Locust
![](https://upload.wikimedia.org/wikipedia/commons/thumb/2/25/Locusta-migratoria-wanderheuschrecke.jpg/220px-Locusta-migratoria-wanderheuschrecke.jpg)
![](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5f/CSIRO_ScienceImage_7007_Plague_locusts_on_the_move.jpg/220px-CSIRO_ScienceImage_7007_Plague_locusts_on_the_move.jpg)
Locusts(derived from theLatinlocusta,locust or lobster[1]) are variousspeciesof short-hornedgrasshoppersin the familyAcrididaethat have aswarmingphase. These insects are usually solitary, but under certain circumstances they become more abundant and change their behaviour and habits, becominggregarious.No taxonomic distinction is made between locust and grasshopper species; the basis for the definition is whether a species forms swarms under intermittently suitable conditions; this has evolved independently in multiple lineages, comprising at least 18 genera in 5 different subfamilies.
Normally, these grasshoppers are innocuous, their numbers are low, and they do not pose a major economic threat to agriculture. However, under suitable conditions ofdroughtfollowed by rapid vegetation growth,serotoninin their brains triggers dramatic changes: they start to breed abundantly, becoming gregarious and nomadic (loosely described asmigratory) when their populations become dense enough. They form bands of winglessnymphsthat later become swarms of winged adults. Both the bands and the swarms move around, rapidly strip fields, anddamage crops.The adults are powerful fliers; they can travel great distances, consuming most of the green vegetation wherever the swarm settles.
Locusts have formedplaguessinceprehistory.Theancient Egyptianscarved them on their tombs and the insects are mentioned in theIliad,theMahabharata,theBibleandQuran.Swarms have devastated crops and have causedfaminesand human migrations. More recently, changes inagriculturalpractices and better surveillance of locust breeding grounds have allowed control measures at an early stage. Traditional locust control usesinsecticidesfrom the ground or air, but newerbiological controlmethods are proving effective. Swarming behaviour decreased in the 20th century, but despite modern surveillance and control methods, swarms can still form; when suitable weather conditions occur and vigilance lapses, plagues can occur.
Locusts are large insects and convenient for research and classroom study of zoology. They areedible by humans.They have been eaten throughout history and are considered adelicacyin many countries.
Swarming grasshoppers
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Locusts are theswarmingphase of certain species of short-hornedgrasshoppersin the familyAcrididae.These insects are usually solitary, but under certain circumstances become more abundant and change their behaviour and habits, becominggregarious.[2][3][4]
![](https://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Copulating_desert_locust_pair.jpg/220px-Copulating_desert_locust_pair.jpg)
Notaxonomicdistinction is made between locust and grasshopper species; the basis for the definition is whether a species forms swarms under intermittently suitable conditions. In English, the term "locust" is used for grasshopper species that changemorphologicallyand behaviourally on crowding, forming swarms that develop from bands of immature stages called hoppers. The change is described as density-dependentphenotypic plasticity.[5]
These changes are examples of phasepolyphenism;they were first analysed and described byBoris Uvarov,who was instrumental in setting up theAnti-Locust Research Centre.[6]He made his discoveries during his studies of the migratory locust in theCaucasus,whose solitary and gregarious phases had previously been thought to be separate species (Locusta migratoriaandL. danicaL.). He designated the two phases assolitariaandgregaria.[7]These are calledstataryand migratorymorphs,though strictly speaking, their swarms arenomadicrather thanmigratory.Charles Valentine RileyandNorman Criddlewere involved in achieving the understanding and control of locusts.[8][9]
Swarming behaviour is a response to overcrowding. Increased tactile stimulation of the hind legs causes an increase in levels of serotonin.[10]This causes the locust to change colour, eat much more, and breed much more easily. The transformation of the locust to the swarming form is induced by several contacts per minute over a four-hour period.[11]A large swarm can consist of billions of locusts spread out over an area of thousands of square kilometres, with a population of up to 80 million per square kilometre (200 million per square mile).[12]When desert locusts meet, their nervous systems release serotonin, which causes them to become mutually attracted, a prerequisite for swarming.[13][14][15]
