Every year most of the pears I harvest have damage from plum curculio (this appears as a dimple in the fruit with a hard growth of sclerenchyma cells). This makes the fruit much harder to process and results in a large loss of useable fruit. What is the best way for me to treat my two pear trees to prevent this loss? They are good sized (20 and 30 feet tall) and I am open to both organic and conventional control methods. Thank you! By the way, I am quite certain that the culprit is plum curculio as I have done the Master Gardener course work and have a strong horticultural background. Also, pears in Minnesota have few insect pests, and this one causes very distinctive damage.