What arrived to ireland in 1845? how did this impact the crops?

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The Irish Potato Famine, also known as the Great Hunger, began in 1845 when a fungus-like organism called Phytophthora infestans (or P. infestans) spread rapidly throughout Ireland. The infestation ruined up to one-half of the potato crop that year, and about three-quarters of the crop over the next seven years

Explanation:

answer; fair labor and standard act;