In Alberta where we farm, our growing season is approximately 100 days (give or take), depending on the weather. Everything we do is timed, very precise and done for a very particular reason. We start planting our crops in late-April/early-May, weather permitting of course. Due to our short growing season, among other reasons, we choose to use glyphosate to pre-harvest our wheat.
The Use of Glyphosate on Pre-harvest Wheat
One of the practices that is highly misunderstood is the application of glyphosate for pre-harvesting wheat. In layman’s terms, this simply means spraying our mature wheat crop with glyphosate before it’s ready to be harvested. Though glyphosate is not a true desiccant (a desiccant is applied for rapid dry down & early harvest), it is generally used for weed control and can aid in dry down of crops, but the effects take much longer. This is done with care, precise timing, it is backed by science and it is regulated and monitored.
It’s important to understand that we don’t just spray herbicides recklessly and certainly not needlessly. We aren’t going to spend money on expensive herbicides if we don’t need to; just think about that for a moment. As a business, which our farm is, we want to make a profit and not lose it. We see the accusation constantly that our crops are “drenched” and “doused” in glyphosate. I assure you, they are not.
Recommendations for Pre-Harvest Glyphosate Application
- Always follow the label recommendations
- Glyphosate should be applied when there is 30% or less moisture in the seed, when the seed is firm and with reasonable pressure your thumbnail will leave a dent in the seed.
- It is applied then so glyphosate will not be moved into the grain from the plant; growers are recommended to use the lowest appropriate recommended dose for their target use
- Never harvest earlier than recommended, usually 7 days minimum post-application
We have a Crop Protection Guide to use and according to it, pre-harvest glyphosate must be applied 7-14 days before harvest. If you apply too early it can potentially reduce yields and damage the quality. It’s also important to note that wheat is only 1 of 14 crops registered for pre-harvest glyphosate and there are other desiccants that are commonly used like Reglone, Heat and glufosinate on various crops.
Which “Studies” Say This is Bad?
The study that gets shared and starts misconceptions about glyphosate in farming stem from Stephanie Seneff, a very well known anti-GMO proponent, whom I’ve read about a lot in the last year. One of the reasons why my red flag goes up when Senneff’s name is behind research is that she’s a senior research scientist at the computer science and artificial intelligence lab at MIT with biophysics and electrical engineering degrees also from MIT. So why the research on pesticides from an electrical engineer/computer scientist? Truth be told, she and her colleague didn’t conduct any research at all.
Bloggers like Sarah Pope from The Healthy Home Economist, have a big misunderstanding about wheat and glyphosate. She states on her blog after reading Seneff’s paper: “When you expose wheat to a toxic chemical like glyphosate, it actually releases more seeds resulting in a slightly greater yield.” This is completely false. The yield of the crop is already determined because the wheat has stopped growing—their job is done, the plant is dead. When the plant isn’t green anymore, that means photosynthesis cannot occur or transport nutrients. Spraying glyphosate won’t magically create more kernels of wheat that late in the game to create higher yields, however weeds are still growing which can take away from yields for next year’s crop.
Does Glyphosate Harm Our Health?
Health Canada and the Canadian Food Inspection Agency (CFIA) sets and monitors maximum residue levels (MRLs) using scientific methodology far below the amount that could produce health problems. It is a very safe herbicide to use, even safer than vinegar as a herbicide. Caffeine is ten times more toxic than glyphosate! If accidentally consumed, glyphosate is excreted mostly unchanged in feces and urine, so it doesn’t stay in the body and accumulate. There have been no legitimate studies linking glyphosate to any human health ailments.
In Conclusion
As farmer Greg Peterson stated on his Facebook page: “It is quite frustrating as a farmer to be accused of providing anything but safe and healthy food. If we knew that we weren’t, we would change our methods.” I’m right there with him. It is so disheartening to see written that we grow “toxic wheat”. We take great pride in what we do for a living and part of that is being transparent and honest with all of you. I assure you, unless you have Celiac disease or a wheat allergy, the wheat we grow is not “toxic”.
My farmer tells me that this practice is being used more all the time and that it’s important to note that the product can be misused. This is a practice that is common for our growing area, but may not be used by all wheat farmers. Farmers are not perfect and there needs to be better communication of why you can’t spray too early such as loss in yield and increased MRLs. As I already mentioned, we are up against the calendar with our short growing season. For example, the wheat harvested in our video was graded as number 1 (the highest) before it snowed and was graded as number 3 because of the snow after. A difference of about $0.50 a bushel and about an 8% decrease in value in one snow storm.
So remember: if you ever have a question about farming, ask the farmers! I’m happy to direct you to an expert that can answer further questions.
For more information from people in agriculture, please see:
The Truth About Toxic Wheat by Prairie Californian
Long-Term Glyphosate Use Effect on Wheat by The Farmer’s Life
Wheat Farmers’ Response to Toxic Wheat by Ask the Farmers
Glyphosate use in wheat by Andrew Kniss
One of Glyphosate’s Most Valuable Uses by Mark Keating
References
Alberta Agriculture and Rural Development Crop Protection 2014
Alberta Agridulture and Rural Development Desiccation or Pre-Harvest Glyphosate Application: FAQ
Glyphosate Facts Clarification of Pre-harvest uses of glyphosate: The advantages, practices and monitoring of residue levels
Kniss, A. Salt, Vinegar, and Glyphosate
XiaoZhi Lim. Is glyphosate, used with some GM crops, dangerously toxic to humans?
Hall, E. Roundup and Gut Bacteria
National Pesticide Information Center. Glyphosate General Fact Sheet
National Pesticide Information Center Glyphosate Technical Fact Sheet
RealAgriculture.com Wheat School: Timing a Pre-Harvest Glyphosate Application Right
Ryan, C. The Dose Makes the Poison
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