When do you treat plum trees for worms?
For the past four years, we've had beautiful plums...and the worms love them. You cut into one and it is pretty much a mess inside. I was told I needed to spray my trees with something to deter the worms that get into the blooms, then into the fruit. My trees are blooming right now, so when would I need to treat them?
What is the best product to use for this?