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Hi, I'm Amanda! My family farms corn and soybeans in Southwest Michigan. I'm also a practicing attorney.

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No Worries: GMOs and Earthworms Can (And Do!) Co-Exist

January 15, 2015

A reader brought to my attention the following meme she found being passed around on social media:

GMOInside Worm Meme

After doing a (very) little bit of digging, it was pretty easy to debunk this one as not true! As you can see from the meme, there is supposedly a new study showing that Round-Up, the active ingredient of which is glyphosate, kills earthworms. Of course, Round-Up is commonly used on fields with corn and soybeans that have been genetically modified to resist it. It allows us to kills the other plants in our fields that are competing with the crops for those precious resources. Lot’s of anti-GMO activists try to (unsuccessfully) link glyphosate with ill effects, such as killing earthworms.

So, let’s take a minute to debunk this one…

Let’s explore the obvious first: We have Earthworms in our fields. My family grows Round-Up Ready corn and soybeans. We have for years and years now. On any given day, especially when it’s rainy, you can go play in our dirt and find Earthworms. Just to be sure, I also confirmed with my brother (who does soil sampling for various farms in the area for work) and he also confirmed that there are Earthworms present in fields all around this area that have consistently and recently (as in the last planting season) sprayed with Round-Up.

So, right off the bat we know this graphic is false. We have been using Round-Up for quite a while now and there are plenty of slippery and slimy Earthworms crawling around in our fields. But what about the actual science?

Thankfully, there is a ton of scientific evidence available to show that Earthworms are NOT harmed by Round-Up.

First, let’s take a look at how Steven L. Levin, Ph.D. from Monsanto, who has worked in the field of ecotoxicology for 25 years, has to say about this very issue over at GMO Answers:

Monsanto has conducted several laboratory toxicity studies that demonstrate that glyphosate and the original Roundup herbicide are not harmful to earthworms at soil concentrations that greatly exceed levels expected by normal applications (Giesy et al., 2000). This testing was done with the earthworm species Eisenia foetida, which is a common surrogate and has shown comparable sensitivity to pesticides as other earthworms (Edwards and Bohlen, 1996). In these studies,

Roundup herbicide was incorporated uniformly into the soil to ensure exposure of the worms throughout the study. There was no mortality of earthworms observed at the highest test concentration of 5,000 parts per million (ppm and equivalent to mg/kg dry soil) of Roundup herbicide, and no adverse effect of any kind was seen at the level of 500 ppm. For comparison, glyphosate concentrations in soil immediately after application of a glyphosate herbicide are typically less than a few ppm in the top centimeters of soil and are dependent on the amount of herbicide intercepted by target plant material.

So, what Dr. Levin is saying is that even at very high concentrations – much higher than will ever show up in an actual field of Round-Up Ready crops – Earthworms are just fine. But, I know what you’re going to say – Dr. Levin works for Monsanto and so you can’t trust him.

But Dr. Levin also cites to Biology and Ecology of Earthworms by Edwards C.A. Bohlen P.J.ย As he explains in his response, this is to go-to book when it comes to finding out information about earthworms. In the book, the authors rank various chemicals for toxicity related to earthworms. 4 is the highest ranking and the most toxic. 0 is the lowest ranking and the least toxic. Glypohosate was given a 0 rating. That means it isn’t toxic to Earthworms.

We can also look at what the EPA has to say about this issue. As part of EPA testing prior to certifying a pesticide for commercial use, the EPA wants to know how the chemical is going to affect other parts of the environment, not just the plant being sprayed. It found: “Based on current data, EPA has determined that the effects of glyphosate on birds, mammals, fish and invertebrates are minimal.” (Source: EPA RED Sheet)

Interestingly enough, one study found that glyphosate actually makes the soil conditions more favorable to earthworms by removing other toxic things from the soil.

But what about the study cited by GMOInside?

Unfortunately, the study itself is behind a pay wall. That means if you want to read it and analyze it, you have to pay to do so. The link to the study is here. From the synopsis, it looks like only six earthworms were used in each group, which really seems to be a small amount considering the claims the study is attempting to make. Furthermore, according to others that have read the study (check out the GMO Skepti-Forum on Facebook if you’re interested…), the results of this study were statistically insignificant and weren’t even reported. But even if they had shown something, the great weight of scientific evidence shows us a different result. This study would be an outlier. It would certainly need to be repeated before it could confidentially make such claims.

Meanwhile, I’ll tell the Earthworms in our fields that you were worried about them.

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Filed Under: Uncategorized Tagged With: environment, EPA, farm meme, GMO, Monsanto, truth

Hi, I'm Amanda. My family farms corn and soybeans in Southwest Michigan. I'm an attorney and I'm passionate about agriculture!

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I'm Amanda. My family farms corn and soybeans in Southwest Michigan. I'm an attorney by day, and "agvocate" at night.

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Things I didn't miss while on vacation: โŒ watch Things I didn't miss while on vacation:

โŒ watching the news
โŒ hours scrolling on my phone
โŒ stress about creating new content
โŒ hours in front of the tv
โŒ worry about billable hours
โŒ always being connected
โŒ my to-do list

Isn't it funny how a good vacation can change your perspective? Hoping to keep a few of these things with me until my next adventure.
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We're on a family vacation in Florida this week. We hit SeaWorld, Universal Studios, Magic Kingdom, and Animal Kingdom. My highlight was spending some much-needed time with my favorite people. Headed home to Michigan soon. We're all hoping to bring back some warmer temperatures! ๐Ÿคž

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