Insect develops resistance to Monsanto’s GM corn

By Caroline Scott-Thomas

- Last updated on GMT

Related tags: Gm

Insect develops resistance to Monsanto’s GM corn
Western corn rootworms have been consuming genetically modified (GM) crops that have been developed to be resistant to them, raising questions about the longevity of some GM traits, according to a study in the online journal PloS One.

The researchers, led by Aaron Gassman of the University of Iowa’s Department of Entomology, found​ that resistance to the natural insecticidal toxins derived from the bacterium Bacillus thuringiensis​ (Bt) – used in Monsanto’s GM corn – had developed in four Iowa fields. The insects’ resistance to the toxin developed after farmers had planted Bt corn on the same field three years in a row – a relatively rarely occurrence, as farmers tend to rotate crops more regularly.

Nevertheless, the researchers said that evidence of insect resistance could cut short the benefits of Bt maize, which include reductions in pesticide use and localized suppression of some key agricultural pests.

They wrote: “These results suggest that improvements in resistance management and a more integrated approach to the use of Bt crops may be necessary…Even with resistance management plans in place, sole reliance on Bt crops for management of agriculture pests will likely hasten the evolution of resistance in some cases, thereby diminishing the benefits that these crops provide.”

The researchers also found that it was possible for the insects to pass on Bt resistance to their offspring.

They said this is thought to be the first time an insect has developed resistance to a GM crop trait.

In response to the study, Monsanto said it was too early to tell whether there were implications for growers in the field.

The company said that farmers are still getting good results from the technology, and recommends that they rotate crops to include non-Bt varieties.

It said: “These products continue to perform very well for growers in 2011, providing the expected level of WCR [western corn rootworm] control on more than 99% of the acres planted with this technology. However, we take performance and efficacy of our products seriously, and we are collaborating with Dr. Gassmann to better understand his initial data and to determine if and how they impact our IPM [integrated pest management] recommendations to growers.”

Bt maize accounted for about 45 percent of the corn crop planted in the United States in 2009.

Related news

Show more

Related products

show more

Quinoa syrup, a refreshing option to rice syrup

Quinoa syrup, a refreshing option to rice syrup

Faravelli Inc, food ingredients distributor - North America | 24-Mar-2021 | Product Catalog

Quinoa syrup by Naturis is a 100% natural alternative to rice syrup, ideal for balanced vegan diets.

low in fructose
with lysine...

Snacking: Evolving from mobile to purposeful

Snacking: Evolving from mobile to purposeful

Cargill | 16-Mar-2021 | Technical / White Paper

With the rise of the snacking lifestyle, manufacturers rose to the task of offering options for on-the-go eating. Then came 2020, and consumer mobility...

Plant-based innovation with oats

Plant-based innovation with oats

Lantmännen Functional Foods | 09-Dec-2020 | Technical / White Paper

Plant-based foods, meat analogues, dairy alternatives and protein-enriched foods and beverages have never been more popular. In this white paper, we look...

Related suppliers

Follow us

Products

View more

Webinars