Phased-out Bt corn variety dramatically cut growth rate of black swallowtail caterpillars

than other varieties and has been linked to a reduced survival of monarchs at concentrations naturally occurring in and near cornfields. (Registration of event 176 expires this year and renewal is not expected, the authors noted. Less than 1 percent of U.S. corn acreage in 2000 contained event 176.)

Researchers put 20 potted parsnip plants and 25 potted milkweeds at intervals ranging from one-half meter to 7 meters from the corn when it began shedding pollen in late July. Pollen levels were monitored. Black swallowtails were released to feed on the parsnip and the monarchs on the milkweed, which attracted more predators.

The disappearance of monarch larvae was rapid over the next six days, but the disappearance was not affected by proximity to the crop, Zangerl said. The death rate was lower among black swallowtails and again unaffected by proximity. However, he said, the growth rate of the swallowtails varied dramatically; larvae 7 meters from the corn were three times as large as the larvae located one-half meter away from the corn.

UI researchers last year had reported high death rates of black swallowtail larvae fed high concentrations of event 176-containing corn pollen in laboratory tests. The new study shows that much lower levels can cause significant mortality in the laboratory.

The earlier study also noted that a widely used Bt corn variety containing Monsanto event 810 had no adverse affect on black swallowtails living in weeds near cornfields (see http://www.news.uiuc.edu/news/00/0605btcorn.html).

Results of this new study tell us again that careful event selection by producers is advisable, Berenbaum said. Our findings also suggest that much more research is needed on each new Bt variety to make sure non-target species will not be adversely affected once it is planted in the field.


Contact: Jim Barlow
University of Illinois at Urbana-Champaign

Page: 1 2

Related biology news :

1. Gene chips research in cotton could lead to superior variety
2. Single isolated mouse skin cell can generate into variety of epidermal tissues
3. New findings implicate cell size controls in a variety of diseases
4. Stem cells isolated from monkey eggs continue producing variety of other cells
5. Biosensor research expands globally to reach a variety of key industries
6. Retroviruses shows that human-specific variety developed when humans, chimps diverged
7. Small, slow growing urchin variety could affect commercial harvest
8. Wildlife variety is the spice of life, say scientists
9. New peach variety has strange shape and sweet taste
10. Researchers description of the regulation of a new family of ion channels may open doors for therapies for a variety of conditions
11. New grain variety opens up possibilities for Australian farmers

Post Your Comments:

(Date:6/25/2020)... MANSFIELD, Mass. (PRWEB) , ... June 24, 2020 ... ... provider of cloud-based enterprise software and software-driven clinical data services that accelerate drug ... trials for low-dose selinexor, an XPO1 inhibitor, in hospitalized patients with severe COVID-19. ...
(Date:6/23/2020)... ... June 23, 2020 , ... First ... Renovagen Ltd, a UK supplier and manufacturer of innovative portable renewable energy equipment, ... in the fight against the COVID-19 pandemic in Zambia. , One of Renovagen’s ...
(Date:6/23/2020)... THE WOODLNDS, Texas (PRWEB) , ... June 23, ... ... in X-ray analytical instrumentation, is pleased to announce the next event in a ... of X-ray scattering. , The TOPIQ series of webinars was developed in response ...
Breaking Biology News(10 mins):
(Date:7/18/2020)... ... July 16, 2020 , ... ... aid in the early detection and prevention of high-burden diseases, and Centric Consulting, ... hospitals and healthcare organizations to utilize existing data in order to identify and ...
(Date:7/10/2020)... ... 2020 , ... In most research using the zebrafish model, ... in zebrafish embryos, maintaining optical transparency to facilitate microscopic imaging. Over the past ... the zebrafish model to investigate the causes of leukaemia and its relationship with ...
(Date:7/1/2020)... ... June 29, 2020 , ... ... date growth of 40% in 2020, despite many obstacles created as a result ... to increase revenue for its partnered medical practices and medical manufacturers by expanding ...
(Date:6/28/2020)... (PRWEB) , ... June 25, 2020 , ... ... are racing to develop a vaccine or drug treatment. In an effort to ... has publicly released the world’s largest imaging dataset portraying therapeutic compound effects ...
Breaking Biology Technology:
Cached News: