How to Make a Robber Screen

Robbing can happen any time, but is more typical if there is a dearth of nectar and in late summer/early fall as the yellow jackets become more aggressive due to reduction of their brood nest. Either way it can knock out a colony pretty quickly and needs to be stopped. This project can be as simple or complex as you'd like it to be but the main idea is to reduce the entrance and confuse the robbers.