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79-452: Mtwara Region is home for being the nation's largest producer of Cashew nuts. According to the 2012 national census, the region had a population of 1,270,854, which was lower than the pre-census projection of 1,374,767. For 2002-2012, the region's 1.2 percent average annual population growth rate was the 26th highest in the country. It was also the fourteenth most densely populated region with 76 people per square kilometer. The native peoples of

158-661: A Bantu language closely related to Yao . Many speak other languages such as English in Tanzania, Portuguese in Mozambique, and Swahili and Makua in both countries. The Makonde are traditionally a matrilineal society where children and inheritances belong to women, and husbands move into the village of their wives. Their traditional religion is an animistic form of ancestor worship and still continues, although Makonde of Tanzania are nominally Muslim and those of Mozambique are Catholic or Muslim. In Makonde rituals, when

237-555: A cassava plant is the root. This is long and tapered, with an easily detached rough brown rind. The white or yellowish flesh is firm and even in texture. Commercial cultivars can be 5 to 10 centimetres (2 to 4 in) wide at the top, and some 15 to 30 cm (6 to 12 in) long, with a woody vascular bundle running down the middle. The tuberous roots are largely starch , with small amounts of calcium (16 milligrams per 100 grams), phosphorus (27 mg/100 g), and vitamin C (20.6 mg/100 g). Cassava roots contains little protein , whereas

316-425: A famine reserve and is invaluable in managing labor schedules. It offers flexibility to resource-poor farmers because it serves as either a subsistence or a cash crop. Worldwide, 800 million people depend on cassava as their primary food staple. Cassava roots, peels and leaves are dangerous to eat raw because they contain linamarin and lotaustralin , which are toxic cyanogenic glycosides . These are decomposed by

395-408: A fine powder and used to make tapioca, a popular starch used to make bubbles, a chewy topping in bubble tea . Alcoholic beverages made from cassava include cauim (Brazil), kasiri (Venezuela, Guyana, Suriname), parakari or kari (Venezuela, Guyana, Surinam), and nihamanchi (South America), A safe processing method known as the "wetting method" is to mix the cassava flour with water into

474-560: A fungicide, then wrapping in plastic, freezing, or applying a wax coating. While alternative methods for controlling post-harvest deterioration have been proposed, such as preventing reactive oxygen species effects by using plastic bags during storage and transport, coating the roots with wax, or freezing roots, such strategies have proved to be economically or technically impractical, leading to breeding of cassava varieties with improved durability after harvest, achieved by different mechanisms. One approach used gamma rays to try to silence

553-522: A gene involved in triggering deterioration; another strategy selected for plentiful carotenoids , antioxidants which may help to reduce oxidization after harvest. Cassava is subject to pests from multiple taxonomic groups, including nematodes, and insects, as well as diseases caused by viruses, bacteria, and fungi. All cause reductions in yield, and some cause serious losses of crops. Several viruses cause enough damage to cassava crops to be of economic importance. The African cassava mosaic virus causes

632-472: A girl becomes a woman, Muidini is the best dancer out of the group of girls undergoing the rituals. The Makonde are best known for their wood carvings, primarily made of blackwood ( Dalbergia melanoxylon , or mpingo), and their observances of puberty rites. Some Makonde people from Mozambique had relocated to Kenya in the 1950s. Early in the 21st century efforts began to obtain Kenyan identity cards to allow

711-788: A high-yielding form of shifting agriculture by the time of European contact in 1492. Cassava was a staple food of pre-Columbian peoples in the Americas and is often portrayed in indigenous art . The Moche people often depicted cassava in their ceramics. Spaniards in their early occupation of Caribbean islands did not want to eat cassava or maize, which they considered insubstantial, dangerous, and not nutritious. They much preferred foods from Spain, specifically wheat bread, olive oil, red wine, and meat, and considered maize and cassava damaging to Europeans. The cultivation and consumption of cassava were nonetheless continued in both Portuguese and Spanish America. Mass production of cassava bread became