The formation of initial bands of gregarious hoppers is called an "outbreak"; when these join into larger groups, the event is known as an "upsurge". Continuing agglomerations of upsurges on a regional level originating from a number of entirely separate breeding locations are known as "plagues".[16]During outbreaks and the early stages of upsurges, only part of the locust population becomes gregarious, with scattered bands of hoppers spread out over a large area. As time goes by, the insects become more cohesive and the bands become concentrated in a smaller area. In the desert locust plague in Africa, the Middle East, and Asia that lasted from 1966 to 1969, the number of locusts increased from two to 30 billion over two generations, but the area covered decreased from over 100,000 square kilometres (39,000 sq mi) to 5,000 square kilometres (1,900 sq mi).[17]
Solitary and gregarious phases
[edit]![](https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/DesertLocust.jpeg/220px-DesertLocust.jpeg)
One of the greatest differences between the solitary and gregarious phases is behavioural. Thegregarianymphs are attracted to each other, this being seen as early as the secondinstar.They soon form bands of many thousands of individuals. These groups behave like cohesive units and move across the landscape, mostly downhill, but making their way around barriers and merging with other bands. The attraction between the insects involves visual andolfactorycues.[18]The bands seem to navigate using the sun. They pause to feed at intervals before continuing on, and may cover tens of kilometres over a few weeks.[7]
Locusts in the gregarious phase differ in morphology and development. In the desert locust and the migratory locust, for example, thegregarianymphs become darker with strongly contrasting yellow and black markings, they grow larger, and have a longer nymphal period; the adults are larger with different body proportions, lesssexual dimorphism,and highermetabolic rates;they mature more rapidly and start reproducing earlier, but have lower levels offecundity.[7]
The mutual attraction between individual insects continues into adulthood, and they continue to act as a cohesive group. Individuals that get detached from a swarm fly back into the mass. Others that get left behind after feeding take off to rejoin the swarm when it passes overhead. When individuals at the front of the swarm settle to feed, others fly past overhead and settle in their turn, the whole swarm acting like a rolling unit with an ever-changing leading edge. The locusts spend much time on the ground feeding and resting, moving on when the vegetation is exhausted. They may then fly a considerable distance before settling in a location where transitory rainfall has caused a green flush of new growth.[7]
Distribution and diversity
[edit]Several species ofgrasshoppersswarm as locusts in different parts of the world, on all continents except Antarctica:[19][20][21][a]For example, theAustralian plague locust(Chortoicetes terminifera) swarms across Australia.[19]
Thedesert locust(Schistocerca gregaria) is probably the best known species owing to its wide distribution (North Africa,Middle East,andIndian subcontinent)[19]and its ability tomigrateover long distances. Amajor infestation covered much of western Africa from 2003 to 2005,after unusually heavy rain set up favourable ecological conditions for swarming. The first outbreaks occurred in Mauritania, Mali, Niger, and Sudan in 2003. The rain allowed swarms to develop and move north to Morocco and Algeria, threatening croplands.[23][24]Swarms crossed Africa, appearing in Egypt, Jordan and Israel, the first time in those countries for 50 years.[25][26]The cost of handling the infestation was put at US$122 million, and the damage to crops at up to $2.5 billion.[27]
Themigratory locust(Locusta migratoria), sometimes classified into up to 10 subspecies, swarms in Africa, Asia, Australia, and New Zealand, but has become rare in Europe.[28]In 2013, the Madagascan form of the migratory locust formed many swarmsof over a billion insects, reaching "plague" status and covering about half the country by March 2013.[29] Species such as theSenegalese grasshopper(Oedaleus senegalensis)[30]and theAfrican rice grasshopper(Hieroglyphus daganensis), both from theSahel,often display locust-like behaviour and change morphologically on crowding.[30]
