More than 60 studies have found that glyphosate, the main ingredient in Monsanto’s Roundup weed killer, can kill most types of pests, including butterflies, moths, termites, termite eggs, mites and grasshoppers.
But a new study suggests that the chemical is even more dangerous to the insect’s life cycle.
The researchers used a computer model to determine the toxicity of different pesticide formulations and found that Roundup kills insects more efficiently when combined with other pesticides.
The combined effects could cause an insect to be more susceptible to pesticide poisoning, the researchers say.
Glyphosate, which Monsanto is selling as a weed killer for crops and livestock, is used on crops to control weeds, including weeds that are harmful to livestock and humans.
The chemical was first developed in the 1930s and has been used for decades in the US.
The US Food and Drug Administration says the use of glyphosate in food crops has been banned since 1992, but the industry argues that it is widely used in agriculture, particularly for controlling weeds.
In a recent report, the EPA estimated that glyphosate has been implicated in over 500 cases of human and animal deaths and nearly 500,000 human illnesses.
The report said that about 90% of these cases were caused by non-Hodgkin’s lymphoma, a cancer that can occur when cells from the immune system attack and attack healthy cells.
The EPA has set standards for glyphosate’s safety, and the agency has also set new limits on the use, production and use of the chemical.
Gloria Tilton, a professor of plant sciences at Oregon State University, told Al Jazeera that the research was “a wake-up call for the US pesticide industry”.
“It’s really good news,” she said.
“There’s a lot of fear and a lot more lobbying and a whole lot of regulatory inertia that’s happening around this issue.”
“There is a lot at stake for the pesticide industry in this country.”
Tilton added that the new research shows that the herbicide is “more toxic to bees than we know”.
The researchers, led by Paul Sperling at Oregon University, tested a range of formulations of glyphosate.
They found that the combination of Roundup and other pesticides was more toxic to the bees than they were to the insects.
The team also tested different combinations of glyphosate with other herbicides.
They found that in combination, glyphosate was about 3,000 times more toxic than the glyphosate alone.
“When you combine glyphosate and two of the other herbicide formulations that have been tested, it’s more toxic,” said Sperlin.
Sperling and his colleagues concluded that the pesticide combination was more harmful to bees, and that the combined effect of glyphosate and other chemicals “is about twice as toxic as the combination alone”.
“When we combine it with other chemicals, it really does have a big impact on the bees,” he said.
Spermicide and insecticide use are two of many reasons why the US is one of the most pesticide-intensive countries in the world, according to the International Agency for Research on Cancer.
The IARC also has an extensive list of chemicals that have a “probable carcinogenicity” – meaning they have a high risk of causing cancer – and “likely carcinogen” status.
The research paper, published in the Proceedings of the National Academy of Sciences, looked at glyphosate in different combinations.
In addition to the study’s lead author, researchers also included a group of researchers from the US Environmental Protection Agency, which reviewed the literature to identify other chemicals.
The authors used a combination of the Roundup weedkiller and a combination that had been used in Australia for more than two decades, and a third, less well-studied, compound, called polybrominated diphenyl ethers.
The results were consistent with the literature, which has not yet found any evidence of harm from the use a combination like this, the authors wrote.
But it is important to note that the study did not look at the long-term toxicity of the chemicals, the study authors wrote, “and it is possible that the longer-term effects of these chemicals may not be as relevant to humans”.
In a statement, Monsanto said the study showed that the use in agriculture of the herbicides Roundup and Bt was safe.
“We have known for years that glyphosate is safe for the vast majority of plants, including insects, that have never been exposed to it.
We have also known that Roundup can kill many beneficial insects and mites,” Monsanto said.
“However, the current EPA data does not support this conclusion.
It is important that the public, regulators and agricultural stakeholders understand the full risks of these products before they are used in the field.”
The safety of these crops is not in question,” the company said.
Gly-2, as it is known, is not an active ingredient in many consumer