The very popular pesticide Roundup (glyphosate) is getting a lot of press right now. The most recent verdict in California awarded a couple 2 billion dollars because the jury determined that Roundup caused their cancer (non-hodgkins lymphoma). This article explains that glyphosate is regularly sprayed on crops from a few days to 2 weeks before harvest. Because glyphosate kills the crop it speeds up the drying of it so harvest can be done sooner and there are less weeds in the way. Unfortunately for us, this chemical has been found to cause cancer and is an endocrine disruptor. Here is a quote directly from the article by Ken Roseboro titled Why is glyphosate sprayed on crops right before harvest.
“Along with wheat and oats, glyphosate is used to desiccate a wide range of other crops including lentils, peas, non-GMO soybeans, corn, flax, rye, triticale, buckwheat, millet, canola, sugar beets and potatoes. Sunflowers may also be treated pre-harvest with glyphosate, according to the National Sunflower Association.” - Ken Roseboro EcoWatch
If you want to avoid eating roundup, limiting your consumption of conventionally grown versions of the above foods will help.