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:5/27/2016)... ... 27, 2016 , ... An educational campaign aimed at everyone ... courtesy of awareness-driven celebrities and thought leaders. It also provides insight to the ... leaders such as Bioness. , As patients feel increasingly concerned about the ...
(Date:5/27/2016)... ... May 27, 2016 , ... Beleza Medspa has initiated ... regulations. This is the first time that Coolsculpting is being used for for ... six months to ensure they meet the prescribed body-fat standard, measured by the circumference-based ...
(Date:5/27/2016)... ... May 27, 2016 , ... Aimed at nurses and ... stories, which come courtesy of leaders in the nursing and health care industry. It ... advocates and associations—namely Abilene Christian University. , As the nursing industry is coming ...
(Date:5/27/2016)... (PRWEB) , ... May 27, 2016 , ... ... trusted name in the pharmaceutical, medical and food industries. Aside from its GMP ... certification (SIC), providing proof of successfully certified products, services and staff. , Validation ...
(Date:5/26/2016)... ... May 26, 2016 , ... There are many ways ... and Sausage Council (NHDSC) suggests that Americans prefer their dogs straight off the grill. ... say grilling is their favorite way to cook a hot dog, far outpacing other ...
Breaking Medicine News(10 mins):
(Date:5/27/2016)... Kitov Pharmaceuticals ... late-stage drug development, today announced the completion of ... batches required for registration of KIT-302 with the ... Kitov,s announcement in December 2015, that ... primary efficacy endpoint. "We are fortunate ...
(Date:5/26/2016)... May 26, 2016 A key ... is the emergence of new treatments. Cardax, a development ... osteoarthritis treatment. The therapy is expected to fulfil large ... UK is conducting studies to develop new treatments for ... the genes involved in osteoarthritis are being investigated, and ...
(Date:5/25/2016)... FDA 510(k) clearance covers Confocal Miniprobes ... and surgical applications Mauna Kea Technologies ... multidisciplinary confocal laser endomicroscopy (CLE) platform, today announced ... the 12 th 510(k) clearance from United ... FDA clearance covers Confocal Miniprobes indicated for use ...
Breaking Medicine Technology: