I have a climbing rose on the front of my house, for the last 12 years it has produced thick blooms and looks wonderful and I have done little to it other than water and prune. This year the blooms are sparse and the leaves have fallen off, they appear to be very sticky. I am unsure what to do, maybe a spray but which one?
If you can obtain a product called Bayer Tree and Shrub granules. Apply per the label directions for ornamental shrubs. The granules are a mix of fertilizer and a systemic that will typically take care of many pest issues. I would also recommend spraying the entire rosebush well with a fungicide called Green Cure, available on-line. Or a fungicide you can buy locally for roses or ornamental shrubs. Also try watering the rosebush with some water that has a product called Super Thrive mixed into the water. The super thrive is full of readily available nutrients that will help the rose deal with all stressors and shock. You can use such water mix to water in the Bayer granules mentioned about as well. Water the bush with the same fresh batch water mix the next 4 to 5 times she needs watering.