Diseases are typically designated with appellations that reflect the primary diagnostic sign, such as scab, rot, canker, leaf spot, wilt, blotch, in conjunction with the common name of the host and on occasion, the generic name of the pathogen, for instance, apple scab, wheat brown rust, plum bacterial canker, strawberry verticillium wilt. However, when a specific species or genus of pathogens triggers similar maladies in various hosts, the common name applied to some is often extended to others with minimal attention to descriptive precision. Therefore, as vascular infections instigated by Verticillium spp. frequently give rise to leaf wilting, a vascular condition of “X” caused by Verticillium is invariably referred to as “X wilt,” even if the host is one in which wilting is an unusual symptom. Nonetheless, the designations “downy mildew” and “powdery mildew” may be suitably employed to refer to the majority of diseases caused by specific genera of the Peronosporales and Erysiphales, respectively.