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Volume 5 • Issue 11 • September 18, 2020
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Berry Splitting in Grapes, Should You Harvest?

Last week, as we were making progress towards a potentially great grape harvest at the West Madison Ag Research Station (WMARS), we got over 3 inches of rains during 3 consecutive days. All that rain resulted in a significant number of berries splitting, So, the big question was do we go ahead and harvest, even though we did not have the fruit maturity levels we desired, or we postpone to gain more °Brix and hope berries will not decay?  This is no easy decision and I wanted to share with you our decision-making process.

Berry Splitting and Insect Pests: Wasps in Numbers and Other Insects To Consider

At this time, social wasps, multicolored Asian ladybeetles, and Drosophila flies are likely present in your vineyards looking for sugar sources to feed on or lay eggs in. These insects are primarily known to attack previously damaged grape berries and, with the berry splitting you may have experienced last week following the rain events, these insects will likely be feasting on grapes more intensely for the upcoming weeks. Read more here.

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Editors: Josie Russo, Amaya Atucha, and Christelle Guédot

References to products in this publication are for your convenience and are not an endorsement of one product over similar products. You are responsible for using pesticides according to the manufacturer's current label directions. Follow directions exactly to protect the environment and people from pesticide exposure. Failure to do so violates the law.

Wisconsin Fruit Team Contact

Amaya Atucha
Extension Fruit Crop Specialist

Jed Colquhoun
Extension Fruit Crops Weed Scientist

Christelle Guédot
Extension Fruit Crops Entomologist

Josie Russo
Communication Specialist

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