Locusts are a collection of certain species of short-horned grasshoppers in the family Acrididae that have a swarming phase. These insects are usually solitary, but under certain circumstances they become more abundant and change their behaviour and habits, becoming gregarious. 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. These grasshoppers are innocuous, their numbers are low, and they do not pose a major economic threat to agriculture. However, under suitable conditions of drought followed by rapid vegetation growth, serotonin in their brains triggers a dramatic set of changes: they start to breed abundantly, becoming gregarious and nomadic (loosely described as migratory) when their populations become dense enough. They form bands of wingless nymphs which later become swarms of winged adults. Both the bands and the swarms move around and rapidly strip fields and cause damage to crops. The adults are powerful fliers; they can travel great distances, consuming most of the green vegetation wherever the swarm settles.
Locusts have formed plagues since prehistory. The ancient Egyptians carved them on their tombs and the insects are mentioned in the Iliad , the Bible and the Quran. Swarms have devastated crops and been a contributory cause of famines and human migrations. More recently, changes in agricultural practices and better surveillance of locations where swarms tend to originate, have meant that control measures can be used at an early stage. The traditional means of control are based on the use of insecticides from the ground or the air, but other methods using biological control are proving effective.
Swarming behaviour decreased in the 20th century, but despite modern surveillance and control methods, the potential for swarms to form is still present, and when suitable climatic conditions occur and vigilance lapses, plagues can still occur. Locusts are large insects and convenient for use in research and the study of zoology in the classroom. They are also edible insects; they have been eaten throughout history and are considered a delicacy in many countries. The word "locust" is derived from the Vulgar Latin locusta, meaning grasshopper.
Locusts are the swarming phase of certain species of short-horned grasshoppers in the family Acrididae. These insects are usually solitary, but under certain circumstances become more abundant and change their behaviour and habits, becoming gregarious.
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. In English, the term "locust" is used for grasshopper species that change morphologically and behaviourally on crowding, forming swarms that develop from bands of immature stages called hoppers. The change is referred to in the technical literature as "density-dependent phenotypic plasticity".
These changes are examples of phase polymorphism; they were first analysed and described by Boris Uvarov, who was instrumental in setting up the Anti-Locust Research Centre.He made his discoveries during his studies of the Migratory locust in Caucasus, whose solitary and gregarious phases had previously been thought to be separate species (Locusta migratoria and L. danica L.). He designated the two phases as solitaria and gregaria. These are also referred to as statary and migratory morphs, though strictly speaking, their swarms are nomadic rather than migratory. Charles Valentine Riley and Norman Criddle were also involved in achieving the understanding and control of locusts.
Swarming behaviour is a response to overcrowding. Increased tactile stimulation of the hind legs causes an increase in levels of serotonin.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. 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). When desert locusts meet, their nervous systems release serotonin, which causes them to become mutually attracted, a prerequisite for swarming.
The initial bands of gregarious hoppers are known as "outbreaks", and when these join together 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". 100,000 square kilometres (39,000 sq mi) to 5,000 square kilometres (1,900 sq mi).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
One of the greatest differences between the solitary and gregarious phases is behavioural. The gregaria nymphs are attracted to each other, this being seen as early as the second instar. 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 seems to be largely visual, but also involves olfactory cues, and the band seem to navigate using the sun. They pause to feed at intervals before resuming their march, and may cover tens of kilometres over a few weeks.
Also, differences in morphology and development are seen. In the desert locust and the migratory locust, for example, the gregaria nymphs become darker with strongly contrasting yellow and black markings, they grow larger, and have longer developmental periods. The adults are larger with different body proportions, less sexual dimorphism, and higher metabolic rates. They mature more rapidly and start reproducing earlier, but have lower levels of fecundity.
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.
Several species of grasshoppers swarm as locusts in different parts of the world, on all continents except Antarctica and North America:For example, the Australian plague locust (Chortoicetes terminifera) swarms across Australia.
The desert locust (Schistocerca gregaria) is probably the best known species owing to its wide distribution (North Africa, Middle East, and Indian subcontinent)and its ability to migrate over long distances. A major infestation covered much of western Africa in 2003-4, 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. Swarms crossed Africa, appearing in Egypt, Jordan and Israel, the first time in those countries for 50 years. The cost of handling the infestation was put at US$122 million, and the damage to crops at up to $2.5 billion.