North America is the only sub-continent besides Antarctica without a native locust species. TheRocky Mountain locustwas formerly one of the most significant insect pests there, but it became extinct in 1902.[31]In the 1930s, during theDust Bowl,a second species of North American locust, the High Plains locust (Dissosteira longipennis) reached plague proportions in the American Midwest. Today, the High Plains locust is a rare species, leaving North America with no regularly swarming locusts.[32][33]
Interaction with humans and animals
[edit]Ancient times
[edit]![](https://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Maler_der_Grabkammer_des_Horemhab_002.jpg/220px-Maler_der_Grabkammer_des_Horemhab_002.jpg)
Study of literature shows how pervasive plagues of locusts were over the course of history. The insects arrived unexpectedly, often after a change of wind direction or weather, and the consequences were devastating. The Ancient Egyptians carved locusts on tombs in the period 2470 to 2220 BC. A devastating plague in Egypt is mentioned in theBook of Exodusin the Bible.[17][34]Locust plague is mentioned in the IndianMahabharata.[35]TheIliadmentions locusts taking to the wing to escape fire.[36]Plagues of locusts are mentioned in the Quran.[12]In the ninth century BC, the Chinese authorities appointed anti-locust officers.[37]In theNew Testament,John the Baptist was said to survive in the wilderness on locusts and wild honey; and human-headed locusts appear in theBook of Revelation.[38]
Aristotlestudied locusts and their breeding habits andLivyrecorded a devastating plague inCapuain 203 BC. He mentioned human epidemics following locust plagues which he associated with the stench from the putrifying corpses; the linking of human disease outbreaks to locust plagues was widespread. A pestilence in the northwestern provinces of China in 311 AD that killed 98% of the population locally was blamed on locusts, and may have been caused by an increase in numbers ofrats(and theirfleas) that devoured the locust carcasses.[37]
Recent times
[edit]![](https://upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Diagrams_of_Locusts_which_swarmed_over_England_in_1748.jpg/220px-Diagrams_of_Locusts_which_swarmed_over_England_in_1748.jpg)
During the last two millennia, desert locust plagues have appeared sporadically in Africa, the Middle East, and Europe. Other species of locusts caused havoc in North and South America, Asia, and Australasia; in China, 173 outbreaks over 1924 years.[37]TheBombay locust(Nomadacris succincta) was a major pest in India and southeastern Asia in the 18th and 19th centuries, but has seldom swarmed since the last plague in 1908.[39]
In the spring of 1747 locusts arrived outsideDamascuseating the majority of the crops and vegetation of the surrounding countryside. One local barber, Ahmad al-Budayri, recalled the locusts "came like a black cloud. They covered everything: the trees and the crops. May God Almighty save us!"[40]
The extinction of theRocky Mountain locusthas been a source of puzzlement. It had swarmed throughout the west of the United States and parts of Canada in the 19th century.Albert's swarmof 1875 was estimated to contain 12.5 trillion insects covering an area of 198,000 square miles (510,000 km2) (larger than the state ofCalifornia) and to weigh 27.5 million tons.[41]The last specimen was seen alive in Canada in 1902. Recent research suggests the breeding grounds of this insect in the valleys of theRocky Mountainscame under sustained agricultural development during the large influx ofgold miners,[42]destroying the underground eggs of the locust.[43][44]
The1915 infestationacross Palestine and Syria was one of the main contributors tofamine in Lebanonwhich lasted from 1915 to 1918 during which around 200,000 people died.[45][46]Plagues became less common in the 20th century, but they continue to occur when the conditions are met.[47][48]
Monitoring
[edit]![](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Eugenio_Morales_en_el_S%C3%A1hara_Espa%C3%B1ol_%281942%29.jpg/170px-Eugenio_Morales_en_el_S%C3%A1hara_Espa%C3%B1ol_%281942%29.jpg)
Early intervention to prevent large locust swarms is more successful than later action once swarms have built up. The means to control locust populations is now available, but organisational, financial, and political problems may be difficult to overcome. Monitoring is the key to early detection and eradication. Ideally, a sufficient proportion of nomadic bands can be killed with insecticide before their swarming phase. This may be possible in richer countries like Morocco and Saudi Arabia, but neighbouring poorer countries such asMauritaniaandYemenlack the resources and may breed locust swarms that threaten the whole region.[12]
