In recent years, the preservatives in treated wood have changed to 
eliminate the most noxious chemicals ans substitute safer ones

My question is this: are the new treated plywoods safe for contact with 
bees as it would be used in floors and lids?

Apparently the preservatives are now copper amine, Alkaline copper 
quaternary, copper azole, and/or Micronized copper technology
---
 From Wikipedia: http://en.wikipedia.org/wiki/Wood_preservation

Alkaline copper quaternary (ACQ) is a preservative made of copper, a 
fungicide, and a quaternary ammonium compound (quat) like didecyl 
dimethyl ammonium chloride, an insecticide which also augments the 
fungicidal treatment. ACQ has come into wide use in the USA, Europe, 
Japan and Australia following restrictions on CCA.[5] It's use is 
governed by national and international standards, which determine the 
volume of preservative uptake required for a specific timber end use.

Copper azole preservative (denoted as CA-B and CA-C under American Wood 
Protection Association/AWPA standards) is a major copper based wood 
preservative that has come into wide use in Canada, the USA, Europe, 
Japan and Australia following restrictions on CCA. Its use is governed 
by national and international standards, which determine the volume of 
preservative uptake required for a specific timber end use.

Copper azole is similar to ACQ with the difference being that the 
dissolved copper preservative is augmented by an azole co-biocide like 
Tebuconazole instead of the quat biocide used in ACQ.[6] The azole 
co-biocide yields a copper azole product that is effective at lower 
retentions than required for equivalent ACQ performance.

Micronized copper technolog: Particulate (micronised or dispersed) 
copper preservative technology has recently been introduced in the USA 
and Europe. In these systems, the copper is ground to micro sized 
particles and suspended in water rather than being dissolved in a 
chemical reaction as is the case with other copper products such as ACQ 
and Copper Azole. There are currently two particulate copper systems in 
production. One system uses a quat biocide system (known as MCQ) and is 
a take-off of ACQ. The other uses an azole biocide (known as MCA or 
uCA-C) and is a take-off of Copper Azole.

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