There is strong evidence that herbicide use has indeed increased in GMO crops (corn, soybean, and cotton), much as the critics have suggested. However, the evidence also suggest that herbicide use has increased even faster in the non-GMO crops rice and wheat. This suggests that there is an overall trend for increasing herbicide use in all crops, irrespective of whether GMO varieties are available. It is even plausible, based on these data, that GMO crops have slowed the increase in herbicide use (though it is impossible to say for sure).
GUEST AUTHOR: Andrew Kniss
I’ve been asked quite a few times over the last several years about a “homemade” herbicide recipe that is floating around the web. Many of you have probably seen it posted to Facebook or Twitter or Pinterest, or on your favourite home gardening site. One of my favourite descriptions calls it a “magical, natural, weed killing potion.” The recipe is largely the same regardless of the source. There are a pretty wide variety of claims about its safety, effectiveness, and “naturalness” depending on the website. One site even says it is “an alternative to chemical weed killers.” [Spoiler: it contains chemicals.]