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Wine grape > Powdery mildew
Why do Wine grape Leaves Get Powdery Mildew?
Wine grape, also known as European grape
Powdery mildew is a serious fungal disease affecting Wine grape, causing leaf distortion, reduced fruit quality, and occasionally vine death. The disease can impact yield and wine quality significantly if not managed properly.

Symptom Analysis

The first signs of infection on Wine grape are powdery, white patches on leaves, shoots, and, later in the season, on the fruit. As the disease progresses, the infected plant parts can become distorted and stunted.
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What Causes Powdery mildew Disease on Wine grape?

Pathogen
Erysiphe necator, a fungus found on all continents wherever viticulture is practiced.
Weather factors
Thrives in warm (60-80°F), humid climates and can survive winters on bark, buds, or fallen leaves.
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How to Treat Powdery mildew Disease on Wine grape?

Non pesticide
Removal: Prune and discard infected plant parts immediately upon detection.

Environment: Maintain good air circulation by proper spacing and pruning, which reduces humidity and fungal spore spread.
Pesticide
Spraying: Application of sulfur or lime-sulfur, both organic fungicides, can effectively control the disease.

Scheduled treatment: Regular treatment at 7-10 day intervals during the growing season hampers the disease spread.

How to Prevent Powdery mildew on Wine grape?

Quarantine
Isolate new plants before introducing them to the vineyard to ensure they are disease-free.
Regular inspection
Maintain routine checks, especially during humid weather conditions, for early disease detection.
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When is Powdery mildew Most Active Period on Wine grape?

Powdery mildew of Wine grape is most active during warm, dry periods with high relative humidity, typically from spring to early summer.

Infectivity

The disease propagates through airborne spores, making it easy to spread across Wine grape in a relatively short time.

Lethality

Untreated powdery mildew can significantly reduce Wine grape's yield quality and can sometimes even cause plant death.

FAQs on Wine Grape

How long does it take for powdery mildew to kill Wine grape?
If left untreated, powdery mildew can significantly weaken Wine grape over 1-3 growing seasons, potentially leading to death.
Can Wine grape recover from powdery mildew?
Yes, with early detection and proper treatment, Wine grape can recover from powdery mildew.
What time of the year is Wine grape most susceptible to powdery mildew?
Wine grape is most susceptible to powdery mildew from spring to early summer, during warm, humid weather.
Does powdery mildew affect the taste of wine made from Wine grape?
Yes, powdery mildew can affect the taste of wine by reducing the quality and sugar content of the grapes.
How can I prevent powdery mildew on Wine grape?
Practicing good hygiene, maintaining proper plant spacing for improved air circulation, and conducting regular vineyard checks can help prevent the disease.
Does powdery mildew spread from Wine grape to other plants?
Yes, the spores of the fungal pathogen causing powdery mildew can be windborne and infect other susceptible plants nearby.
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