I live in Indianapolis which I believe is zone 5. I have several hydrangeas, roses, and other bushes in my front yard. This is the 2nd year I've had a problem with holes in the leaves and browning. I have tried insecticides and fungicides. Tried a beer trap to catch slugs. Ive gone out at night with a flashlight and never see any insects. Any ideas? Whatever it is its affecting all my landscaping.