Several organisations around the world monitor the threat from locusts. They provide forecasts detailing regions likely to suffer from locust plagues in the near future. In Australia, this service is provided by theAustralian Plague Locust Commission.[49]It has been very successful in dealing with developing outbreaks, but has the great advantage of having a defined area to monitor and defend without locust invasions from elsewhere.[50]In Central and Southern Africa, the service is provided by the International Locust Control Organization for Central and Southern Africa.[51]In West and Northwest Africa, the service is co-ordinated by theFood and Agriculture Organization's Commission for Controlling the Desert Locust in the Western Region, and executed by locust control agencies belonging to each country concerned.[52]The FAO monitors the situation in the Caucasus and Central Asia, where over 25 million hectares of cultivated land are under threat.[53]In February 2020, in an effort to end massive locust outbreaks, India decided to use drones and special equipment to monitor locusts and spray insecticides.[54]
Control
[edit]Historically, people could do little to protect their crops from locusts, although eating the insects may have been some compensation. By the early 20th century, efforts were made to disrupt the development of the insects by cultivating the soil where eggs were laid, collecting hoppers with catching machines, killing them with flamethrowers, trapping them in ditches, and crushing them with rollers and other mechanical methods.[17]By the 1950s, theorganochloridedieldrinwas found to be an extremely effective insecticide, but it was later banned in most countries because of itspersistence in the environmentand itsaccumulationin thefood chain.[17]
In years when locust control is needed, the hoppers are targeted early by applying water-based contactpesticidesfrom tractor-based sprayers. This is effective but slow and labour-intensive; a preferable method is spraying concentrated insecticide from aircraft over the insects or vegetation.[55]The use of ultralow-volume spraying of contact pesticides from aircraft in overlapping swathes is effective against nomadic bands and can be used to treat large areas of land swiftly.[50]Other modern technologies for planning locust control includeGPS,GIS tools,andsatellite imagerywith rapid computer data management and analysis.[56][57]
Abiological pesticideto control locusts was tested across Africa by a multinational team in 1997.[58]Dried fungal spores of aMetarhizium acridumsprayed in breeding areas pierce the locust exoskeleton on germination and invade the body cavity, causing death.[59]The fungus is passed from insect to insect and persists in the area, making repeated treatments unnecessary.[60]This approach to locust control was used in Tanzania in 2009 to treat around 10,000 hectares in the Iku-Katavi National Park infested with adult locusts. The outbreak was contained without harm to the localelephants,hippopotamuses,andgiraffes.[51]
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Preparing to flamelocusts in Palestine,1915
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Cessnaof the International Red Locust Control Organization sprayingred locustsin Iku Katavi National Park, Tanzania, 2009
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Locusts killed by the naturally occurring fungusMetarhizium,an environmentally friendly means of biological control[61]
As experimental models
[edit]The locust is large and easy to breed and rear, and is used as an experimental model in research studies. It has been used in evolutionary biology research and to test the generalizability of conclusions reached about test organisms such as thefruit fly(Drosophila) and thehousefly(Musca).[62][63]It is a suitable school laboratory animal because of its robustness and ease of breeding and handling.[64]
AtTel Aviv University,scientists have been using the antennae's acute sensitivity ofSense of smellto detect different odors in various technologies.[65]
As food
[edit]![](https://upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Skewered_locusts.jpg/170px-Skewered_locusts.jpg)
Locusts have been usedas foodthroughout history. They are considered meat. Several cultures throughout the worldconsume insects,and locusts are considered a delicacy in many African, Middle Eastern, and Asian countries.[66]
