One thing I'm still trying to puzzle out is why the big difference in toxicity between the two crustaceans in the Sanchez-Bayo paper. If this stuff acts on a nervous system, what's so different? Both absolute level and time dependence are very different. One thought I had was either an absence or presence of another pathogen. The particularly strong time dependence is associated with the decay of the host immune system and the growth of pathogen organisms. You might expect very different results depending if pathogens are present or not. This kind of goes along with the very different results for toxicity from different researchers on bees, and also with the "outbreaks" of CCD that tend to happen. You might expect very different outcomes depending on exposure levels, pathogens, and time the bees need to live.