January 27, 2014 update: Recently, BetaTec (the manufacturer of HopGuard) has reformulated the strip to better treat for Varroa mites. The new strip is corrugated and has a mylar backing to help with many of the application issues identified in the field.
The Washington State Department of Agriculture has applied for a modification to the currently approved Section 18 to accommodate this improvement to HopGuard. The improved product is called HopGuard II. See the links below to look at the supporting documentation for this change.
14-WA-01 EPA Section 18 (PDF)