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Meloidogyne graminicola
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Rice (Oryza sativa L.) is one of the main cultivated crops worldwide and represents a staple food for more than half of the world population. Root-knot nematodes (RKNs), Meloidogyne spp., and particularly M. graminicola, are serious pests of rice, being, probably, the most economically important plant-parasitic nematode in this crop. M. graminicola is an obligate sedentary endoparasite adapted to flooded conditions. Until recently, M. graminicola was present mainly in irrigated rice fields in Asia, parts of the Americas, and South Africa. However, in July 2016, it was found in Europe, in northern Italy in the Piedmont region and in May 2018 in the Lombardy region in the province of Pavia.

damage hosts life cycle plant-parasitic nematode rice root-knot nematode
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Subjects: Pathology
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Entry Collection: Environmental Sciences
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Update Time: 16 Dec 2021

1. Introduction

Rice (Oryza sativa L.) is the third most important cereal crop in the world, just behind wheat and maize, playing a strategic role in solving food security issues. New risks to plant health are constantly emerging. Many nematodes in rice have been detected and described, but only a few have harmful effects on rice production, such is the case of the rice root-knot nematode (RKN) Meloidogyne graminicola Golden and Birchfield, 1965 (Mg) [1], recently detected in Italy and added to the European and Mediterranean Plant Protection Organization (EPPO) Alert List [2]Mg is considered a major threat to rice production, particularly in Asia. Projections by the Intergovernmental Panel for Climate Change indicate that there will be an increase in mean annual temperature and rainfall in South Asia, West Africa, and Europe. The elevated temperature and moisture may result in an increasing rate of infection, development, and reproduction, causing shifts in Mg abundance and geographic distribution. Such effects may have a detrimental impact on rice in temperate regions. Furthermore, Mg is a clear example of how alterations in rice production (shortage of water due to socioeconomic pressure and climate change) contributed to changes in its status as the major plant-parasitic nematode (PPN) in rice. An effort has been made to gather all the information regarding several aspects of Mg to present it as a comprehensive review on rice RKN.

