We have two sour cherries trees. We picked our cherries today and, when we soaked them, discovered we worms in many of them. Our understanding is that the larva are from a fly that comes from the soil under the tree. Is there anything that can be done to prevent the flies from coming up next year and to prevent them from getting our other tree? Are there options that won’t harm beneficial insects like bees? I’ve read about different pesticides, putting down a barrier on the ground under the tree, using worm casings, etc….