It's especially good against tomato early blight. It will be a welcomed addition to the fungicides labeled for use on cucurbits. This is especially true for powdery mildew because of widespread resistance to Bayleton and Benlate. Quadris has provided excellent control of this disease in field trials in NC and many other states. We have not seen good activity against downy mildew of cucurbits.
More field testing is currently underway.
Clearly azoxystrobin is an excellent fungicide. However, it should not be viewed as a cure-all material. The real danger in the introduction of new and effective fungicides is that they will be abused. Because they work well on certain diseases, many will assume that they work well on most or all diseases. This is a leap of faith that should not be taken until results from actual field trials are available.