I have had severe robbing of 4 nucs and extending to one moderately strong hive (has 2 deeps, and drawing 1 medium). First, I reduced entrances; removed feeders (which were all internal-- frame, pale, etc.); then closed off entrances completely and moved offended hives across my 10 acre property.
One nuc and the 2 deep hive were still covered with bees trying to get in 2 days later. 2 nucs had settled down.
Last night I covered the nuc and the hive that had attempted robbers with wet sheets. This evening these were covered with bees that had gotten under the sheet and still there at 9 pm! Again these hives are completely closed off with hardware cloth. I smoked them off, rewet the sheets, and tucked corners in tightly around hives so bees couldn't get in.
Please help. Anything else you recommend besides moving more distance?