The migratory locust (Locusta migratoria), sometimes classified into up to 10 subspecies, swarms in Africa, Asia, Australia, and New Zealand, but has become rare in Europe.In 2013, the Madagascan form of the migratory locust formed many swarms of over a billion insects, reaching "plague" status and covering about half the country by March 2013. Species such as the Senegalese grasshopper (Oedaleus senegalensis) and the African rice grasshopper (Hieroglyphus daganensis), both from the Sahel, often display locust-like behaviour and change morphologically on crowding.
North America is currently the only continent besides Antarctica without a native locust species. The Rocky Mountain locust was formerly one of the most significant insect pests there, but it became extinct in 1902. In the 1930s, during the Dust 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.
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, and a devastating plague is mentioned in the Book of Exodus in the Bible, as taking place in Egypt around 1446 BC.The Iliad mentions locusts taking to the wing to escape fire. Plagues of locusts are also mentioned in the Quran. In the ninth century BC, the Chinese authorities appointed anti-locust officers.
Aristotle studied locusts and their breeding habits and Livy recorded a devastating plague in Capua in 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 of rats (and their fleas) that devoured the locust carcases.
During the last two millennia, locust plagues continued to appear at irregular intervals with the main recorded outbreaks of the desert and migratory locusts occurring in Africa, the Middle East, and Europe. Other species of locusts caused havoc in North and South America, Asia, and Australasia; 173 outbreaks over a period of 1924 years have been recorded in China.The Bombay 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.
In the spring of 1747 locusts arrived outside Damascus eating 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!"
The extinction of the Rocky Mountain locust has 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 swarm of 1875 was estimated to cover 198,000 square miles (510,000 km2) (greater than the area of California) and to weigh 27.5 million tons, with some 12.5 trillion insects. The last specimen was seen alive in Canada in 1902. Recent research suggests the breeding grounds of this insect in the valleys of the Rocky Mountains came under sustained agricultural development during the large influx of gold miners, destroying the underground eggs of the locust.
Early intervention is a more successful means of dealing with locusts than later action when swarms have already built up. The technology to control locust populations is now available, but the organisational, financial, and political problems may be difficult to overcome. Monitoring is the key to reducing damage, with the early detection and eradication of bands being the objective. Ideally, a sufficient proportion of nomadic bands can be treated with insecticide before the swarming phase is reached. Reaching this objective may be possible in richer countries like Morocco and Saudi Arabia, but neighbouring poorer countries (Mauritania, Yemen, etc.) lack the resources and may act as a source of locust swarms that threaten the whole region.
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 the Australian Plague Locust Commission.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. In Central and Southern Africa, the service is provided by the International Locust Control Organization for Central and Southern Africa. In West and Northwest Africa, the service is co-ordinated by the Food 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. The FAO also monitors the situation in the Caucasus and Central Asia, where over 25 million hectares of cultivated land are under threat. 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.
Historically, people could do little to protect their crops from being devastated by locusts, although eating the insects may have been some consolation. By the early 20th century, efforts were being 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.By the 1950s, the organochloride dieldrin was found to be an extremely effective insecticide, but it was later banned from use in most countries because of its persistence in the environment and its bioaccumulation in the food chain.
In years when locust control is needed, the hoppers are targeted early by applying water-based, contact pesticides using tractor-based sprayers. This is effective but slow and labour-intensive, and where possible, spraying concentrated insecticide solutions from aircraft over the insects or the vegetation on which they feed is preferable.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. Other modern technologies used for planning locust control include GPS, GIS tools, and satellite imagery, and computers provide rapid data management and analysis.
A biological pesticide to control locusts was tested across Africa by a multinational team in 1997.Dried fungal spores of a Metarhizium acridum sprayed in breeding areas pierce the locust exoskeleton on germination and invade the body cavity, causing death. The fungus is passed from insect to insect and persists in the area, making repeated treatments unnecessary. 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 and the elephants, hippopotamuses, and giraffes present in the area were unharmed.
The ultimate goal in locust control is the use of preventive and proactive methods that disrupt the environment to the least possible extent. This would make agricultural production easier and more secure in the many regions where growing crops is of vital importance to the survival of the local people.
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 discover to what degree conclusions reached about other organisms, such as the fruit fly (Drosophila) and the housefly (Musca), are applicable to all insects.It is a suitable school laboratory animal because of its robustness and the ease with which it can be grown and handled.
Locusts are edible insects. Several cultures throughout the world consume insects, and locusts are considered a delicacy and eaten in many African, Middle Eastern, and Asian countries. They have been used as food throughout history.
