Navigation Links
Bigger refuges needed to delay pest resistance to biotech corn
Date:6/8/2012

in the U.S. and only one year after this type of Bt corn was first planted on more than 25 million acres.

According to Tabashnik, Cry3Bb1 is effective enough to be economically useful, but not effective enough to meet the so-called high dose standard, the ability to kill at least 99.99 percent of susceptible pests and also nearly all of the hybrid pests that are produced when resistant pests mate with susceptible pests.

"When Bt crops meet the high dose standard, resistant individuals are extremely rare, and smaller refuges work fine, because you might have one resistant insect in a million. In this case, a 20 percent refuge provides enough susceptible individuals to dilute that rare resistance."

But plants with Cry3Bb1 allow survival of 1 to 6 percent of pests, which is expected to quickly select for resistance.

"A single farm can have millions of these beetles," Tabashnik explained. "If 1 to 6 percent survive on Bt corn, you have tens of thousands of potentially resistant insects and the refuge needs to be much bigger."

Tabashnik's research has shown that in Arizona, Bt cotton meets the high dose standard against pink bollworm and the small refuge strategy has prevented resistance for more than a decade.

On the other hand, Tabashnik pointed to a case in Puerto Rico, where adequate refuges were not planted. Within a few years, the pests evolved resistance and devoured the Bt corn plants. The biotechnology companies voluntary stopped selling Bt corn seed there, but five years later, the insects remain resistant to the toxin.

Although biotech companies recently starting selling some varieties of Bt corn that produce combinations of Bt toxins, Tabashnik said, the resistance to one toxin still raises concerns.

"You can think of the multi-Bt toxin approach as a pyramid: The base has to be stable. If one of your building blocks, which is susceptibility to Cry3Bb1, is crumbling, you have a problem.
'/>"/>

