Earth Eats: Real Food, Green Living

Corn Crops Fall Prey To Resistant Bug

Bad news for Midwest corn growers -- a new study has found some pests have developed an immunity to Monsanto's genetically-altered corn seeds.

rootworm

Photo: Ian Marsman (Flickr)

The corn rootworm had been kept under control by rotating crops until a combination of economic factors and genetically-modified seeds made it easier and profitable to grow corn every year on the same land.

Bad news for Midwest corn growers — a new study has found some pests have developed an immunity to Monsanto’s genetically-altered corn seeds.

In a study by Iowa State entomologist Aaron Gassman, western corn rootworms have developed a resistance to Monsanto’s altered plants. The corn plants had been grown with seeds designed to resist the bug by releasing a gene that destroyed the rootworm but was harmless to animals and most other insects.

This is the first time a Midwest bug has evolved to resist a genetically altered crop.

So far the sample of resistant corn that is being harmed by the rootworm is small, only “four northeast Iowa fields have evolved,” Gassmann found.

“These are isolated cases, and it isn’t clear how widespread the problem will become. But it is an early warning that management practices need to change,” Gassmann said.

Monsanto shares fell with the news Monday. The company responded to Gassmann’s findings by stating the seeds were working “on more than 99% of the acres planted with this technology.”

Corn growers could opt to use competitor’s seeds and spray with harsher pesticide to fight the resistant insects.

Read More:

Liz Leslie

Liz Leslie is a journalist based in Bloomington, Indiana. When she's not writing about food, she's likely eating food. Or dreaming about food.

View all posts by this author »

What is RSS? RSS makes it possible to subscribe to a website's updates instead of visiting it by delivering new posts to your RSS reader automatically. Choose to receive some or all of the updates from Earth Eats:

Support For Indiana Public Media Comes From

About Earth Eats

Search Earth Eats

Earth Eats on Twitter

Earth Eats on Flickr

Harvest Public Media