790-498: A higher effective yield. The use of tolerant and resistant cultivars is the most practical management method in most locales. Insects such as stem borers and other beetles, moths including Chilomima clarkei , scale insects, fruit flies, shootflies, burrower bugs , grasshoppers, leafhoppers, gall midges, leafcutter ants, and termites contribute to losses of cassava in the field, while others contribute to serious losses, between 19% and 30%, of dried cassava in storage. In Africa ,

869-927: A legend that cassava was introduced in 1880–1885 CE to the South Indian state of Kerala by the King of Travancore , Vishakham Thirunal Maharaja, after a great famine hit the kingdom, as a substitute for rice. However, there are documented cases of cassava cultivation in parts of the state before the time of Vishakham Thirunal Maharaja. Cassava is called kappa or maricheeni in Malayalam , and tapioca in Indian English usage. Optimal conditions for cassava cultivation are mean annual temperatures between 20 and 29 °C (68 and 84 °F), annual precipitation between 1,000 and 2,500 mm (39 and 98 in), and an annual growth period of no less than 240 days. Cassava

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948-399: A myth relates that food derives from the body of Dewi Teknowati, who killed herself rather than accept the advances of the god Batara Guru . She was buried, and her lower leg grew into a cassava plant. In Trinidad, folk stories tell of a saapina or snake-woman; the word is related to sabada , meaning to pound, for what is traditionally a woman's work of pounding cassava. The identity of

1027-478: A previous issue was the cassava mealybug ( Phenacoccus manihoti ) and cassava green mite ( Mononychellus tanajoa ). These pests can cause up to 80 percent crop loss, which is extremely detrimental to the production of subsistence farmers. These pests were rampant in the 1970s and 1980s but were brought under control following the establishment of the Biological Control Centre for Africa of

1106-434: A quarter of this is cultivated. The average farm size per rural home (169,482 households - 1988 Census) is projected to be 1.5 ha, with an average of 4.4 people. Mechanization and oxenization of farms are still developing. In this area, the hand hoe is the most popular agricultural implement. Cassava , millet, and sorghum are all important food crops, with maize only recently gaining popularity. The most important cash crop in

1185-622: A rate of 80 kilometres (50 miles) per year, and as of 2005 was found throughout Uganda, Rwanda, Burundi, the Democratic Republic of the Congo and the Republic of the Congo. Viruses are a severe production limitation in the tropics. They are the primary reason for the complete lack of yield increases in the 25 years up to 2021 . Cassava brown streak virus disease is a major threat to cultivation worldwide. Cassava mosaic virus (CMV)

1264-738: A thick paste, spread it in a thin layer over a basket and then let it stand for five hours at 30 °C in the shade. In that time, about 83% of the cyanogenic glycosides are broken down by linamarase ; the resulting hydrogen cyanide escapes to the atmosphere, making the flour safe for consumption the same evening. The traditional method used in West Africa is to peel the roots and put them into water for three days to ferment. The roots are then dried or cooked. In Nigeria and several other west African countries, including Ghana, Cameroon, Benin, Togo, Ivory Coast, and Burkina Faso, they are usually grated and lightly fried in palm oil to preserve them. The result

1343-429: A thick texture. The second zone extends west of the coastal sediments geologically. Gneisses and granulites make up this zone of pre-cambrian basement rocks. The soils in this basement are diverse. To the north of Masasi town, there are deep, well-drained red clays. These are the best soils in the area since they are most suited to the region's upland crops. Course-grained sandy soils are common south of Masasi. The region

1422-535: A warm welcome. After a well-prepared meal on Thursday 13 October 2016, the President ordered the relevant ministry to provide the Makonde with identity cards by December 2016. The Makonde traditionally have carved wooden household objects, figures and masks for ritual use. After the 1930s, Makonde art has become an important part of the contemporary art of Africa . The most internationally acknowledged such artist

1501-511: Is a foodstuff called garri . Fermentation is also used in other places such as Indonesia, such as Tapai . The fermentation process also reduces the level of antinutrients, making the cassava a more nutritious food. The reliance on cassava as a food source and the resulting exposure to the goitrogenic effects of thiocyanate has been responsible for the endemic goiters seen in the Akoko area of southwestern Nigeria. A traditional method used by

1580-512: Is available on the US market in bottled form. Raw cassava is 60% water, 38% carbohydrates, 1% protein, and has negligible fat (table). In a 100-gram ( 3 + 1 ⁄ 2 -ounce) reference serving, raw cassava provides 670 kilojoules (160 kilocalories) of food energy and 23% of the Daily Value (DV) of vitamin C, but otherwise has no micronutrients in significant content (i.e., above 10% of

1659-546: Is both the most eastern and southern region in the country. The region is located between 10 and 11 degrees south of the Equator. Mtwara is the third smallest region after Dar es Salaam Region and Kilimanjaro Region at 16,710 km (6,450 sq mi), only occupying about 1.9% of the country. In comparison, Mtwara is slightly smaller than the African nation of Eswatini at 17,230 square kilometers. Mtwara's central area

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1738-484: Is grown in sweet and bitter varieties; both contain toxins, but the bitter varieties have them in much larger amounts. Cassava has to be prepared carefully for consumption, as improperly prepared material can contain sufficient cyanide to cause poisoning . The more toxic varieties of cassava have been used in some places as famine food during times of food insecurity . Farmers may however choose bitter cultivars to minimise crop losses. The generic name Manihot and

1817-434: Is harvested at three to four month, when it reaches about 30 to 45 cm (12 to 18 in) above ground; it is dried in the sun until its dry matter content approaches 85 percent. The hay contains 20–27 percent protein and 1.5–4 percent tannin . It is valued as a source of roughage for ruminants such as cattle. Cassava is used in laundry products, especially as starch to stiffen shirts and other garments. In Java,

1896-448: Is mostly for export and predictably, only a small portion of the yield is consumed. The Mtwara Region is officially recognized as the country's leading cashew nut grower, producing roughly half of the country's output. Newala district produces more over half of the region's cashewnut harvest. Masasi comes in second with a 29 percent contribution, and Mtwara district comes in last with a 19 percent average contribution. The mining industry in

1975-898: Is of high elevation, home to the Makonde plateau with Mtwara Region's highest point being Masasi peak at 837 meters above sea level. The largest and longest river in Mtwara Region is the Ruvuma River which is fed by the Mbangala River within the region as one of Ruvuma's many tributaries. The rainy season, which runs from November/December to April/May, has only one peak. The storm's peak typically occurs in January, but may also occur in February or March. The overall amount of annual precipitation varies with altitude. Rainfall in

2054-406: Is predominantly consumed in boiled form, but substantial quantities are processed to extract cassava starch, called tapioca , which is used for food, animal feed, and industrial purposes. The Brazilian farofa , and the related garri of West Africa, is an edible coarse flour obtained by grating cassava roots, pressing moisture off the obtained grated pulp, and finally drying it (and roasting in

2133-414: Is propagated by cutting the stem into sections of approximately 15 cm (5.9 in), these being planted prior to the wet season. Cassava growth is favorable under temperatures ranging from 25 to 29 °C (77 to 84 °F), but it can tolerate temperatures as low as 12 °C (54 °F) and as high as 40 °C (104 °F). These conditions are found, among other places, in the northern part of

2212-527: Is separated into two sections in terms of topography. The coastal plain's landforms are complicated. Second, at 300mm to 400mm, the Makonde Plateau dominates the basement plain. It's mostly low-lying, with scattered rocky outcroppings and steep riverbanks. The western part, which is beyond the Makonde Plateau, flows to the south via the Ruvuma River's tributaries. The Makonde Plateau is drained by

2291-560: Is sometimes described as the "bread of the tropics" but should not be confused with the tropical and equatorial bread tree (Encephalartos) , the breadfruit (Artocarpus altilis) or the African breadfruit (Treculia africana) . This description definitely holds in Africa and parts of South America; in Asian countries such as Vietnam fresh cassava barely features in human diets. There is

2370-476: Is sufficient to eliminate all toxicity. The cyanide is carried away in the processing water and the amounts produced in domestic consumption are too small to have environmental impact. The larger-rooted, bitter varieties used for production of flour or starch must be processed to remove the cyanogenic glucosides. The large roots are peeled and then ground into flour, which is then soaked in water, squeezed dry several times, and toasted. The starch grains that flow with

2449-633: Is sufficient to kill a rat. Excess cyanide residue from improper preparation causes goiters and acute cyanide poisoning, and is linked to ataxia (a neurological disorder affecting the ability to walk, also known as konzo ). It has also been linked to tropical fibrocalcific pancreatitis in humans, leading to chronic pancreatitis. Symptoms of acute cyanide intoxication appear four or more hours after ingesting raw or poorly processed cassava: vertigo, vomiting, goiter , ataxia , partial paralysis, collapse, and death. It can be treated easily with an injection of thiosulfate (which makes sulfur available for

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2528-483: Is vital when productivity has declined due to pests and diseases , and smallholders tend to retain less productive but more diverse gene pools . MeFT1 (FT) is a gene producing FT proteins which affect the formation of storage roots in many plants, including this one. Alleles in cassava include MeFT1 and MeFT2 . MeFT1 expression in leaves seems to not be photoperiodic , while MeFT2 clearly is. MeFT1 expression encourages motivation of sucrose towards

2607-410: Is widespread in Africa, causing cassava mosaic disease (CMD). Bredeson et al. 2016 find the M. esculenta cultivars most widely used on that continent have M. carthaginensis subsp. glaziovii genes of which some appear to be CMD resistance genes . Although the ongoing CMD pandemic affects both East and Central Africa, Legg et al. found that these two areas have two distinct subpopulations of

2686-614: The Gulf Coastal Plain in Mexico. In this part of Mexico the following soil types have been shown to be good for cassava cultivation: phaeozem , regosol , arenosol , andosol and luvisol . Before harvest, the leafy stems are removed. The harvest is gathered by pulling up the base of the stem and cutting off the tuberous roots. Cassava deteriorates after harvest, when the tuberous roots are first cut. The healing mechanism produces coumaric acid , which oxidizes and blackens

2765-513: The International Institute of Tropical Agriculture (IITA) under the leadership of Hans Rudolf Herren . The Centre investigated biological control for cassava pests; two South American natural enemies Anagyrus lopezi (a parasitoid wasp) and Typhlodromalus aripo (a predatory mite) were found to effectively control the cassava mealybug and the cassava green mite, respectively. In 2022, world production of cassava root

2844-510: The Lucayans to detoxify cassava is by peeling, grinding, and mashing; filtering the mash through a basket tube to remove the hydrogen cyanide; and drying and sieving the mash for flour. The poisonous filtrate water was boiled to release the hydrogen cyanide, and used as a base for stews. Bioengineering has been applied to grow cassava with lower cyanogenic glycosides combined with fortification of vitamin A , iron and protein to improve

2923-480: The Macushi people of Guyana is closely bound up with the growth and processing of cassava in their slash-and-burn subsistence lifestyle. A story tells that the great spirit Makunaima climbed a tree, cutting off pieces with his axe; when they landed on the ground, each piece became a type of animal. The opossum brought the people to the tree, where they found all the types of food, including bitter cassava. A bird told

3002-513: The Mueda Plateau in Mozambique. At present they live throughout Tanzania and Mozambique, and have a small presence in Kenya . The Makonde population in Tanzania was estimated in 2001 to be 1,140,000, and the 1997 census in Mozambique put the Makonde population in that country at 233,358, for an estimated total of 1,373,358. The ethnic group is roughly divided by the Ruvuma River ; members of

3081-657: The vector , Bemisia tabaci whiteflies. Genetically engineered cassava offers opportunities for the improvement of virus resistance, including CMV and CBSD resistance. Among the most serious bacterial pests is Xanthomonas axonopodis pv. manihotis , which causes bacterial blight of cassava . This disease originated in South America and has followed cassava around the world. Bacterial blight has been responsible for near catastrophic losses and famine in past decades, and its mitigation requires active management practices. Several other bacteria attack cassava, including

3160-676: The 16th century. Around the same period, it was introduced to Asia through Columbian Exchange by Portuguese and Spanish traders, who planted it in their colonies in Goa, Malacca, Eastern Indonesia, Timor and the Philippines. Cassava has also become an important crop in Asia. While it is a valued food staple in parts of eastern Indonesia, it is primarily cultivated for starch extraction and bio-fuel production in Thailand, Cambodia and Vietnam. Cassava

3239-581: The Caribbean when temperature and rainfall are high. Nematode pests of cassava are thought to cause harms ranging from negligible to seriously damaging, making the choice of management methods difficult. A wide range of plant parasitic nematodes have been reported associated with cassava worldwide. These include Pratylenchus brachyurus , Rotylenchulus reniformis , Helicotylenchus spp., Scutellonema spp. and Meloidogyne spp., of which Meloidogyne incognita and Meloidogyne javanica are

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3318-474: The HiFi genome assembly revealed extensive chromosome rearrangements and abundant intra-genomic and inter-genomic divergent sequences, with significant structural variations mostly related to long terminal repeat retrotransposons. Although smallholders are otherwise economically inefficient producers, they are vital to productivity at particular times. Small cassava farmers are no exception. Genetic diversity

3397-522: The Makonde to exercise their rights and privileges as Kenyan citizens. In 2016, a group of 300 Makonde people trekked from Kwale to Nairobi. The group was led by Diana Gichengo an inclusions activist and accompanied by other human rights supportive stakeholders. They headed to the State House in Nairobi to persuade the President to push their recognition as Kenyan citizens. President Kenyatta gave them

3476-454: The Maombi and Mbuo rivers. Mtwara, like the rest of Tanzania, is mostly a farming community. Farming is the main source of income for the region's residents. Agribusiness employs over 92 percent of the population, in addition to other rural activities such as fishing, beekeeping, and small-scale manufacturing. Arable land makes up about 85 percent of the region's total area. However, only about

3555-501: The Masasi district. Mtwara Region is divided into two towns (Mtwara Municipal and Masasi Town) and seven districts , each administered by a council: 2022-2027 (Ambassador of Mtwara) Makonde people Majority Islam Minority Ancestor Worship In Mozambique: Majority Christianity The Makonde are an ethnic group in southeast Tanzania , northern Mozambique , and Kenya . The Makonde developed their culture on

3634-725: The Mtwara Region are the Makonde , the Yao and the Makua . The Makonde are the dominant ethnic group in Mtwara Region and are native to east and central Mtwara, specifically in Mtwara-Mikindani District, Mtwara District, Newala, and Tandahimba districts. As of 1967, the Makonde made up 60% of the region. The second-largest group in terms of the territory is the Makua people, who are native to Nanyumbu and Masasi Districts. The Yao are native to parts of Tandahimba District. Since 1988,

3713-890: The Mtwara district ranges from 935 mm to 1160 mm in the highlands and plateau. At Masasi Mission, the rainfall is 893 mm, whereas at Newala, it is 1001 mm. It also ranges between Mtopwa and Lukwika Mission, ranging from 1133 mm to 832 mm. Similarly, the highest monthly mean temperature at Mtwara on the seashore in December is 27 degrees Celsius, while the lowest monthly mean temperature is 23 degrees Celsius in July. In Mtwara, relative humidity ranges from 87 percent in March to 79 percent in October. Inland, temperatures and humidity are lower. Soils are determined by geology. There are two geological zones in

3792-404: The area is cashew nuts, followed by groundnuts and sesame. Because livestock rearing is not a common practice among the people of the region, its economic contribution is negligible. The cashew nut crop, which accounts for about 25% of the region's GDP, is one of Mtwara's significant contributors. The Mtwara Region produces 40% of the country's cashew nut production. Tanzanian cashew nut production

3871-469: The bitter varieties containing much larger amounts. The more toxic varieties of cassava have been used in some places as famine food during times of food insecurity . For example, during the shortages in Venezuela in the late 2010s, dozens of deaths were reported due to Venezuelans resorting to eating bitter cassava in order to curb starvation. Cases of cassava poisoning were also documented during

