University of Maryland Extension

disease management

Pre-Harvest Disease Management and Late Season Bunch Rots

Timely Viticulture Timeline-Pre-Harvest
Many vineyards are approaching or already within 30 days of the anticipated harvest date for early wine grape varieties. During this window, grape berries are becoming very susceptible to a variety of late-season rots, such as ripe rot, sour rot, Botrytis bunch rot, and other “secondary-fungi”...

Downy Mildew Management

Timely Viticulture Timeline Post Bloom
Downy mildew is now a year-long challenge for grape growers in the East. Downy mildew is often difficult to manage because it requires specific weather conditions to become a serious threat, but it can develop into an epidemic very quickly in favorable weather. Downy Mildew Basics The downy mildew...

Mid-Season Disease Management

Timely Viticulture Timeline-Mid-Season
At 3 to 4 weeks after bloom, the risks of black rot ( BR ), Phomopsis ( Ph ; including cane and leaf spot, and fruit rot), and powdery mildew ( PM ) are decreasing. Downy mildew (DM) will be the main threat. While most Botrytis bunch rot infections occur around bloom and fruit set, bunch closing...
Maintained by the IET Department of the College of Agriculture and Natural Resources. © 2021. Web Accessibility

University programs, activities, and facilities are available to all without regard to race, color, sex, gender identity or expression, sexual orientation, marital status, age, national origin, political affiliation, physical or mental disability, religion, protected veteran status, genetic information, personal appearance, or any other legally protected class. If you need a reasonable accommodation to participate in any event or activity, please contact your local University of Maryland Extension Office.