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:2/5/2016)... ... February 05, 2016 , ... Love is in the air at King Kullen! ... assortments and packaging. This staple for Valentine’s Day is a must-have, and can be ... Valentine’s Day, not only are long-stem roses available, but also other flower bouquets, elegantly ...
(Date:2/5/2016)... ... February 05, 2016 , ... ... of Popeyes Louisiana Kitchen restaurants, launched the 14th annual “Appetite for a Cure” ... adults with muscular dystrophy, ALS and related diseases that severely limit strength and ...
(Date:2/5/2016)... , ... February 05, 2016 , ... ... devoted exclusively to funding innovative lymphoma research and serving the lymphoma community through ... poised to once again host, Swirl, A Wine Tasting Event at the La ...
(Date:2/5/2016)... ... February 05, 2016 , ... Give To Cure today announced ... and donate to Give To Cure’s campaign that is crowdfunding clinical trials to help ... and share payments through a smart device. In 2015 alone, Venmo processed $7.5 billion ...
(Date:2/5/2016)... ... 2016 , ... Stuart Bentkover, MD, FACS is thrilled to announce ... most effective tattoo removal today, Dr. Bentkover is the only doctor in Central Massachusetts ... PicoSure has been approved by the Food and Drug Administration (FDA) as a safe ...
Breaking Medicine News(10 mins):
(Date:2/4/2016)... Wegener Polyangiitis - Pipeline Review, H2 ... Polyangiitis - Pipeline Review, H2 2015, provides an ... This report provides comprehensive information on the therapeutic ... at various stages, therapeutics assessment by drug target, ... and molecule type, along with latest updates, and ...
(Date:2/4/2016)... Frontier Pharma: Chronic Obstructive Pulmonary Disease ... Chronic Obstructive Pulmonary Disease (COPD) is ... the airways and lungs. Persistent breathing difficulties and ... one of the leading causes of morbidity and ... COPD is linked to cumulative exposure to risk ...
(Date:2/4/2016)... 2016 In response to the opioid abuse epidemic, ... for Medical Products and Tobacco, along with other FDA leaders, ... approach to opioid medications. The plan will focus on policies ... pain access to effective relief. --> ... Re-examine the risk-benefit paradigm for opioids and ensure that the ...
Breaking Medicine Technology: