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Understand Grape Disease Pressure for Better Yield

June 23, 2020
This agronomic image shows botrytis in grapes

Syngenta, 2018: Botrytis in a CA vineyard.

Grapes face season-long disease pressure. It’s important to know what can affect your crop; your marketable yield is impacted by vine health, berry size and quality.

Diseases like Botrytis and powdery mildew can affect your fruit health and yield. Botrytis overwinters in the vineyard, infects flowers in spring when there is frequent rain and warmth, and goes dormant until late in the season when sugar concentration is higher. The fungus grows and spreads through the berry, causing the skin to split and releasing spores to infect nearby berries, reducing marketable yield potential. Powdery mildew damages leaves, affecting the plant’s ability to photosynthesize, which can reduce size and flavor.

Disease resistance in vineyards is an important factor to consider when creating a management plan. While the importance of managing disease for marketability can be critical in table grapes since they are judged on appearance, keeping vineyards free of disease is key in promoting vine health. If you get behind and allow disease to get a foothold, there’s no amount of product you can apply to recoup the loss.

The key to good control is using fungicides with multiple sites of action. Adepidyn® technology provides control against powdery mildew, while fludioxonil is effective on controlling Botrytis. When combined in Miravis® Prime fungicide, it becomes the best combination of active ingredients for control of grape diseases, remaining stable on the leaf surface for even distribution and protection.

Grapes treated with Miravis Prime show less diseased fruit, leading to higher marketable yield potential.

For more insight into grape disease management, contact your Syngenta representative.

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