Herbicide resistant weeds are not a Bee-l topic per se, but it does open a window into the world of evolution of resistance to pest control in general and bee pathogens in particular. 

Herbicides have provided farmers with unprecedented success in controlling weeds
over the last 65 years. Without herbicides the world would face a major reduction
in crop yields resulting in high food costs and food shortages ... It is clear from history 
that any consistent practice to control weeds year after year will result in directed evolution
towards their survival. The solution is to vary weed control practices and destabilize evolution.

Ian Heap (2014) Herbicide Resistant Weeds

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