They can be cooked in many ways, but are often fried, smoked, or dried.[67] TheBiblerecords thatJohn the Baptistate locusts and wild honey (Greek:ἀκρίδες καὶ μέλι ἄγριον,romanized:akrides kai meli agrion) while living in the wilderness.[68]Attempts have been made to explain the text to meanasceticvegetarianfood such ascarob beans,but the plain meaning of the Greekakridesis locust.[69][70]
TheTorahprohibits the use of most insects as food, but it permits consuming certain types of locust; specifically, those that are red, yellow, or spotted grey.[71][72]Islamic jurisprudencedeems eating locusts to behalal.[73][72]The ProphetMuhammadwas reported to have eaten locusts during a military raid with his companions.[74]
Locusts are eaten in theArabian Peninsula,including Saudi Arabia.[75]In 2014, consumption of locusts spiked aroundRamadanespecially in theAl-Qassim Region,since many Saudis believe they are healthy to eat, but the Saudi Ministry of Health warned that pesticides made them unsafe.[76][77]Yemenisalso consume locusts, and expressed discontent over governmental plans to use pesticides against them.[78]ʻAbd al-Salâm Shabînî described a locust recipe from Morocco.[79]19th century European travellers observed Arabs in Arabia, Egypt, and Morocco selling, cooking, and eating locusts.[80]They reported that in Egypt and Palestine locusts were consumed, and that in Palestine, around the River Jordan, in Egypt, in Arabia, and in Morocco that Arabs ate locusts, while Syrian peasants did not eat locusts.[81]
In the Haouran region,Fellahswho were in poverty and suffered from famine ate locusts after removing the guts and head, while locusts were swallowed whole by Bedouins.[82]Syrians, Copts, Greeks, Armenians, and other Christians and Arabs themselves reported that in Arabia locusts were eaten frequently and one Arab described to a European traveler the different types of locusts which were favored as food by Arabs.[83][84]Persians use theAnti-Arabracial slurArabe malakh-khor(Persian:عرب ملخ خور,literally "locust eater Arab" ) against Arabs.[85][86][87]
Locusts yield about five times more edibleproteinper unit offodderthan cattle, and produce lower levels ofgreenhouse gasesin the process.[88]Thefeed conversion rateof orthopterans is 1.7 kg/kg,[89]while for beef it is typically about 10 kg/kg.[90]The protein content in fresh weight is between 13 and 28 g / 100 g for adult locust, 14–18 g / 100 g for larvae, as compared to 19–26 g / 100 g for beef.[91][92]The calculatedprotein efficiency ratiois low, with 1.69 for locust protein compared to 2.5 for standard casein.[93]A serving of 100 g of desert locust provides 11.5 g of fat, 53.5% of which is unsaturated, and 286 mg of cholesterol.[93]Among the fatty acids,palmitoleic,oleic,andlinolenicacids were found to be the most abundant. Varying amounts of potassium, sodium, phosphorus, calcium, magnesium, iron, and zinc were present.[93]
See also
[edit]- Australian Plague Locust Commission
- List of locust swarms
- Locust (ethnic slur)
- LUBILOSA– Locust research programme
- Periodical cicadas
Notes
[edit]- ^TheAmerican locust(Schistocerca americana) does not swarm.[22]
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{{cite journal}}
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The relative size and robustness of the locust make it simple to handle and ideal for such investigations.
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There is no reason, however, to question the plausibility of Mark 1:6c, that John regularly ate these foods while in the wilderness.
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403: Narrated Ibn Abi Aufa: We participated with the Prophet in six or seven Ghazawat, and we used to eat locusts with him.
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External links
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![](https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
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- Visual neuron of the locust,Ri Channel video, October 2011
- FAO Locust Watch
- FAO EMPRESArchived20 March 2010 at theWayback Machine
- FAO eLocust3e suite
- eLocust3M android app
- Desert Locust Meteorological Monitoring at Sahel Resources
- Locust Video
- USAID Supplemental Environmental Assessment of the Eritrean Locust Control Program
- USAID Supplemental Environmental Assessment: Pakistan Locust Control Programs, August 1993
- footageonYouTube
- When The Skies Turned To Black, The Locust Plague of 1875