They can be cooked in many ways, but are often fried, smoked, or dried. : ἀκρίδες καὶ μέλι ἄγριον, romanized: akrides kai meli agrion) while living in the wilderness. Attempts have been made to explain the locusts as some ascetic vegetarian food such as carob beans, but the plain meaning of akrides is the insects.The Bible records that John the Baptist ate locusts and wild honey (Greek
The Torah, although disallowing the use of most insects as food, permits the consumption of certain locusts; specifically, the red, the yellow, the spotted grey, and the white are considered permissible.In Islamic jurisprudence, eating locusts is considered halal. The Islamic prophet, Muhammad, was reported to have eaten locusts during a military raid with his companions.
Locusts are eaten in the Arabian Peninsula, including Saudi Arabia,where consumption of locusts spiked around Ramadan especially in the Al-Qassim Region in 2014, since many Saudis believe they are healthy to eat. The Saudi Ministry of Health warned that pesticides they used against the locusts made them unsafe. Yemenis also consume locusts, and expressed discontent over governmental plans to use pesticides to control them. ʻAbd al-Salâm Shabînî described a locust recipe from Morocco. 19th century European travellers observed Arabs in Arabia, Egypt, and Morocco selling, cooking, and eating locusts. They reported that in Egypt and Palestine locusts were consumed. They reported 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.
In the Haouran region, Fellahs who were in poverty and suffered from famine ate locusts after removing the guts and head, while locusts were swallowed wholesale by Bedouins. : عرب ملخ خور, literally Arab locust eater) against Arabs.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. Persians use the Anti-Arab racial slur "Arabe malakh-khor" (Persian
Locusts yield about five times more edible protein per unit of fodder than cattle, and produce lower levels of greenhouse gases in the process. kg/kg, while for beef it is typically about 10 kg/kg. The protein content in fresh weight is between 13–28 g/100g for adult locust, 14–18 g/100g for larvae, as compared to 19–26 g/100g for beef. The calculated protein efficiency ratio is low, with 1.69 for locust protein compared to 2.5 for standard casein. 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. Among the fatty acids, palmitoleic, oleic and linolenic acids were found to be the most abundant. Varying amounts of potassium, sodium, phosphorus, calcium, magnesium, iron, and zinc were present.The feed conversion rate of orthopterans is 1.7
Orthoptera is an order of insects that comprises the grasshoppers, locusts and crickets, including closely related insects such as the katydids and wetas. The order is subdivided into two suborders: Caelifera – grasshoppers, locusts and close relatives; and Ensifera – crickets and close relatives.
The Rocky Mountain locust is an extinct species of locust that ranged through the western half of the United States and some western portions of Canada with large numbers seen until the end of the 19th century. Sightings often placed their swarms in numbers far larger than any other locust species, with one famous sighting in 1875 estimated at 198,000 square miles (510,000 km2) in size, weighing 27.5 million tons and consisting of some 12.5 trillion insects, the greatest concentration of animals ever speculatively guessed, according to Guinness World Records.
Grasshoppers are a group of insects belonging to the suborder Caelifera. They are among what is probably the most ancient living group of chewing herbivorous insects, dating back to the early Triassic around 250 million years ago.
The desert locust is a species of locust, a swarming short-horned grasshopper in the family Acrididae.
The migratory locust is the most widespread locust species, and the only species in the genus Locusta. It occurs throughout Africa, Asia, Australia and New Zealand. It used to be common in Europe but has now become rare there. Because of the vast geographic area it occupies, which comprises many different ecological zones, numerous subspecies have been described. However, not all experts agree on the validity of some of these subspecies.
In 2004, West and North Africa experienced their largest infestation of locusts in more than 15 years. A number of countries in the fertile northern regions of Africa were affected.
The red locust is a large grasshopper species found in Sub-Saharan Africa. Its name refers to the colour of its hindwings. It is sometimes called the Criquet nomade in French, due to its nomadic movements in the dry season. When it forms swarms, it is described as a locust.
Kosher locusts are varieties of locust deemed permissible for consumption under the laws of kashrut. While the consumption of most insects is forbidden under the laws of kashrut, the rabbis of the Talmud identified eight kosher species of locust. However, the identity of those species is in dispute.
Schistocerca is a genus of grasshoppers, commonly called bird grasshoppers, many of which swarm as locusts. The best known species is probably the desert locust. Around 50 other species are described.
The Australian plague locust is a native Australian insect in the family Acrididae, and a significant agricultural pest.
Metarhizium acridum is the new name given to a group of fungal isolates that are known to be virulent and specific to the Acrididea (grasshoppers). Previously, this species has had variety status in Metarhizium anisopliae ; before that, reference had been made to M. flavoviride or Metarhizium sp. describing an "apparently homologous and distinctive group" of isolates that were most virulent against Schistocerca gregaria in early screening bioassays.
