Development of an Advisory System for Grapevine Powdery Mildew in Eastern North America: A Reassessment of Epidemic Progress

Fig. 2. Temperature-based severity accumulations do not help explain fruit disease severity. Major differences in disease levels on fruit occur despite year-to-year similarities in temperature, expressed here in the form of severity accumulations.



Image from Plant Health Progress article:
Development of an Advisory System for Grapevine Powdery Mildew in Eastern North America: A Reassessment of Epidemic Progress