3950-435: The case of both farofa and garri ). Cassava is the third-largest source of carbohydrates in food in the tropics, after rice and maize , making it an important staple ; more than 500 million people depend on it. It offers the advantage of being exceptionally drought-tolerant , and able to grow productively on poor soil. The largest producer is Nigeria, while Thailand is the largest exporter of cassava starch. Cassava

4029-538: The cassava enzyme linamarase , releasing poisonous hydrogen cyanide . Cassava varieties are often categorized as either bitter (high in cyanogenic glycosides) or sweet (low in those bitter compounds). Sweet cultivars can contain as little as 20 milligrams of cyanide per kilogram of fresh roots, whereas bitter cultivars may contain as much as 1000 milligrams per kilogram. Cassavas grown during drought are especially high in these toxins. A dose of 25 mg of pure cassava cyanogenic glucoside, which contains 2.5 mg of cyanide,

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4108-512: The common name "manioc" both derive from the Guarani (Tupi) name mandioca or manioca for the plant. The specific name esculenta is Latin for 'edible'. The common name "cassava" is a 16th century word from the French or Portuguese cassave , in turn from Taíno caçabi . The common name "yuca" or "yucca" is most likely also from Taíno, via Spanish yuca or juca . The harvested part of

4187-671: The equator, where it can be produced at up to 2,000 m (7,000 ft) above sea level, and with 50 to 5,000 mm (2 to 200 in) of rain per year. These environmental tolerances suit it to conditions across much of South America and Africa. Cassava yields a large amount of food energy per unit area of land per day – 1,000,000 kJ/ha (250,000 kcal/ha), as compared with 650,000 kJ/ha (156,000 kcal/ha) for rice, 460,000 kJ/ha (110,000 kcal/ha) for wheat and 840,000 kJ/ha (200,000 kcal/ha) for maize. Cassava, yams ( Dioscorea spp.), and sweet potatoes ( Ipomoea batatas ) are important sources of food in

4266-626: The famine accompanying the Great Leap Forward (1958–1962) in China. Farmers may select bitter cultivars to reduce crop losses. Societies that traditionally eat cassava generally understand that processing (soaking, cooking, fermentation, etc.) is necessary to avoid getting sick. Brief soaking (four hours) of cassava is not sufficient, but soaking for 18–24 hours can remove up to half the level of cyanide. Drying may not be sufficient, either. For some smaller-rooted, sweet varieties, cooking

4345-524: The first Cuban industry established by the Spanish. Ships departing to Europe from Cuban ports such as Havana , Santiago , Bayamo , and Baracoa carried goods to Spain, but sailors needed to be provisioned for the voyage. The Spanish also needed to replenish their boats with dried meat, water, fruit, and large amounts of cassava bread. Sailors complained that it caused them digestive problems. Portuguese traders introduced cassava to Africa from Brazil in

4424-422: The flavors and also impart them (even if dry) to foods such as rice and chicken cooked in it. The poisonous but volatile hydrogen cyanide is evaporated by heating. Nevertheless, improperly cooked cassava has been blamed for a number of deaths. Amerindians from Guyana reportedly made an antidote by steeping chili peppers in rum . The natives of Guyana traditionally brought the product to town in bottles, and it

4503-528: The group in Tanzania are referred to as the Makonde, and those in Mozambique as the Maconde . The two groups have developed separate languages over time but share a common origin and culture. The Makonde successfully resisted predation by African, Arab, and European slavers . They did not fall under colonial power until the 1920s. During the 1960s the revolution which drove the Portuguese out of Mozambique

4582-715: The leaves are rich in it, except for being low in methionine , an essential amino acid . The complete and haplotype-resolved African cassava (TME204) genome has been reconstructed and made available using the Hi-C technology. The genome shows abundant novel gene loci with enriched functionality related to chromatin organization, meristem development, and cell responses. Differentially expressed transcripts of different haplotype origins were enriched for different functionality during tissue development. In each tissue, 20–30% of transcripts showed allele-specific expression differences with <2% of direction-shifting. Despite high gene synteny,

