When was powdery mildew introduced to Europe?

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Multiple Choice

When was powdery mildew introduced to Europe?

Explanation:
Powdery mildew on grapevines arrived in Europe through imported plant material from North America, and historical records show it beginning to appear in European vineyards in the mid-19th century. The 1840s to 1850s is when first notable outbreaks were documented, so this timing matches the mid-1800s best. The later options refer to periods after these initial introductions, while the 17th century is far too early for this pathogen’s documented arrival in Europe. That combination makes the mid-1800s the correct timeframe.

Powdery mildew on grapevines arrived in Europe through imported plant material from North America, and historical records show it beginning to appear in European vineyards in the mid-19th century. The 1840s to 1850s is when first notable outbreaks were documented, so this timing matches the mid-1800s best. The later options refer to periods after these initial introductions, while the 17th century is far too early for this pathogen’s documented arrival in Europe. That combination makes the mid-1800s the correct timeframe.

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