I have a sour cherry tree in my yard that bears a TON of fruit. A few years ago, all the cherries had tiny worms in them. A local nursery told me it was a specific fly that lived in the lawn and laid eggs when the fruit started to mature. So we spayed as instructed and had two good years with no problems. However, the last two years, the fruit is sort of rotting from the inside out, just before it ripens. It seems similar to the prior infestation, but there is nothing living inside, just brownish. Seems this year's harvest is lost, but I really would love to know how to prevent it next year. Anyone have an idea?