"I was just out at 1 of my hives and a Bumble bee went into it. The girls got really upset and after 3 or 4 trys pulled it to the edge and down to the ground. After a few minutes the girls flew back up to hive and the bumble bee flew away. I was surprised he did not die.
Is the fact he was trying to get into the hive any indication of anything I should be looking at or for???"
vandy, a couple comments; was it a carpenter bee or a bumble? they look alike, but slight differences. i see more carpenter bees trying to invade my hives (one at a time) and typically the bees will take care of them, sometimes they are able to fly off, not usually. i think carpenter bees are frequently misidentified and confused with a bumble.
bumbles or carpenters are not a threat to your hives. just because you saw a bumble/carpenter bee trying to get in, is not cause for alarm. i typically see carpenter bees trying to sneak in all season long (not in droves, only one at a time, here and there). there is no need for your to be alarmed about a bumble or carpenter trying to get in, and no need to reduce entrances or other extreme measures to keep them out. the bees will take care of them.
the invasive species as apis and others have said are the yellow jackets, wasps or hornets.
mikey, iddee is correct, too small a screen will strip the pollen off the legs of the bees.