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

Fig. 1. Grapevine powdery mildew outbreaks in New York vary substantially from year to year. Fruit infection can range from complete loss (A) to very little disease in unsprayed vineyards (B). However, supposedly clean fruit may also be plagued with diffuse infection (inset), which can alter wine quality.



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