"They were all doing great the last time I looked..."

What does that mean?  Did you remove honey?  How many boxes?  How many frames of bees, brood?  What are your mite levels?

>Today I go out and fine 4 of my 8 hives with copious amounts of dead bees outside as well as in.  All bees are dead with a few odd wigglers... was it starvation in a drought/dearth OR herbicide contact/exposure??  

What about the other four?  Your answer is there.  

Why would four get sprayed, weakened, or killed by spray and not the other four.

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