2. Origin and Distribution

The rice RKN, Mg, was first isolated in India by Israel et al. [3], but it was only described in 1965 when it was found on the roots of barnyard grass (Echinochloa colonum) in Baton Rouge, Louisiana, USA [4]. Since then, this nematode has been reported from the USA on rice and weeds in Louisiana, on grass in Georgia and Mississippi, and on sandbur (Cenchrus spp.) in Florida [5][6][7][8]. Its occurrence has been widely accounted in rice fields in several Asian countries [9][10][11] and also in South Africa, Colombia, Brazil, and Italy [12][13][14].
Mg has been reported to parasitize primarily in irrigated and rainfed rice in South and Southeast Asian countries, such as China, India, the Philippines, Burma (Myanmar), Bangladesh, Pakistan, Laos, Thailand, Vietnam, and Nepal [15][16][17]. In China, it was first found on Allium tistulosum in the Hainan province by Zhao et al. [18]. More than a decade later, it was detected associated with rice and other hosts including weeds in the provinces of Anhui, Fujian, Hainan, Hunan, Hubei, Zhejiang, Jiangxi, and Sichuan, causing a severe incidence in the Hunan province [19][20][21][22].
In India, this nematode was first isolated in the county of Orissa from upland rice soils by Israel et al. [3]. Since then, it has been found infecting rice in the provinces of Andaman and Nicobar Islands, Assam, Andhra Pradesh, Bihar, Gujarat, Himachal Pradesh, Jammu and Kashmi, Karnataka, Kerala, Madhya Pradesh, Manipur, Orissa, Tamil Nadu, Tripura, and West Bengal [23][24]. In 1971, its presence was referred in Thailand, causing typical root galls in entire rice-growing areas and in nursery seedbeds [25], and in Bangladesh, where it has been often associated with deepwater and pre-monsoon upland rice systems [26][27][28]. Minor infestations were reported in lowland rainfed rice areas [28]. Nonetheless, in the northwest of Bangladesh, where the dominant cropping system is lowland rainfed alternated with wheat, severe infestations of Mg were observed [29].
Later, in the 1990s, Mg was reported infesting rice fields in Sri Lanka, where it is now dispersed into major rice-growing areas of the country [30][31][32]. In a study performed in Vietnam, in 1992, to determine the PPN in deepwater rice systems, Mg was identified for the first time as one of the main causes of high yield losses of rice [33]. In Pakistan, during a survey in rice fields of Sheikhupura (Punjab), Munir and Bridge [34] reported its presence for the first time in the country and in 2007, Mg was detected in Nepal [35].
The occurrence of Mg in Africa was recorded on grass roots of Paspalum sp. in the South East region of Antsirabe, and its identification was based on morphological traits [36]. Later, in 2014, during a survey carried out in 14 sites distributed along a NW/SE axis between the towns of Marovovay and Manakara, Mg was found [37].
The first report of Mg in South America was by Monteiro et al. [38] in cyperaceas collected in Presidente Prudente, São Paulo, Brazil. However, only in 1991, Sperandio and Monteiro [39] first reported and described the species in the municipality of Palmares do Sul (Rio Grande do Sul) and, in 1994, Sperandio and Amaral [40] found Mg in other municipalities in the south of Rio Grande do Sul. The latest reports confirm the presence of the rice RKN in the region [41][42].
In Ecuador, Mg was first identified in 1987, in the “Sausalito” village located in the corner of Puerto Inca, province of Guayas, in a field planted with the cultivar Oryzica 1. In surveys conducted in the Provinces of Manabí, Guayas, and Los Ríos, Mg was not found in any other field planted with rice. Nevertheless, by 2000, it had already been disseminated to all rice fields of the Province of Guayas and, in 2002, it was present in the Province of Los Ríos [43]. In a new survey conducted in 2015 in the provinces of Guayas and Los Ríos, the rice RKN was found to be the most widespread, occurring in both rainfed lowland and irrigated areas in high densities [13].
In Colombia, Goméz et al. [44] reported the presence of galls in the roots of rice plants in the county of Tolima, Ibague. Thirteen years later, in a survey programme established by the Colombian rice federation “FEDEARROZ”, Bastidas and Montealegre [45] described the symptoms of a new rice disease denominated as “Entorchamiento” and concluded that it was caused by nematodes of the Meloidogyne genus. The species Mg was later identified, on the basis of morphological and biometrical characters, in other counties and its presence confirmed in other rice production zones, corroborating its spread throughout the country [46][47].
In Europe, Mg was detected, in July 2016, in several rice fields of northern Italy in the Piedmont region, being the first report of its presence in the EPPO region [14]. Due to this detection, the EPPO decided to include Mg in the Alert List A2 in 2017. Following the first report, it was detected in the Lombardy region, province of Pavia [2].
This Meloidogyne species is present almost in every continent (Table 1Figure 1). Such occurrence and increase detection draws attention to its potential to affect temperate rice agro-systems adversely.
Figure 1. Geographical distribution of Meloidogyne graminicola.
Table 1. Distribution of Meloidogyne graminicola in Africa, America, Asia, and Europe.
Distribution Year References
Africa
Madagascar 2014 [37]
South Africa 1991 [36]
America (North-USA)
Florida 2003 [8]
Georgia 1984 [6]
Louisiana 1965 [4]
Mississippi 1990 [7]
America (South)
Brazil 1988, 1991, 1994, 2017, 2019 [38][39][40][41][42][48]
Colombia 1994, 2001, 2010 [45][46][47]
Ecuador 1987, 2002, 2016 [13][43]
Asia
Bangladesh 1971, 1978, 1979, 1983, 1990 [49][50][51][52]
China 2001, 2015, 2017, 2019, 2020, 2021 [18][19][20][21][22][53]
Indonesia 1993, 2015, 2018 [54][55][56]
India 1963, 1979, 1985, 1987, 1989, 1993, 1994, 2000,
2004, 2005, 2006, 2007, 2010, 2011, 2017
[3][23][57][58][59][60][61][62][63][64][65][66][67][68][69]
Laos 1968 [70][71]
Malaysia 1994 [72]
Myanmar 1981, 2011 [73][74]
Nepal 2007, 2009 [16][35]
Pakistan 2003 [34]
Philippines 1994, 2001 [75][76]
Singapore 2001 [77]
Sri-Lanka 1997, 2001 [30][31]
Thailand 1971 [25]
Vietnam 1992, 1994 [33][78]
Europe
Italy 2016, 2018 [2][14]

