**The most commonly used # is x30, so in your case it is 136*30 =~4000 mites.
This can be way off depending on the amount of brood in the colony and whether
the colony is hygienic or not.

The commonly quoted # is about 3000-4000 mites for economic threshould (worked
out by Keith Delaplane in the Georgia/TN/SC area.  so in your case, you should
treat.

Zach Huang
www.msu.edu/~bees

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