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:2/27/2017)... (PRWEB) , ... February 27, 2017 , ... Robert E. ... large medical group. But his impoverished upbringing and life experiences could have led him ... a Physician: Insightful and Inspirational Tales of Parenting, Perseverance and Pediatrics,” Dr. Burke shares ...
(Date:2/27/2017)... ... February 27, 2017 , ... Orange County ... chronic inflammatory gum condition that occurs when the bacteria in plaque infect the gums ... to as a scaling and root planing or SRP, and can include surgical therapies ...
(Date:2/27/2017)... ... 2017 , ... Sunshine Coast Health Centre (SCHC), one of ... https://www.sunshinecoasthealthcentre.ca/ , is proud to announce the addition of a registered massage ... commitment to innovation in drug rehab and alcohol treatment strategies beyond a "punishment" ...
(Date:2/26/2017)... ... February 26, 2017 , ... Today, A' Design Awards & ... International Social Design Awards. , The 7th A' Social Design Award is ... Institutions worldwide with realized projects and conceptual works. , The first phase of ...
(Date:2/26/2017)... ... February 26, 2017 , ... ... technology standard in staffing, scheduling, and reporting for healthcare organizations. This comprehensive ... throughout the entire staffing process. StaffBridge technology improves staffing efficiency, maximizes resource ...
Breaking Medicine News(10 mins):
(Date:2/24/2017)... Feb. 24, 2017  Today, exocad America and ... have a new path to produce 510(K) cleared, ... implant library integrated into exocad DentalCAD software. In ... compliant Good Manufacturing Processes (GMP,s) into their organization, ... and complete an audit process. Then, dental labs can ...
(Date:2/24/2017)... Research and Markets has announced the addition of the "Global ... report to their offering. ... The Global Wireless Health Market is poised to ... to reach approximately $330.5 billion by 2025. This industry ... segments on global as well as regional levels presented in the ...
(Date:2/24/2017)... Research and Markets has announced the addition of the "Global ... report to their offering. ... The Global Empty Capsules Market is poised to grow at a CAGR ... by 2025. This industry report analyzes the market estimates ... regional levels presented in the research scope. The study provides historical market ...
Breaking Medicine Technology: