It's a challenging area, looking at multiple chemical exposure for bees.
We look at that when you have a product that has, for example, two different pesticides in it. We would look at that together, because we know it's being applied together. There has been research, for example, that has shown that certain insecticides and fungicides increase toxicity when they're together. When that research is available, we're able to put protections on the pesticide labels, such as, “Don't tank mix these products together.”
Beyond that, we rely on work with our partners, such as Agriculture Canada and other researchers, to do the research to determine where these interactions might be happening.