Every Hummingbird friendly gardener that uses insecticides or pesticides on flowering plants should be aware of the possible dangers to the hummers.
I don't allow any in my yard but I even have misgivings about the possible affects of soap sprays, which I use.
Lisa Tells studies may be of interest but I'm not sure what else her study has provided other than the "presence of insecticides".
It would be nice if the study provided some in depth range of values observed and if they fall in the range of values of concern.
I wouldn't make much of her study but wonder how she found "internal" evidence? Was an necropsy performed?
We have learned over the years that insecticides can be harmful to just about every living organism but Lisa Tells study does not show that it is harmful to hummingbirds. Before I get too upset and agitated I would suggest we get more information and refrain from using insecticides anywhere in the areas that our hummers frequent, especially their favorite flowers!