>>Depends on the disease. I used Clorox solution last year on nosema ceranae
spores but I had deadouts this spring with high spore counts in many of 
those same boxes so I am going to fumigate with acetic acid ( like used in Europe) this spring.
Would you still treat if the beeless frames had been through a cold winter.  Someone, Randy I seem to recall, mentioned the cold kills the spores though I am not sure how cold and for how long is needed.
>>A slight warp can * at times * be reused. I have too burn barrels outside my
shop and I burn warped plastic foundation and there is little left.
I once leaned a couple of Pierco frames against a hive for the bees to clean up and did not take them out of the sun in time.  They warped.  Anyone have a tried method to unwarp plastic frames.  I thought about clamping them down against a sheet of plywood and softening the plastic up to unwarp in the sun this summer...
Waldemar
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