Severe Botrytis is affecting grapevine skins. Many vineyards remaining to be picked have 'slippery skins.' These slippery skins are caused by internal Botrytis infections, aided by the disease's enzymes.
Botrytis produces enzymes that breaks down berry skins (left).
Many vineyards are reporting fruit falling off in front of the harvester because of this type of Botrytis infection. Unfortunately their is little that can be done to save fruit once high levels of botrytis breaks down the berry skin.