How does the use of modern potatoes overcome famines like the Great Irish Famine?

The government could have prevented Irish wheat and barley from being exported once it was clear that the potato crop had failed. ... They were closed down even though the potato crop failed again in 1847. 3. The government introduced a series of public works to enable the poor to earn money to buy food. Also BBC News reports a research team led by The Sainsbury Laboratory in Norwich, England, used dried leaf cuttings — some of which are nearly 170 years old — to reconstruct the spread of the HERB-1 strain of Phytophthora infestans, a fungal disease that came to Ireland via Mexico in 1845.

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