What I do is take an old plastic milk jug, put in 2 cups of water, 1 cup of apple cider vinegar, and 1 tablespoon of blue Dawn dishwashing liquid. Hang several in each tree, depending on size. A tree that is about 10 foot tall and 10 foot diameter spread I will hang 2 in, about midway high in the tree. You have to wait until the blossoms drop of or you will kill a lot of bees. The bigger the tree the more you need to hang I the tree. Take down in the fall and dispose of them. You also need to be diligent in raking up the fallen apples throughout the year. I generally will have less than 10% of my apples with any type of worms in them. Never have sprayed my apple trees for years. I use this in my Fireside, Reagent, and Honeycrisp trees.