Navigation Links
Scientists offer recommendations for delaying resistance to Bt corn in western corn rootworm
Date:11/26/2013

Corn that contains proteins that protect it from insect damage has been grown in the U.S. since the mid-1990s. Known as Bt corn, because the proteins are derived from a bacterium called Bacillus thuringiensis, these plants have been widely grown by farmers.

While Bt corn has been highly effective against the European corn borer, it has been less so against the western corn rootworm, which has been documented to show resistance to the Bt proteins. In a new article in the Journal of Integrated Pest Management -- an open-access, peer-reviewed, extension journal -- the authors explain why this has occurred, and they recommend an integrated pest management (IPM) approach to address it.

In "Resistance to Bt Corn by Western Corn Rootworm (Coleoptera: Chrysomelidae) in the U.S. Corn Belt," Drs. Aaron Gassmann (Iowa State University), Michael Gray (University of Illinois), Eileen Cullen (University of Wisconsin), and Bruce Hibbard (University of Missouri) examine why Bt corn has been more effective against the European corn borer, which tunnels in the stem of the plant, and less so against the rootworm, which attacks the roots.

First, Bt proteins intended for the European corn borer are produced at a higher dose than the ones intended for rootworms; this ensures that fewer corn borers are likely to survive, which lowers the chances of them producing offspring that may be resistant. Second, corn borer moths travel farther before mating, which increases the chances of potentially resistant insects mating with non-resistant ones that have not been exposed to Bt proteins; this lowers the chances of them producing resistant offspring. Finally, fitness costs -- or negative effects -- of resistance in rootworms appear to be low.

"One approach to IRM is not necessarily optimal for all insect pests," according to the authors, who recommend that growers use the following IPM approaches to delay further rootworm resistance to Bt corn:

  • Rotate to soybean or other crops to break the corn rootworm life cycle between growing seasons.

  • Occasionally rotate to a non-Bt corn hybrid and consider use of a rootworm soil insecticide during planting.

  • Consider using corn that contains different Bt proteins than ones that may have performed poorly in the past.

  • Consider using pyramided Bt hybrids, which is defined as corn that contains multiple Bt proteins targeting corn rootworm .

  • If crop rotation is not an option and corn containing multiple Bt proteins is not available, suppression of rootworm adults by using insecticides for one or two growing seasons may be an appropriate remediation step.

  • Most importantly, implement a long-term integrated approach to corn rootworm management, based on scouting information and knowledge of corn rootworm densities, that uses multiple tactics such as rotation with other crops, rotation of Bt proteins, and the use of soil insecticides at planting with a non-Bt hybrid. Integration of tactics across seasons is fundamental to prolonging the usefulness of any effective management strategy.


'/>"/>

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

Related biology news :

1. 5 IU scientists named AAAS Fellows for their notable contributions
2. University Of Massachusetts Medical School scientists re-imagine how genomes are assembled
3. Rice scientists ID new catalyst for cleanup of nitrites
4. Chinese scientists reveal the genomic enigma of desert poplar
5. Scientists capture redox moments in living cells
6. Scientists prove X-ray laser can solve protein structures from scratch
7. Scientists find brain region that helps you make up your mind
8. In plant photosynthesis, scientists see clues for improving solar energy cells
9. Scientists have been able to grow artificial skin using stem cells from the umbilical cord
10. Spanish scientists identify a new ancestral enzyme that facilitates DNA repair
11. UT Dallas computer scientists create 3-D technique
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/3/2017)...  Data captured by IsoCode, IsoPlexis Corporation,s ... statistically significant association between the potency of ... objective response of cancer patients post-treatment. The ... cancer patients will respond to CAR-T cell ... to improve both pre-infusion potency testing and cell ...
(Date:3/30/2017)... March 30, 2017 The research team of ... three-dimensional (3D) fingerprint identification by adopting ground breaking 3D fingerprint minutiae ... realm of speed and accuracy for use in identification, crime investigation, ... cost. ... A research ...
(Date:3/29/2017)... 2017  higi, the health IT company that operates ... America , today announced a Series B investment ... EveryMove. The new investment and acquisition accelerates higi,s strategy ... transform population health activities through the collection and workflow ... higi collects and secures data today on behalf of ...
Breaking Biology News(10 mins):
(Date:8/16/2017)... (PRWEB) , ... August 16, 2017 , ... ... changing into a different cell type. Many treatments for specific cancers, such as ... example of targeted treatment is androgen deprivation therapy for advanced prostate cancer. ...
(Date:8/16/2017)... ... August 16, 2017 , ... Today, 3Bar Biologics ... secured $2M in funding from an impressive group of investors, including Rev1 Ventures, ... Fund. With this investment, 3Bar is broadening availability of its groundbreaking offering that ...
(Date:8/16/2017)... 16, 2017  This year,s edition of the Inc. 5000 features a ... workforce solutions, has made the list for the third year in a ... fastest-growing private companies based on a set of quantitative metrics. In addition, ... fastest-growing companies in the Bay State . ... Inc. 5000 ...
(Date:8/15/2017)... , Aug. 15, 2017 After spending the past two ... with crowdsourced data collection, GeneFo now offers this platform to healthcare ... and amplifying support, adherence, and data collection vis a vis their ... mark the successful launch of this offer. ... GeneFo ...
Breaking Biology Technology: