Meloidogyne enterolobii | |
---|---|
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Nematoda |
Class: | Secernentea |
Order: | Tylenchida |
Family: | Heteroderidae |
Genus: | Meloidogyne |
Species: | M. enterolobii |
Binomial name | |
Meloidogyne enterolobii Yang & Eisenback, 1983 | |
Synonyms [1] | |
Meloidogyne mayaguensisRammah & Hirschmann, 1988 |
Meloidogyne enterolobii was originally described from a population collected from the pacara earpod tree (Enterolobium contortisiliquum (Vell.) Morong) in China in 1983. [2] In 2001 it was reported for the first time in the continental USA in Florida. [3] M. enterolobii is now considered one of the most important root-knot nematode species because of its ability of reproducing on root-knot nematode-resistant (Mi-1 gene carrying genotypes) bell pepper and other economically important crops. [4]
M. enterolobii, a sedentary endoparasite, has very similar morphology as other species of Meloidogyne . The perineal patterns, male stylet length values (smaller for M. enterolobii than M. incognita) and J2 tail length values (greater for M. enterolobii than M. incognita) of M. enterolobii isolates from Florida are useful morphological characters for the separation of M. enterolobii from M. incognita. Other methods such as enzyme analyses and DNA analysis also have been performed to identify M. enterolobii from other Meloidogyne species. [5] [6] [7]
M. enterolobii is an apomictic species of root-knot nematodes. [8]
M. enterolobii is a tropical or subtropical species reported in Australia, Brazil, Venezuela, China, Cuba, France, Guatemala, Puerto Rico, Martinique, Malawi, Senegal, South Africa, Switzerland, Trinidad and Tobago, United States, and West Africa (Ivory Coast and Burkina Faso). [5]
It has a variety of hosts, such as eggplant (Solanum melongena), bell pepper (Capsicum annuum), soybean (Glycine max), sweet potato (Ipomoea batatas), tobacco (Nicotiana tabacum), tomato (Lycopersicon esculentum), watermelon (Citrullus lanatus). [9]
The most efficient control method is preplant soil fumigation with methyl bromide (Mbr). That can reduce the M. incognita reproduction by almost 100%. [10] However, the soil fumigant methyl bromide has been phased out in 2005 because of its negative effects on the ozone layer. A 1995 economic study declared that banning methyl bromide without an alternative method of controlling nematodes would cost the nation's bell pepper industry $127 million in losses. [11]
Some Mbr alternatives have been tested, such as Metham sodium plus chloropicrin (Mna+Pic) and 1,3-Dichloropropene (1,3-D) plus Pic. Mna+Pic provided equal or better Meloidogyne control than methyl bromide plus pic, for sting nematode, they are equal to MBR plus pic. [12] Other alternative such as Multiguard, which is a formulation of furfural, a compound derived from sugarcane waste, which has been reported to have both nematicidal and antifungal properties. [13]
Nematode-resistant bell pepper cultivar is another method to control nematode population. Two bell pepper cultivars, Carolina Wonder and Charleston Belle, have been widely planted in the United States. [14] However, while these varieties offer resistance to M. incognita, they are susceptible to M. enterolobii.[ citation needed ]
Crop rotation can be used to control M. enterolobii. The root-knot resistant bell peppers are not suggested to be planted in the field all over the seasons because that will select more M. enterolobii, which will survive and become a big population. Meanwhile, less severe yield loss of susceptible bell peppers has been observed when growing them after resistant bell peppers. [15]
Northern root-knot nematode is a species of vegetable pathogens which produces tiny galls on around 550 crop and weed species. They invade root tissue after birth. Females are able to lay up to 1,000 eggs at a time in a large egg mass. By surviving harsh winters, they can survive in cold climates.
Root-knot nematodes are plant-parasitic nematodes from the genus Meloidogyne. They exist in soil in areas with hot climates or short winters. About 2000 plants worldwide are susceptible to infection by root-knot nematodes and they cause approximately 5% of global crop loss. Root-knot nematode larvae infect plant roots, causing the development of root-knot galls that drain the plant's photosynthate and nutrients. Infection of young plants may be lethal, while infection of mature plants causes decreased yield.
Meloidogyne incognita, also known as the southern root-nematode or cotton root-knot nematode is a plant-parasitic roundworm in the family Heteroderidae. This nematode is one of the four most common species worldwide and has numerous hosts. It typically incites large, usually irregular galls on roots as a result of parasitism.
Belonolaimus longicaudatus is a common parasite of grasses and other plant crops and products. It is the most destructive nematode pest of turf grass, and it also attacks a wide range of fruit, vegetable, and fiber crops such as citrus, cotton, ornamentals, and forage. The sting nematode is a migratory ectoparasite of roots. It is well established in many golf courses and presents a problem in turf management. The sting nematode is only present in very sandy soils. It cannot reproduce in heavier or clay soils.
Rotylenchulus reniformis, the reniform nematode, is a species of parasitic nematode of plants with a worldwide distribution in the tropical and subtropical regions.
Meloidogyne arenaria is a species of plant pathogenic nematodes. This nematode is also known as the peanut root knot nematode. The word "Meloidogyne" is derived from two Greek words that mean "apple-shaped" and "female". The peanut root knot nematode, M. arenaria is one of the "major" Meloidogyne species because of its worldwide economic importance. M. arenaria is a predominant nematode species in the United States attacking peanut in Alabama, Florida, Georgia, and Texas. The most damaging nematode species for peanut in the USA is M. arenaria race 1 and losses can exceed 50% in severely infested fields. Among the several Meloidogyne species that have been characterized, M. arenaria is the most variable both morphologically and cytologically. In 1949, two races of this nematode had been identified, race 1 which reproduces on peanut and race 2 which cannot do so. However, in a recent study, three races were described. López-Pérez et al (2011) had also studied populations of M. arenaria race 2, which reproduces on tomato plants carrying the Mi gene and race 3, which reproduces on both resistant pepper and tomato.
Meloidogyne javanica is a species of plant-pathogenic nematodes. It is one of the tropical root-knot nematodes and a major agricultural pest in many countries. It has many hosts. Meloidogyne javanica reproduces by obligatory mitotic parthenogenesis (apomixis).
Meloidogyne acronea, the African cotton root-knot nematode or African cotton root nematode, is a plant pathogenic nematode affecting pigeonpeas. It is also an invasive species. The roots and surrounding soils of cereals, grasses, and Gossypium spp. provide habitat for this organism. M. acronea was confirmed as a potentially problematic pest of cotton, Gossypium hirsutum cv. Makoka, which was proven through pot experiments.
Meloidogyne brevicauda is a plant-parasitic nematode. It is also called tea root-knot nematode, mature tea nematode or Indian root-knot nematode. It is a member of the root-knot nematodes, which was identified by C. A. Loos in 1953 in Sri Lanka.
There are many plant-parasitic species in the root-knot nematode genus (Meloidogyne) that attack coffee such as M. incognita, M. arenaria, M. exigua, M. javanica and M. coffeicola. Study has already shown interspecific variability coffee, in which show how this species can be adapting to new hosts and environments.
Pratylenchus is a genus of nematodes known commonly as lesion nematodes. They are parasitic on plants and are responsible for root lesion disease on many taxa of host plants in temperate regions around the world. Lesion nematodes are migratory endoparasites that feed and reproduce in the root and move around, unlike the cyst or root-knot nematodes, which may stay in one place. They usually only feed on the cortex of the root. Species are distinguished primarily by the morphology of the stylets.
Helicotylenchus is a genus of nematodes in the family Hoplolaimidae. They are known generally as spiral nematodes. They are found worldwide because they can live and survive in a wide range of habitats. They are among the most common parasitic nematodes of plants; found in corn, bananas, grass, soybeans.
Purpureocillium lilacinum is a species of filamentous fungus in the family Ophiocordycipitaceae. It has been isolated from a wide range of habitats, including cultivated and uncultivated soils, forests, grassland, deserts, estuarine sediments and sewage sludge, and insects. It has also been found in nematode eggs, and occasionally from females of root-knot and cyst nematodes. In addition, it has frequently been detected in the rhizosphere of many crops. The species can grow at a wide range of temperatures – from 8 to 38 °C for a few isolates, with optimal growth in the range 26 to 30 °C. It also has a wide pH tolerance and can grow on a variety of substrates. P. lilacinum has shown promising results for use as a biocontrol agent to control the growth of destructive root-knot nematodes.
The Pasteuriaceae are a family of nonmotile Gram-positive bacteria. They are moderately to strongly resistant to heat. Species in this family produce a septate mycelium with one refractile endospore. The mycelium grows bigger on one end to form sporangia and sometimes endospores. The size of the endospores is different for each species of the genus Pasteuria. Species of the family of Pastueriaceae are endoparasitic in plant, soil, and freshwater invertebrates.
Pasteuria is a genus of mycelial and endospore-forming, nonmotile gram-positive bacteria that are obligate parasites of some nematodes and crustaceans. The genus of Pasteuria was previously classified within the family Alicyclobacillaceae, but has since been moved to the family Pasteuriaceae.
Bacillus firmus is an aerobic, Gram-positive, rod-shaped species of bacteria within the genus Bacillus. It is a soil-dwelling bacterium.
Mononchoides fortidens, of the order Diplogasterida, is a free-living predacious nematode that feeds on both nematodes and bacteria . The predatory behavior of this nematode presents the opportunity to use it as a bio-control agent against other plant parasitic nematodes. It has been shown to have a preference for the second stage juveniles of Meloidogyne incognita.
Prof. Waceke Wanjohi is a professor at Kenyatta University who works in plant pathology, research, teaching, networking, and graduate education. She is the l Vice Chancellor (Academic) at Kenyatta University. She was appointed to act as the Vice chancellor of the same university from July 2022. Dedicated to boosting Africa's competitiveness in the global arena by improving agricultural output in smallholder farming systems in Sub-Saharan Africa.
Benjamin Goodwin Chitwood was an American zoologist and pioneer in nematology. He published extensively and broadly in the field of nematology. An Introduction to Nematology, published with his wife May Belle Hutson Chitwood, was a major contribution to the field. Chitwood identified the species Globodera rostochiensis on Long Island in 1941 and as part of his work on higher classification revised the taxonomy of the root-knot nematode Meloidogyne incognita in 1949. This led to changes in research and control strategies for it. He served as president of the Helminthological Society of Washington in 1949 and was made a Life Member of the Society in 1968.
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