I'm in N California where the temperatures are unseasonally warm, 65 degrees day and 38 at night. The bees are flying, probably thinking its spring but there's no food available. I lost 1 strong hive and 2 weaker ones from robbing. I put robber screens on, probably too late, to save the other 5 hives and I closed them in for a week, but everyday robbers keep coming back looking all over the hives for a place to get in. I'm leary of opening the hives for fear of the robbers overtaking the remaining hives. The strong hives have honey and weaker ones are being fed with dry sugar and pollen patty. Any suggestions or comments?