance monitoring can be especially effective when insects collected from the field include survivors from Bt crops.

  • DNA screening can complement traditional methods for monitoring resistance, such as exposing insects to toxins in the lab.

  • Despite a few documented cases of field-evolved resistance to the Bt toxins in transgenic crops, most insect pest populations are still susceptible.

With Bt crop acreage increasing worldwide, incorporating enhanced understanding of observed patterns of field-evolved resistance into future resistance management strategies can help to minimize the drawbacks and maximize the benefits of current and future generations of transgenic crops.


'/>"/>

Contact: Richard Levine
rlevine@entsoc.org
301-731-4535
Entomological Society of America
Source:Eurekalert

Related medicine news :

1. Free distribution of insecticide-treated mosquito nets can save lives
2. Kenyan malaria success strengthens call for free insecticide-treated nets for all
3. IVCC launches groundbreaking insecticide projects with Bayer and Syngenta
4. Repellents between dusk and bedtime make insecticide-treated bednets more effective
5. Violent sex acts boost insects immunity system
6. TyraTech Achieves Insecticide Development and Financial Milestones With Partner Arysta LifeScience
7. Safe, Green Insecticides Can Reduce Chemical Exposure in Homes and Gardens
8. Working Towards Counting Malaria Out Through Scale-Up of PermaNet(R) Bed Nets, Vestergaard Frandsen Produces 175 Millionth Net; Introduces New Net To Combat Insecticide Resistance
9. How social insects recognize dead nestmates
10. Using insects to test for drug safety
11. Household Insecticides May Be Linked to Autoimmune Diseases
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/25/2016)... ... 25, 2016 , ... "With 30 hand-drawn hand gesture animations, FCPX users can ... CEO of Pixel Film Studios. , ProHand Cartoon’s package transforms over 1,300 hand-drawn ... X . Simply select a ProHand generator and drag it above media or text ...
(Date:6/25/2016)... ... ... On Friday, June 10, Van Mitchell, Secretary of the Maryland Department of Health and ... their exemplary accomplishments in worksite health promotion. , The Wellness at Work Awards took ... the BWI Marriott in Linthicum Heights. iHire was one of 42 businesses to receive ...
(Date:6/24/2016)... ... June 24, 2016 , ... June 19, 2016 is World Sickle Cell Observance ... and the benefits of holistic treatments, Serenity Recovery Center of Marne, Michigan, ... Disease. , Sickle Cell Disease (SCD) is a disorder of the red blood cells, ...
(Date:6/24/2016)... ... 24, 2016 , ... Dr. Amanda Cheng, an orthodontist ... has extensive experience with all areas of orthodontics, including robotic Suresmile technology, ... , Micro-osteoperforation is a revolutionary adjunct to orthodontic treatment. It can be used ...
(Date:6/24/2016)... ... June 24, 2016 , ... ... Clinical Decision Making in Emergency Medicine conference in Ponte Vedra Beach, FL. The ... published in Emergency Medicine Practice and Pediatric Emergency Medicine Practice. , ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... ANDOVER, Mass. and SAN CLEMENTE, Calif. ... California -based mobile pulmonary function testing company, is now ... portable PFT devices developed by ndd Medical Technologies , Inc. ... PFT testing done in hospital-based labs.  Thanks to ndd,s EasyOne PRO ... CA , can get any needed testing done in the ...
(Date:6/24/2016)... Belgium , June 24, 2016 ... the appointment of Dr. Edward Futcher ... Non-Executive Director, effective June 23, 2016.Dr. Futcher was ... Nominations and Governance Committees.  As a non-executive member ... independent expertise and strategic counsel to VolitionRx in ...
(Date:6/23/2016)... June 23, 2016 Any dentist who has made ... the current process. Many of them do not even offer ... difficulties and high laboratory costs involved. And those who ARE ... at such a high cost that the majority of today,s ... Dr. Parsa Zadeh , founder of Dental Evolutions Inc. ...
Breaking Medicine Technology: