Entomological warfare

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Entomological warfare (EW) is a type of biological warfare that uses insects to interrupt supply lines by damaging crops, or to directly harm enemy combatants and civilian populations. There have been several programs which have attempted to institute this methodology; however, there has been limited application of entomological warfare against military or civilian targets, Japan being the only state known to have verifiably implemented the method against another state, namely the Chinese during World War II. However, EW was used more widely in antiquity, in order to repel sieges or cause economic harm to states. Research into EW was conducted during both World War II and the Cold War by numerous states such as the Soviet Union, United States, Germany and Canada. There have also been suggestions that it could be implemented by non-state actors in a form of bioterrorism. Under the Biological and Toxic Weapons Convention of 1972, use of insects to administer agents or toxins for hostile purposes is deemed to be against international law.

Contents

Description

EW is a specific type of biological warfare (BW) [1] that uses insects in a direct attack or as vectors to deliver a biological agent, such as plague or cholera. Essentially, EW exists in three varieties. [2] One type of EW involves infecting insects with a pathogen and then dispersing the insects over target areas. [3] The insects then act as a vector, infecting any person or animal they might bite. Another type of EW is a direct insect attack against crops; the insect may not be infected with any pathogen but instead represents a threat to agriculture. [3] The final method of entomological warfare is to use uninfected insects, such as bees, to directly attack the enemy. [2]

Early history

Entomological warfare is not a new concept; historians and writers have studied EW in connection to multiple historic events. A 14th-century plague epidemic in Asia Minor that eventually became known as the Black Death (carried by fleas) is one such event that has drawn attention from historians as a possible early incident of entomological warfare. [4] That plague's spread over Europe may have been the result of a biological attack on the Crimean city of Kaffa. [4]

According to Jeffrey Lockwood, author of Six-Legged Soldiers (a book about EW), the earliest incident of entomological warfare was probably the use of bees by early humans. [5] The bees or their nests were thrown into caves to force the enemy out and into the open. [5] Lockwood theorizes that the Ark of the Covenant may have been deadly when opened because it contained deadly fleas. [5] [6]

During the American Civil War the Confederacy accused the Union of purposely introducing the harlequin bug in the South. [1] These accusations were never proven, and modern research has shown that it is more likely that the insect arrived by other means. [1] The world did not experience large-scale entomological warfare until World War II; Japanese attacks in China were the only verified instance of BW or EW during the war. [1] During, and following, the war other nations began their own EW programs.

World War II

The Colorado potato beetle was considered as an EW weapon by nations on both sides of WWII Escaravello051eue.jpg
The Colorado potato beetle was considered as an EW weapon by nations on both sides of WWII

France

France is known to have pursued entomological warfare programs during World War II. [7] Like Germany, the nation suggested that the Colorado potato beetle, aimed at the enemy's food sources, would be an asset during the war. [7] As early as 1939 biological warfare experts in France suggested that the beetle be used against German crops. [8]

Germany

Germany is known to have pursued entomological warfare programs during World War II. [7] The nation pursued the mass-production, and dispersion, of the Colorado potato beetle (Lepinotarsa decemlineata), aimed at the enemy's food sources. [7] The beetle was first found in Germany in 1914, as an invasive species from North America. [9] There are no records that indicate the beetle was ever employed as a weapon by Germany, or any other nation during the war. [9] Regardless, the Germans had developed plans to drop the beetles on English crops. [10]

Germany carried out testing of its Colorado potato beetle weaponization program south of Frankfurt, where they released 54,000 of the beetles. [9] In 1944, an infestation of Colorado potato beetles was reported in Germany. [9] The source of the infestation is unknown, but speculation has offered three alternative theories as to the origin of the infestation. One option is Allied action, an entomological attack, another is that it was the result of the German testing, and another more likely explanation is that it was merely a natural occurrence. [9]

Canada

Among the Allied Powers, Canada led the pioneering effort in vector-borne warfare. [4] After Japan became intent on developing the plague flea as a weapon, Canada and the United States followed suit. [4] Cooperating closely with the United States, Dr. G.B. Reed, chief of Kingston's Queen's University's Defense Research Laboratory, focused his research efforts on mosquito vectors, biting flies, and plague-infected fleas during World War II. [11] Much of this research was shared with or conducted in concert with the United States. [11]

