Three days ago, I did a cutdown split. The new colony has the old queen, a lot of the stores, and most of the open brood. I restricted the entrance down to about 2" wide and left plenty of cracks for ventilation (not wide enough for bees to pass through).
The day following the split, I noticed some darker bees (from a neighboring hive) attempting to get in but they were turned away by the guard bees. Today I noticed some light golden-colored bees (which I believe are from the parent hive) buzzing and darting around the entrance then getting in without being challenged by the guards. I assume this is because the guards recognize them as being from the same original colony.
How can I stop the parent from robbing the split?
I also noted a few (less than 10) drone larvae (no worker) being discarded by the split; only drones no worker larvae. We did have a cool front come through that dropped the temp down to around 55 at night when it had been around 70. I am not particulary concerned but wanted insight from more experienced keepers.