Glyphosate: Controversy and Industry Impacts
Glyphosate, the original Roundup, is the most widely used agricultural chemical in the world. As a broad spectrum, nonselective, systemic herbicide, it has been used for weed control in many venues since its introduction in 1974: agricultural field crops, vegetable and fruit crops, aquatic weed control, nursery and landscape, and homeowner applications…among others.
In December 2025, a landmark, peer-reviewed publication originally published in 2000 in a toxicology journal was retracted due to possible ethical concerns. Allegedly, Monsanto scientists colluded with University scientists, even ghostwriting portions of a research paper, to possibly skew concerns over potential carcinogenic impacts on human health. This program will review some of the controversial aspects of Glyphosate and its future in our plant industry.
Dr. Dave Roberts
Dr. Roberts has researched many issues in Michigan’s plant industry, including Oak Wilt, Dutch Elm Disease, and Diplodia Tip Blight of Pines, along with a variety of cultural problems such as plant nutrition and herbicide toxicity. During his career, he has discovered a variety of new diseases and pests such as Phomopsis Canker of Spruce and the first bacterial wilt disease of turfgrasses in North America.
In the early 2000s, his research on Ash Decline in Southeast Michigan led to the discovery of the invasive Emerald Ash Borer in North America. In his retirement, Dr. Roberts intends to remain active with the Green Industry. Dr. Roberts is President, CEO and CBW (Chief Bottle Washer) of The Plant Doctor, LLC…aka the Tree Doctor.