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Knocking Down Rot On Grapes

TroubleShooting

Morris Carmiche — lThousand Oaks, California asks,
Q

What do you do when your fruit comes in with signs of rot from an unusually wet season?

A
That’s a great question as we approach the harvest season. Though I don’t expect 2019 harvest to be like 2011 or 1998, many of us all over the country, from Oregon to Pennsylvania, will have to deal with some kind of rot or Botrytis close to harvest time. When I’m potentially faced with it, I get my special cellar treatments ready to go. The below is an anti-Botrytis and rot protocol that I’ve used when Botrytis or rot is what I’d call “medium”, i.e. about 10–20% of clusters seem to be affected. In a situation like that you can usually pick, treat the must or juice, and salvage some good wine out of it. However, if you are buying the grapes, review your contract and parameters for rejecting fruit from growers. My anti-Botrytis protocol: Reds and whites: Add a higher dose of SO2 at destemming or in the picking bins in the field (I recommend 50–70 ppm total SO2 addition). Whites only (assumes you’re destemming and pressing or just direct-pressing white grapes): Also add 0.20 g/L Lysozyme or Lactizyme mixed
Response by Alison Crowe.