http://www.slate.com/articles/health_and_science/science/2017/06/the_data_do_not_support_the_idea_that_neonics_hurt_bees.html 

"The health problems seemed to have little to do with pesticides. A
fungal infection ran roughshod over Hungary’s bees. In Britain, they
were decimated by the deadly and unrelenting Varroa destructor
mite—even the controls suffered losses 400 percent greater than the
national average. These catastrophic loss numbers suggest the field
experiments may have been poorly constructed—raising doubts about the
standard of research for the entire research project."

Red is harmful, dark green was beneficial, light green was "no effect compared to controls.