3. Damage/Crop Losses in Rice

Mg is the most prevalent PPN on rice and considered a major threat to rice as yield losses can reach up to 70% [12][79][80]Mg densities of 120, 250, and 600 eggs/plant in seedlings 10, 30, and 60 days after planting were reported by Rao et al. [81], causing 10% losses. In a later study, Cuc and Prot [65] stated that a density of 100 J2/g root could be considered as high infestation. Most recently, Win et al. [73] found that population densities could exceed 1000 J2/g root with 12–16 galls/plant, contributing to a 65% yield reduction. It has also been found that there is a decline in yield when more than 75% of the roots are affected by nematodes [32]. Additionally, the water regime is an important environmental factor that influences the development and population dynamics of Mg, and the damage and yield loss that it can cause to rice. Soriano et al. [82] showed that rice cultivar tolerance to Mg varies with the water regime and that yield losses may be prevented or minimized when the rice crop is flooded early and maintain inundated until harvesting. For example, losses in lowland rainfed rice in Bangladesh can range between 16 and 20%, while in India, losses range between 16 and 32% under irrigated conditions and between 11 and 73% under flooded conditions [83][84]. In China, the highest incidence of the disease is in the Hunan provinces, exceeding 85% in infested paddy fields [19]. Furthermore, reports of Mg infestations in rice–wheat agroecosystem of India, Nepal, and Pakistan suggest that the damage caused by the rice RKN may be responsible for the poor productivity in this cropping system [10][11][35][85].
Changes in agricultural policy and adoption of new rice production technologies in South East Asian countries have influenced the status of the rice RKN problem [64]. For instance, in the Philippines, Mg became a major constrain due to the intensification of rice cropping and shortage of water supply. This situation forced the farmers to grow direct wet seeding, and intermittent irrigation, providing favorable conditions for Mg infestation and increasing the economic losses [9][64]. In India, the system of rice cultivation shifted to the so-called “system of rice intensification practice”, where a new ecological condition is being developed through modification of rice cultivation practices that includes planting younger and tender seedlings, the creation of greater aeration in soil, and regulation in irrigation. All these conditions provide a suitable environment to increase the infestation levels of the rice RKN [80][85][86].
Spatio-temporal studies have also demonstrated that densities of Mg J2 in the soil fluctuate throughout the year [87]. Moreover, Mg’s ability to survive and reproduce in off-seasons on weeds and forage crops contributes to increase the population levels in the soil, and rice infection in the next season [35]. Besides alternative hosts and irrigation, the soil type influenced the tolerance of plants to Mg and showed differences in the multiplication of the nematode [82]. Studies have also revealed that infestation levels depend on the rice cultivar [88][89], and the aggressiveness differs between populations, suggesting intraspecific variability [35][90]. It was also found that Mg consists of more than one race. In fact, populations from Florida have shown less aggressiveness and difference on the host infection and reproduction patterns than the Asian populations, and populations from Vietnam are not able to reproduce on tomato (Solanum lycopersicum), soy (Glycyne max), or green beans (Phaseolus vulgaris), despite these species being reported as a host of Mg [16][90][91].

