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” associated with bunch rots. In addition, continue to be vigilant with downy mildew (DM) management through harvest. While grape berries should have acquired resistance to Powdery Mildew (PM), leaves (especially younger), remain susceptible.
Additional resources for general grape disease management:
Virginia Tech Grape Pest Management: https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/456/456-017/ENTO-337C.pdf
For a printable copy (pdf format) click on download document at the bottom of page.
Timely Viticulture is designed to give those in the Maryland grape industry a timely reminder on procedures or topics they should be considering in the vineyard. To view other topics you can go to the Timely Viticulture page that is located on the Grapes and Fruit website.