Blight Responsible for the Irish Potato Famine is Back

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Photo: Blight Potato - U.S. Department of Agriculture
Photo: Blight Potato - U.S. Department of Agriculture
On the anniversary of the start of the Great Famine in Ireland, the Late Blight that it caused rears its head in the USA. Can modern farmers defeat it now?

What a difference 166 years makes. In August 1845, a potato fungus called Phytophthora infestans was found in the crops of Irish farmers. It led to the most infamous famine in history. Over the next six years, 27.3 percent of the population of Ireland had been lost to starvation, epidemics, pandemics and emigration. On August 4, 2011, North Dakota State University Blightline announced that the same Late Blight had been discovered both there and in Minnesota. By August 26, 2011, they were able to announce that it was almost gone.

NDSU Announcement: No Additional Phytophthora in North Dakota

The North Dakota State University (NDSU) Blightline is sponsored by one of the largest potato growers in the region. Syngenta Crop Protection, based in Greensboro, North Carolina, was the first to tell the general public that the Late Blight had appeared amongst American crops. It had been reported previously, on July 26, 2011, to industry insiders by the newsletter of the Northern Plains Potato Growers Association. Phytophthora, a fungus that blackens potatoes, was found throughout west central and southern Minnesota, as well as eastern North Dakota.

The authorities were quick to act. Farmers were advised on the best fungicides and practices needed to combat the spread of the Late Blight. That course of action still holds current, as growers seek to contain and eradicate this crop infection. However, exactly one month since the alarm was sounded, there is good news.

The NDSU latest update, dated August 26, 2011, states, "No additional late blight has been reported in our region, but late blight continues to be present in some fields at low levels." But there was still caution against prematurely withdrawing from the fight against Phytophthora. "All growers should continue to apply protectant fungicides until vine kill to minimize tuber infection if rain develops around harvest time."

How the Late Blight Ravaged Ireland During the Potato Famine

In August 1845, Phytophthora infestans began to infest some of the potato crops in Ireland. Historians are divided upon its severity. Hoppen stated that a sixth of the overall national harvest was saved, with some areas of Ireland not affected at all. Jackson wrote that as much as 50 percent of the crops were untouched by the Late Blight. Unfortunately, without modern fungicides and immediate action, the situation could only worsen; and it did. In August 1846, there was a total crop failure.

By 1851, the Great Famine was effectively over. This was also the year of a national census, which revealed just how many Irish people had died of starvation and the other effects of the loss of the potato crops. 2.5 million is the official total, as calculated by census commissioners. But historian Cecil Woodham-Smith argued that this estimate was too low, noting that “vital statistics are unobtainable, no record was kept of deaths, and very many persons must have died and been buried unknown, as the fever victims died and were buried in west Cork, as bodies, found lying dead on the road, were buried in ditches, and as the timid people of Erris perished unrecorded.

The situation became so dire because potatoes had long been the staple diet for the majority of the Irish people. Much of the rest of Ireland's food produce was exported, primarily to England. This continued throughout the crisis, leading to the view that famine was just the manifestation of genocide against the Irish.

This was certainly the position of Prime Minister Robert Peel, who resigned his office in 1846, with an angry speech condemning his own ministers. He raged, "Good God, are you to sit in cabinet and consider and calculate how much diarrhea, and bloody flux, and dysentery a people can bear before it becomes necessary for you to provide them with food?" It was also the view of Tony Blair, prime minister of the United Kingdom from 1997 to 2007, who formally apologised to the Irish people in 1997.

The Legacy of the Irish for the Americans Today

Fortunately for the American people, their own authorities are much quicker off the mark with tackling modern outbreaks of the Late Blight. It was the experience of the Irish, over 150 years ago today, that helped provide scientists with the knowledge to defeat Phytophthora infestans. Six years of devastation now becomes just a few weeks of carefully regulated action that barely registers a bleep in the world's media.

Sources:

Jo Harrington, Georgia Langley

Jo Harrington - Jo has a BA (Hons) in History and Philosophy and a MA in History. She has a book published on the history of Wicca.

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Comments

Aug 29, 2011 8:45 AM
Guest :
As Syngenta seems to have had an interest in the crops mentioned, does this mean that the GM potatoes are now being targetet by the virus?
Aug 29, 2011 11:24 PM
Frieda Paton :
Having just read a novel dealing with the period of the Irish famine, but giving no background of what exactly blight is, this article filled in the gaps I had been wondering about.
Sep 10, 2011 6:15 AM
Guest :
THX that's a great asnewr!
Sep 13, 2011 4:09 AM
Jo Harrington :
Frieda - I'm glad that I was able to provide the historical detail for you. What was the book?

Guest - I'm working on finding an answer for you. My gut feeling is 'yes', but I want to be sure before I confirm it.
Sep 15, 2011 5:01 AM
Guest :
Regarding the question of GM potatoes being targeted by the virus: a modified potato variety is just as susceptible to the fungus that causes Late Blight unless it has specifically modified resistance to the fungus itself. The most common modifications are things like Bt resistant, or 'round-up ready' crops, and if potato crop of those sorts of varieties are being grown then it will be just as susceptible as a non-GM potato.

But regarding Late Blight resistant potatoes being targeted, the answer is no. As it is, the technology for Phytophthora resistant crops is still being developed. There are currently two available varieties, but both only have a single genetic line of resistance...which more or less means that if the conditions for the fungus to grow are good, or if the strain is particularly virulent, then the single resistance gene may not make a difference. Currently what is being developed is a variety of genetically modified Phytophthora-resistant potato using a mix of several different resistance genes, called Sapro-Mira...but this variety of potato is still being tested and is not yet available on the market.

It takes a good amount of fungicide to stop the Late Blight, and as was said in the article: "Farmers were advised on the best fungicides and practices needed to combat the spread of the Late Blight." Syngenta tells buyers they will keep them informed of conditions in which Late Blight will grow in so they can use fungicides as a preventative measure, and so with a break out they will want to inform their clients of the best ways to save their crops, which could be an explanation for their interest in the matter.

So...The short answer to the question however is that no Late Blight is not targeting fully Phytophtora resistant GM crops because the technology itself does not fully exist yet. And otherwise it does not make a difference if the potato is organic or GM they will be equally susceptible/targeted. :)
Sep 15, 2011 5:14 AM
Jo Harrington :
Thank you very much for a very detailed response!
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