Evidence: well sourced. Imported from the supplied 65-Case Master Edition, dated September 19, 2026. Source links and classifications are retained as an attributed case account; import is not an independent source review.
Case at a glance
- Case number
- 063
- Date / range
- 1840s–1850s
- Sector
- Genetic resources, agriculture, and biodiversity
- Genetic asset
- Potato crops and a dependent food system
- Security principle
- Diversity Is a Security Control
Event summary
Low crop diversity contributed to the vulnerability of Ireland's potato-dependent food system when late blight arrived, but the resulting famine was also shaped by political, economic, land-tenure, and relief failures.
Source: evolution.berkeley.edu — The Irish Potato Famine And Crop Uniformity source 1.
Source: pmc.ncbi.nlm.nih.gov — The Irish Potato Famine And Crop Uniformity source 2.
The case in context
Late blight struck a food system whose vulnerability extended beyond the crop itself. Diversity and crop dependence belong in the account, but political, economic, land-tenure, and relief failures shaped the human catastrophe. A biological explanation alone is inadequate.
The security lesson therefore joins agricultural resilience with the conditions that turn harvest loss into hunger. Varietal diversity can reduce one dependency; it does not replace access to food, effective relief, or social protection. The case is a warning against explaining a humanitarian disaster through a single genetic variable.
Acquisition and processing
narrow crop base + dependency → pathogen arrival → repeated harvest loss → policy/economic failure → humanitarian catastrophe
The sequence of events
- narrow crop base + dependency
- pathogen arrival
- repeated harvest loss
- policy/economic failure
- humanitarian catastrophe
What became inferable or exposed
Potato crops and a dependent food system
Low crop diversity contributed to the vulnerability of Ireland's potato-dependent food system when late blight arrived, but the resulting famine was also shaped by political, economic, land-tenure, and relief failures.
Affected parties and consent
- Direct parties
- People affected by crop failure and famine
- Indirect parties
- Connected institutions, communities, or resource users; no affected-person total is assigned.
- Direct count
- Unknown / not assigned
- Indirect count
- Unknown / not assigned
- Consent status
- Access, stewardship, breeding, and benefit-sharing arrangements depend on the collection and setting. These are not necessarily individual privacy questions.
Security dimensions
Confidentiality
The confidentiality question concerns potato crops and a dependent food system. Exposure and further inference must be distinguished from the fact of collection or availability.
Integrity
The integrity question is whether the described material, permissions, processing, or interpretation can be relied upon. Diversity Is a Security Control identifies the particular boundary examined here.
Availability
Access and continuity are assessed for the described event; potential effects are not presented as confirmed outages or losses.
Provenance
The relevant chain follows potato crops and a dependent food system through the stages shown below. Missing public detail is not proof that internal records did not exist.
Consent, persistence, and relational exposure
Consent
Access, stewardship, breeding, and benefit-sharing arrangements depend on the collection and setting. These are not necessarily individual privacy questions.
Persistence
Later reuse depends on the actual asset and links to other records; no future misuse is asserted.
Relational exposure
Connected institutions, communities, or resource users; no affected-person total is assigned.
Case-specific assessment
availability critical; resilience critical; provenance of varieties important; population consequence GER-5.
GeneticSecurity.org analysis
Genetic Exposure Radius
No single level is assigned where the supplied dossier gives a range, conditional outcome, or broad institutional consequence. The affected parties and proposed assessment are shown separately.
Confidence: not assigned. Classification: GeneticSecurity.org analysis.
Genetic Persistence Risk
Persistence depends on the specific biological material or information retained. A potential effect is not treated as an observed genomic disclosure.
Confidence: not assigned. Classification: GeneticSecurity.org analysis.
Genetic Provenance Integrity
A numeric provenance level is not inferred from the existence of a source or court record. It requires evidence of the relevant custody and processing controls.
Confidence: not assigned. Classification: GeneticSecurity.org analysis.
Proposed classification and its limits
Suggested GER: GER-5. Genetic-resource persistence: high. Suggested GPI: historical/uncertain; do not force a numeric score without adequate records.
These are proposed classifications from the supplied case dossier. Conditional scores describe an assumed exposure; they are not evidence that it occurred. A single numeric value is left unassigned when the asset or outcome is not sufficiently bounded.
What this case does not prove
The famine cannot be explained by genetics alone, and Irish agriculture was not literally one genotype everywhere.
Mitigations and lessons
- Crop and varietal diversity
- Resistant breeding
- Decentralized seed systems
- Disease surveillance
- Social safety nets
- Protection against single-crop dependency
Primary sources
Secondary sources
No additional source listed. See the evidence notes for limitations.
Policy and standards
Genetic Security Policy and StandardsReview and correction history
Source edition: September 19, 2026. Imported case account; no substantive corrections recorded.
Correction policy and logCite this case
GS-CASE-063. The Irish Potato Famine: When Uniformity Turned Blight into Catastrophe. GeneticSecurity.org. https://geneticsecurity.org/cases/063-irish-potato-famine-genetic-diversity/