Canada's entire bio-weapons program was ahead of the British and the Americans during the war. [4] The Canadians tended to work in areas their allies ignored; entomological warfare was one of these areas. [4] As the U.S. and British programs evolved, the Canadians worked closely with both nations. The Canadian BW work would continue well after the war, [12] including entomological research. [11]

Japan

Philadelphia Department of Health poster warning the public of housefly hazards (c. 1942) Fly bomber Philadelphia.png
Philadelphia Department of Health poster warning the public of housefly hazards (c. 1942)

Japan used entomological warfare on a large scale during World War II in China. [13] Unit 731, Japan's biological warfare unit, led by Lt. General Shirō Ishii, used plague-infected fleas and flies covered with cholera to infect the population in China. [13] Japanese Yagi bombs developed at Pingfan consisted of two compartments, one with houseflies and another with a bacterial slurry that coated the houseflies prior to release. The Japanese military dispersed them from low-flying airplanes; spraying the fleas from them and dropping the Yagi bombs filled with a mixture of insects and disease. [7] Localized and deadly epidemics resulted and nearly 500,000 Chinese died of disease. [13] [14] An international symposium of historians declared in 2002 that Japanese entomological warfare in China was responsible for the deaths of 440,000. [7]

United Kingdom

A British scientist, J.B.S. Haldane, suggested that Britain and Germany were both vulnerable to entomological attack via the Colorado potato beetle. [8] In 1942 the United States shipped 15,000 Colorado potato beetles to Britain for study as a weapon. [9]

Cold War

Soviet Union

The Soviet Union researched, developed and tested an entomological warfare program as a major part of an anti-crop and anti-animal BW program. The Soviets developed techniques for using insects to transmit animal pathogens, such as: foot and mouth disease—which they used ticks to transmit; avian ticks to transmit Chlamydophila psittaci to chickens; and claimed to have developed an automated mass insect breeding facility, capable of outputting millions of parasitic insects per day. [15]

United States

The U.S. dropped over 300,000 uninfected mosquitoes on its own population. Aedes aegypti CDC-Gathany.jpg
The U.S. dropped over 300,000 uninfected mosquitoes on its own population.

The United States seriously researched the potential of entomological warfare during the Cold War. Labs at Fort Detrick were set up to produce 100 million yellow fever-infected mosquitoes per month deliverable by bombs or missiles. [7] The facility could also breed 50 million fleas per week and later experimented with other diseases such as anthrax, cholera, dengue, dysentery, malaria, relapsing fever, and tularemia. [1] A U.S. Army report [13] titled "Entomological Warfare Target Analysis" listed vulnerable sites within the Soviet Union that the U.S. could attack using entomological vectors. [7] The military also tested the mosquito biting capacity by dropping uninfected mosquitoes over U.S. cities. [7]

North Korean and Chinese officials leveled accusations that during the Korean War the United States engaged in biological warfare, including EW, in North Korea. The claim is dated to the period of the war, and has been thoroughly denied by the U.S. [16] In 1998, Stephen Endicott and Edward Hagerman claimed that the accusations were true in their book, The United States and Biological Warfare: Secrets from the Early Cold War and Korea. [11] The book received mixed reviews, some called it "bad history" [17] and "appalling", [16] while others praised the case the authors made. [17] Other historians have revived the claim in recent decades as well. [18] The same year Endicott and Hagerman's book was published Kathryn Weathersby and Milton Leitenberg of the Cold War International History Project at the Woodrow Wilson Center in Washington released a cache of Soviet and Chinese documents which revealed the North Korean claim was an elaborate disinformation campaign. [18]

A rat flea, the species used in U.S. EW testing during the 1950s Scanning Electron Micrograph of a Flea.jpg
A rat flea, the species used in U.S. EW testing during the 1950s

