the last two years my azalea has been loaded with buds but they dry up on the branch, no blooms. What is wrong?
A late frost or freeze is the most likely culprit. Varieties of rhododendron and azalea differ greatly in their frost/freeze sensitivity, so other varieties may be unaffected. Other stressors such as improper pH, excess shade, or improper pruning could also be partially responsible for lack of bloom.
A fungal disease, such as botrytis might also cause flower buds to shrivel and never open. To prevent it, improve air circulation aroudn the azaleas.