4. Host Plants

In addition to the main host, rice, Mg has a wide range of alternative hosts, including cereals and grasses, as well as dicotyledonous plants [15][91][92] (Table 2). Forty-six weeds commonly growing in or around rice fields were assessed for host suitability and were found to be moderate to good hosts of Mg [93]. Khan et al. [94] reported 17 weed species and, in 2009, Rich et al. [15] reported 24, which supported the survival and multiplication of Mg in the field, acting as a reservoir of nematodes when rice is not present during crop rotations [15] (Table 3). Furthermore, it was believed that Mg caused yield losses only in rice; however, a reduction of the root length of onion (Allium cepa) was observed, with yield losses of 16–35% in the Philippines [76]. In Nepal, India, Pakistan, and Bangladesh, it is considered a threat to wheat crops and to vegetables, such as aubergine (S. melongena), tomato, and okra (Abelmoschus esculentus) [10][93][95][96][97].
Table 2. Cultivated hosts of Meloidogyne graminicola.
Family Species (Common Name) Reference Family Species (Common Name) Reference
Amaranthaceae Beta vulgaris (Beetroot) [98] Musaceae Musa sp. (Banana) [99]
Spinacia oleracea (Spinach) [12]   M. acuminate (Dwarf banana) [100]
Amaryllidaceae Allium cepa (Onion) [76] Poaceae Avena sativa (Oat) [5]
  A. tuberosum (Chive) [101] Hordeum vulgare (Barley) [23]
A. fitsulosum (welsh onion) [101]
Apiaceae Coriandrum sativum (Coriander) [98] Oryza sativa (Rice) [5][6]
Asteraceae Lactuca sativa (Lettuce) [12] Saccharum officinarum (Sugarcane) [12]
Brassicaceae Brassica oleracea (Cabbage) [12] Sorghum bicolor (Sorghum) [12]
B. oleracea var. botrytis (Cauliflower) [100] Triticum aestivum (Wheat) [10][95]
Cucurbitaceae Cucumis sativus (Cucumber) [12]   Zea mays (Maize) [12]
Fabaceae Glycine max (Soybean) [93] Solanaceae Capsicum frutescens (Chilli) [102]
Phaseolus vulgaris (Common bean) [5] C. annuum (Pepper) [96]
Vigna adiate (Green gram) [12] Solanum lycopersicum (Tomato) [96]
V. unguiculata (Cowpea) [12] S. melongena (Aubergine) [96]
Malvaceae Abelmoschus esculentus (Okra) [96]      
Table 3. Weeds hosts of Meloidogyne graminicola.
Family Species (Common Name) Reference Family Species (Common Name) Reference
Alismataceae Alisma plantago (Common water- plantain) [14] Oxalidaceae Oxalis corniculata [100]
Amaranthaceae Alternanthera sessilis (Sessile joy weed) [94] Papillionaceae Melilotus alba (Yellow sweet clover) [23]
Amaranthus spinosus (Spiny amaranth) [40] Plantaginaceae Scoparia dulcis (Licorice weed) [93]
A. viridis (Slender amaranth) [93] Poaceae Agropyron repens (Quack grass) [94]
Acanthaceae Rungia parviflora [100] Andropogon sp. (Beard grass) [102]
Apiaceae Centella asiatica (Spade leaf) [100] Alopecurus sp. (Foxtails) [91]
Apocynaceae Catharanthus roseus (Periwinkle) [12] A. carolinianus (Carolina foxtail) [5]
Asteraceae Ageratum conyzoides (Billy-goat- weed) [94] Brachiaria mutica (Buffalo grass) [94]
Blumea sp. [102] B. ramosa (Brown top millet) [94]
Eclipta alba (False Daisy) [102] Bothriochloa intermedia [94]
E. prostrata (Eclipta alba) [103] Cynodon dactylon (Bermuda grass) [98]
Grangea ceruanoides [102] Cymbopogon citratus (Lemon grass) [100]
G. madraspatensis [102] Dactyloctenium aegyptiu [94]
Sphaeranthus sp. [98] D. annulatum [23]
Sphaeranthus senegalensis [100] Digitaria filiformis (Crab grass) [98]
Vernonia cinerea [100] D. longifolia (False couch grass) [104]
