Where did downy mildew originate, and when was it introduced to Europe?

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Multiple Choice

Where did downy mildew originate, and when was it introduced to Europe?

Explanation:
Downy mildew on grapevines originated in North America and was brought to Europe in the late 19th century, around the 1870s–1880s. The pathogen, Plasmopara viticola, spread when infected American grape plants were imported for cultivation, leading to widespread vineyard damage in Europe soon after. The other options don’t fit the historical record, which shows no Africa-based origin in the 1950s, no Asia-based origin in the 1900s, and no Europe-based origin in the 1700s.

Downy mildew on grapevines originated in North America and was brought to Europe in the late 19th century, around the 1870s–1880s. The pathogen, Plasmopara viticola, spread when infected American grape plants were imported for cultivation, leading to widespread vineyard damage in Europe soon after. The other options don’t fit the historical record, which shows no Africa-based origin in the 1950s, no Asia-based origin in the 1900s, and no Europe-based origin in the 1700s.

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