During the 1950s the United States conducted a series of field tests using entomological weapons. Operation Big Itch, in 1954, was designed to test munitions loaded with uninfected fleas ( Xenopsylla cheopis ). [8] Big Itch went awry when some of the fleas escaped into the plane and bit all three members of the air crew. [8] In May 1955 over 300,000 uninfected mosquitoes ( Aedes aegypti ) were dropped over parts of the U.S. state of Georgia to determine if the air-dropped mosquitoes could survive to take meals from humans. [19] The mosquito tests were known as Operation Big Buzz. [14] Operation Magic Sword was a 1965 U.S. military operation designed to test the effectiveness of the sea-borne release of insect vectors for biological agents. The U.S. engaged in at least two other EW testing programs, Operation Drop Kick and Operation May Day. [19] A 1981 Army report outlined these tests as well as multiple cost-associated issues that occurred with EW. [19] The report is partially declassified—some information is blacked out, including everything concerning "Drop Kick" [19] —and included "cost per death" calculations. [3] The cost per death, according to the report, for a vector-borne biological agent achieving a 50% mortality rate in an attack on a city was $0.29 in 1976 dollars (approximately $1.01 today). [19] Such an attack was estimated to result in 625,000 deaths. [19]

At Kadena Air Force Base, an Entomology Branch of the U.S. Army Preventive Medicine Activity, U.S. Army Medical Center was used to grow "medically important" arthropods, including many strains of mosquitoes in a study of disease vector efficiency. [20] The program reportedly supported a research program studying taxonomic and ecological data surveys for the Smithsonian Institution. [20] The Smithsonian Institution and The National Academy of Sciences and National Research Council administered special research projects in the Pacific. [21] The Far East Section of the Office of the Foreign Secretary (the NAS Foreign Secretary, not the UK office) administered two such projects which focused "on the flora of Okinawa" and "trapping of airborne insects and arthropods for the study of the natural dispersal of insects and arthropods over the ocean." [21] : 59  The motivation for civilian research programs of this nature was questioned when it was learned that such international research was in fact funded by and provided to the U.S. Army as part of the U.S. military's biological warfare research. [22] [23]

The United States has also applied entomological warfare research and tactics in non-combat situations. In 1990 the U.S. funded a $6.5 million program designed to research, breed and drop caterpillars. [24] The caterpillars were to be dropped in Peru on coca fields as part of the American War on Drugs. [24]

In 1996 Russia filed charges on behalf of Cuba. The Cubans had been accusing the United States of using insects to spread dengue fever and other crop pests during the Cold War. A committee was formed to investigate the accusation but could neither confirm nor deny the charges. [25]

In 2002 U.S. entomological anti-drug efforts at Fort Detrick were focused on finding an insect vector for a virus that affects the opium poppy. [3]

Bioterrorism

Clemson University's Regulatory and Public Service Program listed "diseases vectored by insects" among bioterrorism scenarios considered "most likely". [26] Because invasive species are already a problem worldwide one University of Nebraska entomologist considered it likely that the source of any sudden appearance of a new agricultural pest would be difficult, if not impossible, to determine. [27] Lockwood considers insects a more effective means of transmitting biological agents for acts of bioterrorism than the actual agents. [28] In his opinion insect vectors are easily gathered and their eggs are easily transportable without detection. [28] Isolating and delivering biological agents, on the other hand, is extremely challenging and hazardous. [28]

In one of the few suspected acts of entomological bioterrorism an eco-terror group known as The Breeders claimed to have released Mediterranean fruit flies (medflies) amidst an ongoing California infestation. [29] Lockwood asserts that there is some evidence the group played a role in the event. [10] The pest attacks a variety of crops and the state of California responded with a large-scale pesticide spraying program. [29] At least one source asserted that there is no doubt that an outside hand played a role in the dense 1989 infestation. [30] The group stated in a letter to then Los Angeles Mayor Tom Bradley that their goals were twofold. [29] They sought to cause the medfly infestation to grow out of control which, in turn, would render the ongoing malathion spraying program financially infeasible. [29]

The Biological and Toxic Weapons Convention (BWC) of 1972 does not specifically mention insect vectors in its text. [31] The language of the treaty, however, does cover vectors. [31] Article I bans "Weapons, equipment or means of delivery designed to use such agents or toxins for hostile purposes or in armed conflict." [31] [32] It would appear, due to the text of the BWC, that insect vectors as an aspect of entomological warfare are covered and outlawed by the convention. [33] The issue is less clear when warfare with uninfected insects against crops is considered. [31]

