Agroterrorism: A Low-Frequency, High-Impact Threat

Cold War politics generated further accusations — East German charges in 1950 that Colorado potato beetles were deliberately introduced, and Cuban claims of U.S. biological attacks on crops and pigs — but international inquiries often found the evidence inconclusive or consistent with natural outbreaks.

For contemporary U.S. policy, indicators of adversary interest have been at least as important as proven attacks. A 2003 Senate hearing on agroterrorism reported that al-Qaeda and other groups had collected detailed information on U.S. agriculture and explored the use of crop-dusting aircraft and livestock diseases. Congressional and academic work documents agroterrorism’s appeal in extremist discourse as a relatively cheap method to hurt an advanced economy by releasing organisms that spread autonomously once introduced. Official reviews are clear that the United States has not suffered a confirmed large-scale agroterrorist attack; instead, natural and accidental outbreaks serve as model events for what a deliberate attack might look like — and how hard it might be to recognize as deliberate.

What an Attack on U.S. Agriculture Could Look Like
Contemporary scenario work focuses on three broad modes of attack: introduction of highly contagious animal diseases, dissemination of crop pathogens or pests, and contamination of processing and distribution nodes — often combined with cyber disruption.

Livestock disease.The canonical scenario is deliberate introduction of FMD or a similarly contagious transboundary disease into concentrated animal feeding operations for cattle or swine. The United States has been FMD-free since 1929, meaning livestock have no natural immunity, and the density of modern production — combined with frequent movement of animals and personnel — enables rapid spread. A small team could infect animals at multiple facilities in different states, allowing the disease to propagate before veterinary surveillance flags unusual mortality and before movement bans can be enforced.

Crop pathogens and pests.Agents such as wheat stem rust could be disseminated through contaminated seed, infected plant material, or limited aerial dispersal over major grain belts. Because early symptoms often mimic common environmental stresses, a pathogen could establish itself across thousands of hectares before extension services recognize an anomaly. Introducing a non-native insect pest could create a chronic, resource-draining problem rather than a dramatic acute crisis — harder to attribute and harder to eradicate.

Food processing and logistics.An insider at a large slaughterhouse, dairy plant, or produce packing facility could introduce a pathogen or toxin into production lines, producing geographically dispersed contamination that is difficult to trace quickly. Analysts increasingly examine hybrid attacks in which biological adulteration is paired with cyberattacks on logistics and traceability systems — corrupting outbreak data, delaying recognition of contamination patterns, and disrupting recall or quarantine operations.

Economic and social consequences.Economic modeling makes clear how destructive these scenarios could be. A computable general equilibrium analysis of hypothetical FMD agroterrorism events found that even modest outbreaks could cause output losses in the tens of billions of dollars. Multi-state scenarios yielded simulated losses exceeding $200 billion, reflecting mass culling, long-term export bans, and broader macroeconomic spillovers. Earlier work described a successful agroterrorist attack as capable of delivering a crippling blow to the national economy disproportionate to the operational cost to attackers — a ratio that makes agriculture an attractive target in adversarial cost-benefit terms.

U.S. Measures to Prevent, Detect, and Respond
In the wake of 9/11 and the 2001 anthrax attacks, the United States built a multi-layered framework to protect agriculture and food as critical infrastructure, spanning strategic policy, surveillance, and public-private cooperation.

Strategic and legal frameworks.Homeland Security Presidential Directive 9 (HSPD-9), issued in 2004, established a national policy to protect agriculture and food from terrorist attacks and major emergencies, assigning roles to DHS, USDA, and other departments. It calls for early warning systems for animal and plant diseases, regular vulnerability assessments of critical agricultural infrastructure, and improved response capabilities. The 2002 Public Health Security and Bioterrorism Preparedness and Response Act and the 2011 Food Safety Modernization Act (FSMA) expanded FDA authority and shifted food safety policy toward prevention — requiring hazard analysis, risk-based preventive controls, and specific mitigation strategies for intentional adulteration at processing facilities.

Surveillance, diagnostics, and research.Operationally, the United States relies on networks of veterinarians, diagnostic laboratories, and extension agents to detect unusual patterns of animal illness and unexpected crop disease. These networks feed data to USDA and DHS, which can order quarantines, movement controls, and culling. Animal identification and traceability programs are designed to accelerate tracing of infected animals — essential in a fast-moving disease like FMD. USDA and DHS also invest in vaccines, rapid diagnostics, and resistant breeds and varieties, including work conducted at high-containment facilities discussed in Section VIII.

Private sector integration.Many large food processors and agribusiness firms have implemented access controls, background checks, tamper-evident packaging, and internal food defense plans, often in response to FSMA requirements. Public-private partnerships support threat information sharing and joint exercises. The weak link is the long tail of smaller operators — small farms and local processors — who may lack the resources or expertise to implement comparable measures, producing an uneven security landscape that a sophisticated attacker could map and exploit.

Persistent Vulnerabilities and Governance Gaps
Despite substantial formal architecture, audits and expert analysis repeatedly find that preparedness remains incomplete. A 2020 report by USDA’s Office of Inspector General concluded that the department’s Office of Homeland Security and Emergency Coordination had not adequately overseen agroterrorism prevention, detection, and response activities. The office lacked a mechanism to track compliance with HSPD-9, had not conducted the required department-wide vulnerability assessments, and relied on ad hoc tracking rather than systematic evaluation of whether mandated measures were actually being implemented.

