How Phytophthora Infestans Affected the Irish Potato Famine

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This paper will discuss the significance of Phytophthora infestans in regards to the mid-nineteenth century Irish potato famine. Phytophthora infestans is an organism that infects potatoes as well as tomatoes and is the cause of the potato famine that invaded Ireland in 1845. The invasiveness and complexity of Phytophthora infestans was responsible for the spread and severity of the outbreak that resulted in mass emigration and death. Ultimately, Ireland was ill-prepared economically, socially and intellectually to control the Phytophthora infestans infestation of the mid-nineteenth century.
Phytophthora infestans, also known as P. infestans, is an oomycete and a host specific parasite (Shumann and D’Arcy, 2000). P. infestans primarily infects the plant tissue of potatoes and tomatoes, causing the plant to develop irregularly shaped lesions on the plant’s leaves. Potatoes infected with P. infestans develop large black lesions on the skin of the potato causing the potato to become slimy, soft and completely inedible. The damage that P. infestans inflicts on the potato was a huge problem in mid-nineteenth century Ireland because half of the country relied on the potato for sustenance (Mintz and McNeil, 2014). Many Irish peasants could not afford to rent many acres of land, thus the potato was the ideal crop because one acre of potatoes could support a family for a year (Mintz and McNeil, 2014). The arrival of P. infestans eliminated nearly half of Ireland’s food supply, causing nutritional deficiencies that led to other diseases like scurvy and death (Mintz and McNeil, 2014). Ireland’s dependency on the potato ultimately increased the severity of the Irish potato famine.
P. infestans easily reproduces and spreads under humid, cool a...

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...er of causalities and emigrants suggests that countries other than Ireland could never be prepared for the uncontrollability of P. infestans in the mid-nineteenth century.
The devastation that P. infestans caused mid-nineteenth century Ireland was too immense for Ireland to cope with. The invasiveness of P. infestans was responsible for mass emigration and death. The complexity and aggressiveness of P. infestans suggests that a potato blight of similar magnitude of Ireland would cause as much devastation if it occurred in modern society as research regarding P. infestans is new and emerges slowly. The potato blight not only exemplifies Ireland’s instability in 1845, but also exemplifies that a close relationship between science and history is important because the two areas of study allow for a diverse understanding of past environmental, medical and social issues.

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