Monsanto's Roundup triggers over 40 plant diseases and endangers human and animal health

Don Huber spent 35 years as a plant pathologist at Purdue University and knows a lot about what causes green plants to turn yellow and die prematurely. He asked the seed dealer why the SDS was so severe in the one area of the field and not the other. “Did you plant something there last year that wasn’t planted in the rest of the field?” he asked. Sure enough, precisely where the severe SDS was, the dealer had grown alfalfa, which he later killed off at the end of the season by spraying a glyphosate-based herbicide (such as Roundup). The healthy part of the field, on the other hand, had been planted to sweet corn and hadn’t received glyphosate.

This was yet another confirmation that Roundup was triggering SDS. In many fields, the evidence is even more obvious. The disease was most severe at the ends of rows where the herbicide applicator looped back to make another pass (see photo). That’s where extra Roundup was applied.

Don’s a scientist; it takes more than a few photos for him to draw conclusions. But Don’s got more—lots more. For over 20 years, Don studied Roundup’s active ingredient glyphosate. He’s one of the world’s experts. And he can rattle off study after study that eliminate any doubt that glyphosate is contributing not only to the huge increase in SDS, but to the outbreak of numerous other diseases. (See selected reading list.)

Sudden Death Syndrome is more severe at the ends of rows, where Roundup dose is strongest. Photo by Amy Bandy.

Roundup: The perfect storm for plant disease

More than 30% of all herbicides sprayed anywhere contain glyphosate—the world’s bestselling weed killer. It was patented by Monsanto for use in their Roundup brand, which became more popular when they introduced “Roundup Ready” crops starting in 1996. These genetically modified (GM) plants, which now include soy, corn, cotton, canola, and sugar beets, have inserted genetic material from viruses and bacteria that allows the crops to withstand applications of normally deadly Roundup.

(Monsanto requires farmers who buy Roundup Ready seeds to only use the company’s Roundup brand of glyphosate. This has extended the company’s grip on the glyphosate market, even after its patent expired in 2000.)

The herbicide doesn’t destroy plants directly. It rather cooks up a unique perfect storm of conditions that revs up disease-causing organisms in the soil, and at the same time wipes out plant defenses against those diseases. The mechanisms are well-documented but rarely cited.

1.The glyphosate molecule grabs vital nutrients and doesn’t let them go. This process is called chelation and was actually the original property for which glyphosate was patented in 1964. It was only 10 years later that it was patented as an herbicide. When applied to crops, it deprives them of vital minerals necessary for healthy plant function—especially for resisting serious soilborne diseases. The importance of minerals for protecting against disease is well established. In fact, mineral availability was the single most important measurement used by several famous plant breeders to identify disease-resistant varieties.

1.Glyphosate annihilates beneficial soil organisms, such as Pseudomonas and Bacillus bacteria that live around the roots. Since they facilitate the uptake of plant nutrients and suppress disease-causing organisms, their untimely deaths means the plant gets even weaker and the pathogens even stronger.

1.The herbicide can interfere with photosynthesis, reduce water use efficiency, lower lignin , damage and shorten root systems, cause plants to release important sugars, and change soil pH—all of which can negatively affect crop health.

1.Glyphosate itself is slightly toxic to plants. It also breaks down slowly in soil to form another chemical called AMPA (aminomethylphosphonic acid) which is also toxic. But even the combined toxic effects of glyphosate and AMPA are not sufficient on their own to kill plants. It has been demonstrated numerous times since 1984

Glyphosate with sterile soil (A) only stunts plant growth. In normal soil (B), pathogens kill the plant. Control (C) shows normal growth.

that when glyphosate is applied in sterile soil, the plant may be slightly stunted, but it isn’t killed (see photo).

1.The actual plant assassins, according to Purdue weed scientists and others, are severe disease-causing organisms present in almost all soils. Glyphosate dramatically promotes these, which in turn overrun the weakened crops with deadly infections.
“This is the herbicidal mode of action of glyphosate,” says Don. “It increases susceptibility to disease, suppresses natural disease controls such as beneficial organisms, and promotes virulence of soilborne pathogens at the same time.” In fact, he points out that “If you apply certain fungicides to weeds, it destroys the herbicidal activity of glyphosate!”

By weakening plants and promoting disease, glyphosate opens the door for lots of problems in the field. According to Don, “There are more than 40 diseases of crop plants that are reported to increase with the use of glyphosate, and that number keeps growing as people recognize the association between glyphosate and disease.”

cont.