Addressing the Gaps in our Knowledge of Grapevine Downy Mildew for Improved Forecasting and Management

Fig. 5. Symptoms and signs of downy mildew on infected clusters. (A) Sporulation on pedicels of clusters inoculated at 1 week postbloom. (B) Berries on sporulating pedicels develop discoloration. (C) Sporulation from artificial slits in berry surface. A and C reprinted with permission from Kennelly, M. M., Gadoury, D. M., Wilcox,W. F., Magarey, P. A., and Seem, R. C. 2005. Seasonal development of ontogenic resistance to downy mildew in grape berries and rachises. Phytopathology 95:1445-1452.



Image from Plant Health Progress article:
Addressing the Gaps in our Knowledge of Grapevine Downy Mildew for Improved Forecasting and Management