Strong colonies repel, weak ones fall

The single biggest factor in whether a colony survives wasp season is not any trap or screen, it is how strong that colony already is. A populous hive with plenty of guard bees at the entrance turns wasps away as a matter of routine, the same defences that hold off robbing bees working just as well against a wasp scout.

A weak, small, or queenless colony is a different story: without enough guards to hold the line, wasps can wear a hive down and kill it outright over a period of days to a couple of weeks in a bad year. This is why equalising your apiary, giving a weak colony frames of bees or brood from a strong one, does more for wasp defence than any piece of equipment.