The detected residue levels are tiny, about 100-1000x lower than the established already conservative levels.
Here’s a comment I made regarding oats. Summary - it’s nothing to worry about.
Pesticides generally don’t pose a health risk to consumers. Most of the pesticides you eat are compounds produced by the plant you’re eating - it’s their immune system.
Dietary pesticides (99.99% all natural):
>We calculate that 99.99% (by weight) of the pesticides in the American diet are chemicals that plants produce to defend themselves. Only 52 natural pesticides have been tested in high-dose animal cancer tests, and about half (27) are rodent carcinogens; these 27 are shown to be present in many common foods. We conclude that natural and synthetic chemicals are equally likely to be positive in animal cancer tests. We also conclude that at the low doses of most human exposures the comparative hazards of synthetic pesticide residues are insignificant.
Levels of pesticide residues on consumer food are extremely low.
>All pesticide exposure estimates were well below established chronic reference doses (RfDs). Only one of the 120 exposure estimates exceeded 1% of the RfD (methamidophos on bell peppers at 2% of the RfD), and only seven exposure estimates (5.8 percent) exceeded 0.1% of the RfD. Three quarters of the pesticide/commodity combinations demonstrated exposure estimates below 0.01% of the RfD (corresponding to exposures one million times below chronic No Observable Adverse Effect Levels from animal toxicology studies), and 40.8% had exposure estimates below 0.001% of the RfD.
Farmers have been switching to the safest and least toxic pesticides.
Long-term trends in the intensity and relative toxicity of herbicide use:
>Although GE crops have been previously implicated in increasing herbicide use, herbicide increases were more rapid in non-GE crops. Even as herbicide use increased, chronic toxicity associated with herbicide use decreased in two out of six crops, while acute toxicity decreased in four out of six crops. In the final year for which data were available (2014 or 2015), glyphosate accounted for 26% of maize, 43% of soybean and 45% of cotton herbicide applications. However, due to relatively low chronic toxicity, glyphosate contributed only 0.1, 0.3 and 3.5% of the chronic toxicity hazard in those crops, respectively.
Glyphosate in particular is practically nontoxic to humans.
I am an Agronomist in North Dakota. Here glyphosate is not labeled for pre harvest dessication of Oat. It can, and is often used for killing weeds before crop emergence. Glyphosate is labeled for pre harvest dessication of lentils and I while I do not monitor any lentil fields I would guess that it is used regularly to facilitate harvest efficiency. By label a farmer must wait 7 days after spraying glyphosate to harvest lentils and since plants killed with glyphosate are slow to dry down I think harvest probably occurs more like 10-14 days after application with good weather.
In either of these two crops glyphosate cannot be used during the growing season since it would kill oats or lentils.