4661-463: The leaves of the cassava plant to wither, limiting the growth of the root. An outbreak of the virus in Africa in the 1920s led to a major famine. The virus is spread by the whitefly and by the transplanting of diseased plants into new fields. Sometime in the late-1980s, a mutation occurred in Uganda that made the virus even more harmful, causing the complete loss of leaves. This mutated virus spread at

4740-497: The most widely reported and economically important. Meloidogyne spp. feeding produces physically damaging galls with eggs inside them. Galls later merge as the females grow and enlarge, and they interfere with water and nutrient supply. Cassava roots become tough with age and restrict the movement of the juveniles and the egg release. It is therefore possible that extensive galling can be observed even at low densities following infection. Other pests and diseases can gain entry through

4819-412: The nutrition of people in sub-Saharan Africa. In Guyana the traditional cassareep is made from bitter cassava juice. The juice is boiled until it is reduced by half in volume, to the consistency of molasses and flavored with spices —including cloves , cinnamon , salt , sugar , and cayenne pepper . Traditionally, cassareep was boiled in a soft pot, the actual "pepper pot", which would absorb

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4898-457: The patient's body to detoxify by converting the poisonous cyanide into thiocyanate). Chronic, low-level exposure to cyanide may contribute to both goiter and tropical ataxic neuropathy , also called konzo , which can be fatal. The risk is highest in famines, when as many as 3 percent of the population may be affected. Like many other roots and tubers, both bitter and sweet varieties of cassava contain antinutritional factors and toxins, with

4977-548: The physical damage caused by gall formation, leading to rots. They have not been shown to cause direct damage to the enlarged tuberous roots, but plant height can be reduced if the root system is reduced. Nematicides reduce the numbers of galls per feeder root, along with fewer rots in the tuberous roots. The organophosphorus nematicide femaniphos does not reduce crop growth or harvest yield. Nematicide use in cassava does not increase harvested yield significantly, but lower infestation at harvest and lower subsequent storage loss provide

5056-537: The region has a bright future. On a limited scale, 35 minerals have been discovered and mined. The Masasi District has been mining sapphire , christalbella, alexandrite, tourmaline, and rhodolite since 1995. Mtwara Region is home to the Mnazi Bay-Ruvuma Estuary Marine Park that is one of the largest marine parks in the country. The marine park is a sanctuary for breeding Humpback whales . Forest reserves occupy about 8.33 percent of

5135-787: The region has been facing mass migration as younger people seek economic opportunities in Dar es Salaam creating a vibrant Makonde community in Temeke District of Dar es Dalaam especially in Mbagala , which is named after the Mbagala River located in Mtwara Region. In 1948, the British Government formulated the " Tanganyika groundnut scheme " through the Overseas Food Corporation (OFC). The purpose

5214-415: The region's 1,672,000 ha of land. This area is 139,295 hectares. Masasi district has the greatest amount of forest cover in the region. The central government manages 130,545 hectares of forest reserves. This equates to 93.7 percent. District councils possess another 8,749 hectares, or 6.3 percent of total forest reserves. In total, there are 16 forest reserves in the region. The majority of them are located in

5293-553: The region, resulting in two geologically determined soil types. The first zone is the coastal sedimentary deposit, which stretches 31-125 kilometers from the Indian Ocean to the tip of Newala's Makonde Plateau. Deep, well-drained, sandy soils with poor fertility and moisture holding capacity are produced in this zone. Sandstones are used to make them. Marine heavy clay soils, also known as vertisols, are found in some regions. Coastal limestones also provide red, well-drained soils with

5372-630: The related Xanthomonas campestris pv. cassavae , which causes bacterial angular leaf spot. Several fungi bring about significant crop losses, one of the most serious being cassava root rot; the pathogens involved are species of Phytophthora , the genus which causes potato blight. Cassava root rot can result in losses of as much as 80 percent of the crop. A major pest is a rust caused by Uromyces manihotis . Superelongation disease, caused by Elsinoë brasiliensis , can cause losses of over 80 percent of young cassava in Latin America and