Genetically engineered insects

US intelligence officials have suggested that insects could be genetically engineered via technologies such as CRISPR to create GMO "killer mosquitoes" or plagues that wipe out staple crops. [34] There is research ongoing to genetically modify mosquitoes to curb the spread of diseases, such as Zika, and the West Nile virus by using mosquitoes modified using CRISPR to no longer carry the pathogen. However, this research also shows that it may also be possible to implant diseases or pathogens via genetic modification. [35] It has been suggested by the Max Planck Institute for Evolutionary Biology that current US research into genetically modified insects for crop protection via infectious diseases which spread genetic modifications to crops en masse could lead to the creation of genetically modified insects for use in warfare. [36] [37]

See also

Related Research Articles

<span class="mw-page-title-main">Biological warfare</span> Use of strategically designed biological weapons

Biological warfare, also known as germ warfare, is the use of biological toxins or infectious agents such as bacteria, viruses, insects, and fungi with the intent to kill, harm or incapacitate humans, animals or plants as an act of war. Biological weapons are living organisms or replicating entities. Entomological (insect) warfare is a subtype of biological warfare.

Incapacitating agent is a chemical or biological agent which renders a person unable to harm themselves or others, regardless of consciousness.

<span class="mw-page-title-main">Pest control</span> Control of harmful species

Pest control is the regulation or management of a species defined as a pest; such as any animal, plant or fungus that impacts adversely on human activities or environment. The human response depends on the importance of the damage done and will range from tolerance, through deterrence and management, to attempts to completely eradicate the pest. Pest control measures may be performed as part of an integrated pest management strategy.

<span class="mw-page-title-main">Sterile insect technique</span> Method of biological control for insect populations

The sterile insect technique (SIT) is a method of biological insect control, whereby overwhelming numbers of sterile insects are released into the wild. The released insects are preferably male, as this is more cost-effective and the females may in some situations cause damage by laying eggs in the crop, or, in the case of mosquitoes, taking blood from humans. The sterile males compete with fertile males to mate with the females. Females that mate with a sterile male produce no offspring, thus reducing the next generation's population. Sterile insects are not self-replicating and, therefore, cannot become established in the environment. Repeated release of sterile males over low population densities can further reduce and in cases of isolation eliminate pest populations, although cost-effective control with dense target populations is subjected to population suppression prior to the release of the sterile males.

<span class="mw-page-title-main">Japan and weapons of mass destruction</span> Aspect of Japans military history

Beginning in the mid-1930s, Japan conducted numerous attempts to acquire and develop weapons of mass destruction. The 1943 Battle of Changde saw Japanese use of both bioweapons and chemical weapons, and the Japanese conducted a serious, though futile, nuclear weapon program.

Agroterrorism, also known as agriterrorism and agricultural terrorism, is a malicious attempt to disrupt or destroy the agricultural industry and/or food supply system of a population through "the malicious use of plant or animal pathogens to cause devastating disease in the agricultural sectors". It is closely related to the concepts of biological warfare, chemical warfare and entomological warfare, except carried out by non-state parties.

<span class="mw-page-title-main">Medical entomology</span> Study of insect impacts on human health

The discipline of medical entomology, or public health entomology, and also veterinary entomology is focused upon insects and arthropods that impact human health. Veterinary entomology is included in this category, because many animal diseases can "jump species" and become a human health threat, for example, bovine encephalitis. Medical entomology also includes scientific research on the behavior, ecology, and epidemiology of arthropod disease vectors, and involves a tremendous outreach to the public, including local and state officials and other stake holders in the interest of public safety.