Contact: Daniel Stolte
stolte@email.arizona.edu
520-626-4402
University of Arizona
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Bigger gorillas better at attracting mates and raising young
2. Increasing water scarcity in Californias Bay-Delta will necessitate trade-offs; hard decisions needed to balance various environmental risks
3. Urgent research needed to determine most effective follow-up care for lung cancer patients
4. Report addresses challenges in implementing new diagnostic tests where they are needed most
5. European mountain plant population shows delayed response to climate change
6. Researchers attempt to solve problems of antibiotic resistance and bee deaths in one
7. BRG1 mutations confer resistance to hormones in lung cancer
8. Genetic variation in East Asians found to explain resistance to cancer drugs
9. New paper examines poison resistance in snakes around the world
10. Hot on the trail of metabolic diseases and resistance to antibiotics
11. Notre Dame researchers using novel method to combat malaria drug resistance
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Bigger refuges needed to delay pest resistance to biotech corn
(Date:4/17/2014)... German . ... also provide us with a continuous stream of information about ... sit still in a car the world glides by ... Seemingly without effort, our brain calculates self-motion from this "optic ... a steady gaze during our own movements. Together with biologists ...
(Date:4/17/2014)... available in German . ... protection money demanded of him, he can expect his premises ... as fear of the consequences is enough to make restaurant ... birds, which lay their eggs in other birds, nests. If ... parasites take their revenge by destroying the entire nest. Consequently, ...
(Date:4/17/2014)... painted a stark warning on the possible effects of ... effect 32 times that of carbon dioxide. Now a ... act as fully regenerable electron acceptors which helps explain ... instead of being released to the atmosphere. However, there ... may enter into a vicious cycle to release large ...
Breaking Biology News(10 mins):How vision makes sure that little fish do not get carried away 2How vision makes sure that little fish do not get carried away 3How vision makes sure that little fish do not get carried away 4Fear of the cuckoo mafia 2Fear of the cuckoo mafia 3Methane climate change risk suggested by proof of redox cycling of humic substances 2
... , Simon Fraser University virologist Masahiro Niikura and his doctoral ... that has discovered a new class of molecular compounds capable ... premise that too much of a good thing can be ... manipulating an enzyme that is key to how influenza replicates ...
... specialists at Florida Hospital Pepin Heart Institute and Dr. Kiran ... Florida announced they have enrolled their first patients into a ... of heart failure after ischemic injury. The therapy may ... to deploy more stem cells to the injury site. ...
... THAN SOUM, LAO PDR (February 21, 2012) The Wildlife ... endangered baby Siamese crocodiles into a local wetland in Lao ... The 19-month-old hatchlings, approximately 70 cm (27 inches) in length, ... at the Lao Zoo for eventual release into their native ...
Cached Biology News:Influenza study: Meet virus' new enemy 2New therapy for heart failure may enhance body's stem cell response at cardiovascular injury site 2New therapy for heart failure may enhance body's stem cell response at cardiovascular injury site 319 baby Siamese crocs released in Laos 2
(Date:1/15/2014)... Look inside the new Preferred Solutions® ... lab, from fluid handling to instruments to supplies. Many ... you order. , Preferred Solutions features a full ... L/S® model for precise flow control and dispensing to ...
(Date:1/15/2014)... This webinar will focus on EMA and ... in biosimilars. , Regulatory frameworks are evolving many countries ... the complex nature of biopharmaceuticals makes the demonstration of ... challenging. Based on the specific aspects of biosimilar drug ...
(Date:1/15/2014)... 15, 2014 The Microcompetition with Foreign DNA ... One of these latent viruses is the Epstein Barr Virus ... Rheumatoid arthritis (RA) is a chronic inflammatory disease that destroys ... found that RA patients have high concentrations of EBV DNA ...
(Date:1/15/2014)... Toronto, ON (PRWEB) January 15, 2014 ... an experimental new therapy for the treatment of tinnitus. ... unique tinnitus frequency, and over a period of weeks to ... Notched Sound Therapy in two forms: Notched Music and Notched ...
Breaking Biology Technology:Cole-Parmer Begins 2014 with the Release of Preferred Solutions 2Xtalks Life Sciences Webinar Examines Safety Assessment of Biosimilars 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 3
... ICLL) today announced that the Australian Therapeutic Goods,Administration ... to,prevent Japanese Encephalitis. This final decision step for ... Australian Drug Evaluation,Committee (ADEC) in December 2008. , ... Australian authorities represents the first,regulatory approval for the ...
... Aerolase Corporation, a leading manufacturer of next-generation portable ... sales increased dramatically in 2008 over 2007. The ... market helped to more than offset current economic ... record sales month for Aerolase, and 2008 overall ...
... Jan. 23 Peter T. Wilderotter, president and CEO ... following statement today in response to FDA clearance of ... is an exciting first step for Geron and for ... to advances in medical research. There has been so ...
Cached Biology Technology:Australian Authorities (TGA) First to Grant Final Product Approval for Intercell's Vaccine to Prevent Japanese Encephalitis 2Australian Authorities (TGA) First to Grant Final Product Approval for Intercell's Vaccine to Prevent Japanese Encephalitis 3Australian Authorities (TGA) First to Grant Final Product Approval for Intercell's Vaccine to Prevent Japanese Encephalitis 4Aerolase Reports Strong Sales in 2008 for Portable Aesthetic Lasers 2Aerolase Reports Strong Sales in 2008 for Portable Aesthetic Lasers 3Christopher and Dana Reeve Foundation Response to FDA Clearance of Geron's Clinical Trial 2
Rabbit polyclonal to Lck (phospho Y192) ( Abpromise for all tested applications). entrezGeneID: 3932 SwissProtID: P06239...
Goat polyclonal to Ephrin B2 ( Abpromise for all tested applications). entrezGeneID: 1948 SwissProtID: P52799...
Mouse monoclonal [RL13] to LAP1 ( Abpromise for all tested applications). SwissProtID: Q96NW7...
Sheep polyclonal to Malate Dehydrogenase ( Abpromise for all tested applications). Antigen: Full length protein - Pig heart malate dehydrogenase. Entrez Gene ID: 4190 Swiss Protein ID: P...
Biology Products: