For those of you interested in HopGuard, I just received notification from Mann Lake Ltd. that Section 18 approvals have been issued in Oregon, Washington and Idaho. Arkansas and Mississippi are supposed to be next.
HopGuard is a naturally occurring food-grade alternative to chemical pesticides. It has been found safe to use even in queen-breeding operations because it has no negative effect on egg laying.
For the record, I have no financial interest in either HopGuard or Mann Lake Ltd.