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...
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