A Practical Model for the Control of Grapevine Powdery Mildew in the Northeast Region 2006
Project Leaders: D. Gadoury, R. Seem, W. Wilcox, M. Moyer, New York State Agricultural Experiment Station, Geneva, NY
Abstract: Powdery mildew causes extensive losses at the farm level. Loss of the most highly-effective fungicides to resistance has caused a shift towards “soft” and/or organically-acceptable options. Maintaining control with innately less-effective materials will require near-perfect timing with respect to seasonal changes in host susceptibility and environmental conditions. Our objective was to begin the development of a forecasting system that will answer questions (identified by stakeholders themselves) that are commercially relevant to decisions made in disease management. In 2006, we found an important piece of the puzzle: the fungus may occasionally discharge nearly all of it's overwintering spores while the vines are still dormant. The next step will be to better forecast this phenomenon so we can to offer news of this significant event to grape growers.