The United States biological weapons program officially began in spring 1943 on orders from U.S. President Franklin D. Roosevelt. Research continued following World War II as the U.S. built up a large stockpile of biological agents and weapons. Over the course of its 27-year history, the program weaponized and stockpiled seven bio-agents — Bacillus anthracis (anthrax), Francisella tularensis (tularemia), Brucella spp (brucellosis), Coxiella burnetii (Q-fever), Venezuelan equine encephalitis virus, Botulinum toxin (botulism), and Staphylococcal enterotoxin B. The US also pursued basic research on many more bio-agents. Throughout its history, the U.S. bioweapons program was secret. It was later revealed that laboratory and field testing had been common. The official policy of the United States was first to deter the use of bio-weapons against U.S. forces and secondarily to retaliate if deterrence failed.

Erich Traub was a German veterinarian, scientist and virologist who specialized in foot-and-mouth disease, Rinderpest and Newcastle disease. Traub was a member of the National Socialist Motor Corps (NSKK), a Nazi motorist corps, from 1938 to 1942. He worked directly for Heinrich Himmler, head of the Schutzstaffel (SS), as the lab chief of the Nazis' leading bio-weapons facility on Riems Island.

<span class="mw-page-title-main">Operation Big Itch</span> 1954 US entomological warfare test

Operation Big Itch was a U.S. entomological warfare field test using uninfected fleas to determine their coverage and survivability as a vector for biological agents. The tests were conducted at Dugway Proving Ground in 1954.

Operation Big Buzz was a U.S. military entomological warfare field test conducted in 1955 on Savannah, Georgia's predominantly Black Carver Village neighborhood. The tests involved dispersing over 300,000 mosquitoes from aircraft and through ground dispersal methods.

The E14 munition was a cardboard sub-munition developed by the United States biological weapons program as an anti-crop weapon. In a series of field tests in 1955, the E14 was loaded with fleas and air-dropped.

The E86 cluster bomb was an American biological cluster bomb first developed in 1951. Though the U.S. military intended to procure 6,000 E86s, the program was halted in the first half of the 1950s.

The E23 munition was a cardboard sub-munition developed by the United States biological weapons program for use as an anti-crop weapon. The E23 underwent a conversion for use as a vector weapon and was briefly used in large-scale entomological warfare trial but technical issues forced it from the tests.

<i>Six-legged Soldiers</i> 2008 book by Jeffrey A. Lockwood

Six-Legged Soldiers: Using Insects as Weapons of War is a nonfiction scientific warfare book written by author and University of Wyoming professor, Jeffrey A. Lockwood. Published in 2008 by Oxford University Press, the book explores the history of bioterrorism, entomological warfare, biological warfare, and the prevention of agro-terrorism from the earliest times to modern threats. Lockwood, an entomologist, preceded this book with Ethical issues in biological control (1997) and Locust: The devastating rise and mysterious disappearance of the insect that shaped the American frontier (2004), among others.

<span class="mw-page-title-main">Horn Island Chemical Warfare Service Quarantine Station</span>

Horn Island Chemical Warfare Service Quarantine Station, also known as the Horn Island Testing Station, was a U.S. biological weapons testing site during World War II. It was located on Mississippi's Horn Island and opened in 1943. When the war ended, the facility was closed.

Operation Magic Sword was a 1965 U.S. military operation designed to test the effectiveness of the sea-borne release of insect vectors for biological agents.

<span class="mw-page-title-main">Allegations of biological warfare in the Korean War</span> Allegations of US biological warfare

Allegations that the United States military used biological weapons in the Korean War were raised by the governments of the People's Republic of China, the Soviet Union, and North Korea. The claims were first raised in 1951. The story was covered by the worldwide press and led to a highly publicized international investigation in 1952. Secretary of State Dean Acheson and other American and allied government officials denounced the allegations as a hoax. Subsequent scholars are split about the truth of the claims.

<span class="mw-page-title-main">War against the potato beetle</span> Pest control campaign in the Warsaw Pact

The war against the potato beetle was a campaign launched in Warsaw Pact countries during the Cold War to eradicate the Colorado potato beetle. It was also a propaganda operation that alleged it was introduced into East Germany, the People's Republic of Poland and Communist Czechoslovakia by the United States as a form of entomological warfare. Communist propaganda of the time claimed that the insect was being dropped from parachutes and balloons, with the intent of immiserating the populations of these countries, causing famines, and facilitating an economic crisis.

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