Dociostaurus maroccanus, commonly known as the Moroccan locust, is a grasshopper in the insect family Acrididae. It is found in northern Africa, southern and eastern Europe and western Asia. It lives a solitary existence but in some years its numbers increase sharply, and it becomes gregarious and congregates to form swarms which can cause devastation in agricultural areas. The species was first described by Carl Peter Thunberg in 1815.
In 2012, Madagascar had an upsurge in the size of its Malagasy migratory locust populations. In November of that year, the government issued a locust alert, saying that conditions were right for swarming of the pest insects. In February 2013, Cyclone Haruna struck the country, creating optimal conditions for locust breeding. By late March 2013, approximately 50% of the country was infested by swarms of locusts, with each swarm consisting of more than one billion insects. The authorities changed the situation to plague status. According to one eyewitness,"You don't see anything except locusts. You turn around, there are locusts everywhere".
Schistocerca americana is a species of grasshopper in the family Acrididae known commonly as the American grasshopper and American bird grasshopper. It is native to North America, where it occurs in the eastern United States, Mexico, and the Bahamas. Occasional, localized outbreaks of this grasshopper occur, and it is often referred to as a locust, though it lacks the true swarming form of its congener, the desert locust.
Locusta migratoria manilensis, commonly known as the Oriental migratory locust, is a subspecies of the migratory locust in the family Acrididae. It is sufficiently different in size and structure from the African migratory locust to be considered a distinct subspecies of the migratory locust. It is found in southeastern Asia and is an important agricultural pest in the region. It is normally a solitary insect but when conditions are suitable, it enters into a gregarious phase when the young form into bands which move together and the adults into swarms. Although outbreaks may have recently been fewer in number and size because of changes in agricultural practices and better locust detection, the insects remain active as crop pests and the potential for outbreaks is still present.
Locusta migratoria migratorioides, commonly known as the African migratory locust, is a subspecies of the migratory locust in the family Acrididae.
Anacridium moestum, the camouflaged tree locust, is a species of grasshopper belonging to the family Acrididae, that is native to Africa south of the equator. It is similar in appearance to the Southern African desert locust, Schistocerca gregaria subsp. flavicentris. It is likewise brownish, large and slender, but mostly arboreal in its habits.
The Desert Locust Control Organization for Eastern Africa (DLCO-EA) is "a regional pest and vector management organization established by an International Convention signed in Addis Ababa, Ethiopia in 1962". The Desert Locust Control Organisation for Eastern Africa (DLCO-EA) is a regional organization for integrated pest and vector management to ensure food security in Eastern Africa Region. The Headquarters are in Addis-Ababa, Ethiopia; with each member country having a Control Reserve Base (CRB) and a Base Manager (MG) that represents the Organization at Country level. The DLCO-EA was established by an International Convention signed in Addis Ababa, Ethiopia in 1962, and is registered with the United Nations (UN). This followed the Desert Locusts plagues of the 1940s that left massive hunger and deaths across the Region, and the recommendation, in October 1961 by the 3rd session of Food and Agriculture Organization (FAO) Eastern Africa Desert Locust Control Sub-committee, for its establishment. The desert locusts breed in the Sahel region of Africa and migrate to the rest of the World when food resources are exhausted within the breeding areas. Following the successful management of the locusts, resulting into Uganda, Kenya, and Tanzania being free from attacks for many years, the DLCO-EA mandate was extended to include other migratory pests such as the African Armyworm moth, the grain-eating and destroying birds and Tsetse flies, vectors of nagana and sleeping sickness.
Yelseti Ramachandra Rao was an Indian entomologist and a pioneer in the study and management of the desert locust.
And Moses stretched forth his rod over the land of Egypt, and the Lord brought an east wind upon the land all that day, and all that night; and when it was morning, the east wind brought the locusts. 14 And the locust went up over all the land of Egypt, and rested in all the coasts of Egypt: very grievous were they; before them there were no such locusts as they, neither after them shall be such. 15 For they covered the face of the whole earth, so that the land was darkened; and they did eat every herb of the land, and all the fruit of the trees which the hail had left: and there remained not any green thing in the trees, or in the herbs of the field, through all the land of Egypt.
The relative size and robustness of the locust make it simple to handle and ideal for such investigations.
There is no reason, however, to question the plausibility of Mark 1:6c, that John regularly ate these foods while in the wilderness.
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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