By Carey Gillam – The Huffington Post, 6 January 2016
New research adds to evidence that the effectiveness of popular genetically engineered traits used to protect corn and cotton from insects is failing, putting U.S. corn production potential in jeopardy, and spurring a need for increased insecticide use.
The study, authored by a trio of independent researchers, documents resistance in a major crop pest called corn earworm, and adds to warnings that the popular GMO insect-resistant technology known as Bt, after the soil-dwelling bacteria Bacillus thuringiensis, has lost its luster. It is noteworthy as the first long-term, in-field assessment of transgenic Bt corn’s effectiveness against one of the most damaging pests of sweet corn, field corn, cotton and many other high-value crops. Before publishing their findings, which cover 20 years of observations, the researchers presented them to the Environmental Protection Agency (EPA) as well as to the corporations that developed and market the traits, said Galen Dively, a University of Maryland entomologist and lead researcher on the study.
Crops engineered with Bt genes express specific proteins known as (Cry proteins) that make the crops toxic to specific insects – the plants effectively provide their own insecticide – reducing the need for chemical applications. In 2015, more than 80 percent of the U.S. corn crop carried at least one Bt trait. Much of the corn now planted is engineered with multiple Bt Cry proteins, but the new research indicates that the insect (called earworm in corn but bollworm in cotton) is now able to survive multiple genetically engineered traits in a pyramided variety. Other research has shown wide failure of traits supposed to protect against the western corn rootworm as well, leaving farmers facing big and potentially costly problems as resistance builds, according to the researchers.
— Dr. Vandana Shiva (@drvandanashiva) January 8, 2017