Mix about 2 teaspoons of crisco with all the powdered sugar you can get it to hold and make a patty about 1/4 in. thick.. Place it on the top bars. We are supposed to have flying weather for the next week, so they should be able to consume it in that time. If you have tracheal mites, it should help. If not, it won't hurt them. Powdered sugar doesn't hurt them in small amounts in flying weather.