5451-442: The relevant DV). Cassava has been studied as a feedstock to produce ethanol as a biofuel , including to improve the efficiency of conversion from cassava flour, and to convert crop residues such as stems and leaves as well as the more easily processed roots. China has created facilities to produce substantial amounts of ethanol fuel from cassava roots. Cassava tubers and hay are used worldwide as animal feed. Young cassava hay

5530-410: The reproductive organs, as shown by experimental overexpression reducing storage root accumulation. Wild populations of M. esculenta subspecies flabellifolia , shown to be the progenitor of domesticated cassava, are centered in west-central Brazil, where it was likely first domesticated no more than 10,000 years ago. Forms of the modern domesticated species can also be found growing in the wild in

5609-488: The roots, making them inedible after a few days. This deterioration is related to the accumulation of reactive oxygen species initiated by cyanide release during mechanical harvesting. Cassava shelf life may be increased up to three weeks by overexpressing a cyanide-insensitive alternative oxidase, which suppressed ROS by 10-fold. Post-harvest deterioration is a major obstacle to the export of cassava. Fresh cassava can be preserved like potato, using thiabendazole or bleach as

5688-702: The south of Brazil. By 4600 BC, cassava pollen appears in the Gulf of Mexico lowlands, at the San Andrés archaeological site. The oldest direct evidence of cassava cultivation comes from a 1,400-year-old Maya site, Joya de Cerén , in El Salvador . It became a staple food of the native populations of northern South America, southern Mesoamerica, and the Taino people in the Caribbean islands , who grew it using

5767-465: The sweet variety is mild to the taste, like potatoes; Jewish households sometimes use it in cholent . It can be made into a flour that is used in breads, cakes and cookies. In Brazil, farofa , a dry meal made from cooked powdered cassava, is roasted in butter, eaten as a side dish, or sprinkled on other food. In Taiwanese culture, now spread to the United States, cassava "juices" are dried to

5846-446: The tropics. The cassava plant gives the third-highest yield of carbohydrates per cultivated area among crop plants, after sugarcane and sugar beets . Cassava plays a particularly important role in agriculture in developing countries, especially in sub-Saharan Africa , because it does well on poor soils and with low rainfall, and because it is a perennial that can be harvested as required. Its wide harvesting window allows it to act as

5925-419: The water during the soaking process are also used in cooking. The flour is used throughout South America and the Caribbean . Industrial production of cassava flour, even at the cottage level, may generate enough cyanide and cyanogenic glycosides in the effluents to have a severe environmental impact. There are many ways of cooking cassava . It has to be prepared correctly to remove its toxicity. The root of

6004-508: Was George Lilanga . Cassava Manihot esculenta , commonly called cassava , manioc , or yuca (among numerous regional names), is a woody shrub of the spurge family, Euphorbiaceae , native to South America, from Brazil, Paraguay and parts of the Andes. Although a perennial plant, cassava is extensively cultivated in tropical and subtropical regions as an annual crop for its edible starchy tuberous root. Cassava

6083-469: Was 330 million tonnes, led by Nigeria with 18% of the total (table). Other major growers were Democratic Republic of the Congo and Thailand. Cassava is the third-largest source of carbohydrates in food in the tropics, after rice and maize . making it an important staple; more than 500 million people depend on it. It offers the advantage of being exceptionally drought-tolerant , and able to grow productively on poor soil. Cassava grows well within 30° of

6162-451: Was launched from the Makonde homeland of the Mueda Plateau . For a time the revolutionary movement FRELIMO derived some of its financial support from the sale of Makonde carvings, and the group became the backbone of the revolutionary movement. The Maconde of Mozambique, due to their role in the resistance to Portuguese colonial rule, remain an influential group in the politics of the country. They speak Makonde , also known as ChiMakonde,

6241-443: Was to alleviate the worldwide shortage of vegetable oils. However, inadequate research and adverse environmental conditions due to poor planning resulted in the complete and disastrous failure of the scheme. In this region, the exported crop was to go through the port of Mtwara. This port was created for the scheme; it was linked to the growing areas near Nachingwea by a new railway. Mtwara was part of Lindi Region until 1971. Mtwara

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