Bee ping.
We pay a courtesy call on all our neighbors within a half mile and politely ask them not to use Sevin. If they already have Sevin on hand, we buy them a less bee-toxic poison (and take them a nice jar of honey in the fall)!
Unlike the situation in the U.S., this kill-off in Germany was linked by time and place and chemical evidence to application of a particular pesticide.
I still think the U.S. die-off was a virus or other communicable disease, because our hive is very isolated with no other bees nearby and we have had no problems. Most of the die-off is occurring in commercial apiaries where there's a lot of drift from hive to hive and a lot of trucking to follow the crop blooms.
We’ve had a request for a Bee ping list.
Who wants it?
:-)