Bud rot is easy to detect on most plants.

Look for one or more leaves in the middle of the bud that have lost some color or are drooping slightly. If a slight tug detaches the leaves then look at the base of the stem (leaf stem). Mold as I have experienced it starts on the inside so dying leaves are the first sign. If the leaf looks like it died from the base of the stem out then you may have problems. If caught early removing the infected area or whole top should fix it.