Front-line capacity is another weak point. State and local law enforcement officers — likely to be first on scene at a suspicious incident — often have limited training in recognizing agroterrorism indicators, handling biological evidence, or coordinating with veterinary and agricultural authorities. Fragmentation across public health, agriculture, homeland security, and law enforcement institutions can delay recognition that a disease event might be intentional, while jurisdictional and information-sharing obstacles complicate coordinated response. And at the physical level, the open and dispersed nature of agriculture means that traditional perimeter security is neither possible nor sufficient; resilience therefore depends on early detection, rapid containment, and cooperative relationships with producers and state agencies.

Congressional engagement has continued. In 2025, the House Subcommittee on Emergency Management and Technology held a hearing examining updated threat assessments, veterinary surge capacity, and interagency coordination. Legal scholarship has also been evolving, increasingly treating agroterrorism within a framework of international food security and human rights — recognizing that a major attack on a large agricultural exporter like the United States could drive global price spikes and worsen hunger in importing countries, making it a matter of international, not merely national, concern.

Legal, Ethical, and International Dimensions
Legally, deliberate attacks on agriculture using biological or chemical agents can violate domestic anti-terrorism statutes, the Biological Weapons Convention, and — when state-sponsored — norms governing the use of force. When orchestrated by states, such operations blur into biological warfare even if their primary effect is economic rather than lethal.

Ethically, agroterrorism is increasingly conceptualized as an assault on the human right to adequate food. Intentional disruption of food systems, particularly where food security is already precarious, inflicts harm that goes beyond economic damage — it threatens basic welfare and dignity. In a globally integrated food system, a major agroterror event in the United States would not stay within U.S. borders; the consequences would ripple through commodity markets and into the food security of importing nations, raising the stakes of prevention well beyond domestic policy.

Technological Change and Future Risk
Emerging technologies both heighten and complicate the agroterrorism threat. Advances in genomics, synthetic biology, and gene editing raise the possibility of engineering more virulent plant and animal pathogens, or modifying pests to evade existing controls. The same tools, however, also enable more precise and rapid diagnostics, improved vaccines, and data-driven surveillance that can shorten detection times and make responses more targeted.

Digitization adds a cyber layer that homeland security professionals will recognize immediately. Precision agriculture, sensor networks, and digital logistics systems are new attack surfaces: adversaries could corrupt disease outbreak data, disable cold chains, or manipulate traceability systems to obscure contamination. Contemporary food defense strategies increasingly treat cybersecurity, biosecurity, and physical security as integrated rather than separate disciplines — a convergence that mirrors developments in other critical infrastructure sectors.

High-Containment Research: Plum Island and the National Bio and Agro-Defense Facility
Two facilities are central to the scientific infrastructure underlying U.S. agroterrorism defense. The Plum Island Animal Disease Center (PIADC), off the eastern tip of Long Island, has since the 1950s served as the nation’s primary laboratory for foreign animal disease research, focusing above all on FMD — developing vaccines, improving diagnostics, and providing surge capacity during suspected outbreaks. Management shifted from USDA to DHS after 9/11, reflecting the national security dimension of the work.

Recognizing the limitations of an aging island facility, DHS and USDA decided to transition PIADC’s mission to the new National Bio and Agro-Defense Facility (NBAF) in Manhattan, Kansas — a purpose-built, 574,000-square-foot installation that, unlike Plum Island, includes biosafety level 4 capacity for the most dangerous zoonotic pathogens. NBAF is now operational, with USDA’s Agricultural Research Service and Animal and Plant Health Inspection Service as principal occupants; Plum Island continues limited activity during a phased transition.

The move has been debated — primarily over whether placing a high-containment facility in a tornado-prone region of dense livestock country is prudent. Supporters argue that modern engineering can address regional hazard profiles, and that NBAF’s upgraded containment systems represent a more manageable risk than the aging infrastructure, coastal storm exposure, and sea-level rise vulnerability of Plum Island. From an agroterrorism standpoint, both facilities serve the same core functions: providing secure environments to study potential bioweapon agents, acting as national reference laboratories able to rapidly confirm or exclude high-consequence pathogens, and — through strict biosecurity protocols — minimizing the risk that dangerous materials could be diverted or accidentally released.

Overall Assessment
Agroterrorism is, in many ways, a threat that resembles the sector it targets: diffuse, hard to see coming, and prone to cascading consequences once something goes wrong. The absence of a major confirmed attack in the United States reflects real deterrence and real operational difficulty for adversaries — but also the structural ambiguity of agricultural disease, which makes attribution hard and complacency easy.

The policy architecture built since 9/11 — HSPD-9, FSMA, surveillance networks, high-containment research capacity — represents genuine progress. Yet the 2020 USDA Inspector General report, recurring congressional concern, and the inherent difficulty of securing an open agricultural landscape all point to the same conclusion: the framework exists, but implementation is uneven and resilience is incomplete.

For homeland security professionals, the relevant lesson may be one of analogy. Agroterrorism shares structural features with other critical infrastructure threats they know well: cascading interdependencies, insider risk, the cyber-physical convergence, the challenge of coordinating across fragmented jurisdictions. Applying that cross-sector experience — rather than treating agroterrorism as a niche biological problem owned solely by USDA — may be as important as any single programmatic fix. The same features that make modern agriculture extraordinarily productive also make it vulnerable; the policy task is to close that gap without undermining the openness on which food security ultimately depends.

Ben Frankel is the editor of The Homeland Security News Wire.