I have seen SHB in Northern Illinois. However, the hive I seen it in was made from bees brought back from almonds.
I was wondering, what's the farthest north you guys have seen SHB from bees that were overwintered in the north and no new hives being introduced to the yard.
For example, if I overwinter 3 hives, and move a fourth hive to the yard in the spring that was from, say, Florida, I would expect to see SHB that summer. If all four hives are overwintered, and no new hive was introduced in the spring, I would hope to see no SHB the next year.
I was wondering if a lot of northern beeks who have SHB problems, have them because of where their bees have been, and not because of SHB existing naturally in the area.
Those who say "I have SHB and am from up North" may have the problem because they keep bringing in bees from the south.