Balsaminaceae Impatiens balsamina (Garden balsam) [12] D. sanguinalis (Dewgrass) [94]
Brassicaceae Brassica juncea (Brown mustard) [12] Echinochloa colona [102]
Brassica sp. [12] E. colonum [4]
Caryophyllaceae Spergula arvensis (Corn spurry) [23] E. crus-galli (Barnyard grass) [5]
Stellaria media (Chickweed) [93] E. indica (Goose grass) [102]
Commelinaceae Cyanotis cucullata (Roth) [104] E. unioloides (Chinese love grass) [104]
Commelina benghalensis [104] Eleusine coracana (Finger millet) [98]
Murdannia keisak (Marsh dew flower) [14] Eragrostis tenella [100]
Compositae Gnaphalium coarctatum [105] Imperata cylindrica (Spikegrass) [100]
Cyperaceae Cyperus brevifolius (Kyllinga) [98] Ischaemum rugosum (Saramolla) [98]
C. compressus (Annual sedge) [106] Leersia hexandra [107]
C. difformis (Variable Flatsedge) [108] Oplismenus compositus [93]
C. imbricatus [98] Poa annua (Annual bluegrass) [40]
C. odoratus (Flats edge) [109] Panicum dichotomiflorum [40]
C. pilosus (Fuzzy flats edge) [100] P. miliaceum [93]
C. procerus [98] P. sumatrense [100]
C. pulcherrimus (Elegant s edge) [98] P. repens [40]
C. rotundus (Purple nutsedge) [94] Paspalum sanguinola [102]
Fimbristylis complanata [98] Paspalum scrobiculatum [98]
F. dichotoma [98] Pennisetum glaucum [100]
F. littoralis (Lesser fimbristylis) [98] P. pedicellatum [100]
F. miliacea [102] P. typhoides (Pearl millet) [93]
Fuirena ciliaris [98] Scirpus articulatus [98]
F. glomerata [98] Setaria italica (Foxtail millet) [12]
Schoenoplectus articulatus [100] Sporobolus diander [94]
Euphorbiaceae Chamaesyce hirta (Asthma herb) [136] Polemoniaceae Phlox drummondii (phlox) [12]
Phyllanthus urinaria [102] Pontederiaceae Heteranthera reniformis [14]
Fabaceae Desmodium triflorum [93] Monochoria vaginalis [12]
Pisum sativum (Garden pea) [12] Portulacaceae Portulaca oleracea [93]
Trifolium repens (White clover) [12] Solanaceae Petunia sp. [12]
Trigonella polyceratia [23] Physalis minima [94]
Hydrocharitaceae Hydrilla sp. [104] Sida acuta (Broom grass) [104]
Juncaceae Juncus microcephalus [137] Solanum nigrum [100]
Lamiaceae Leucas lavandulifolia [100] S. sisymbriifolium [100]
Linderniaceae Bonnaya brachiata [93][98] Sphenocleaceae Sphenoclea zeylanica [98]
Lindernia sp. [134] Ranunculaceae Ranunculus sp. (Buttercup) [106]
Vandellia sp. [102] Rubiaceae Borreira articularis [110]
Lythraceae Ammannia pentandra [98] Hedyotis diffusa [100]
Onagraceae Jussieua repens [102]      
Ludwigia adscendens (Primrose) [134]  

5. Management

The best strategy for management of Mg is to prevent the movement of plant and soil that in some cases may adhere to machinery or tools. In a recent pest risk analysis for Mg in Italy, it was concluded that the main ways of dispersion of this nematode are likely to be through the movement of infected plants and infested soil, non-host plants that may have grown near areas infested with Mg, and floating roots or plant material in the water [92]. Migrant waterbirds, machinery, and travelers were considered a secondary source of entrance. On the other hand, changes in the water regime (intermittent irrigation or water shortages) in many parts of the world are also contributing to the spread and infectivity of the nematode.
To minimize the losses resulting from Mg, management strategies are of extreme importance, and studies have shown that a combination of methods is the best approach to control this nematode in rice fields. The methods that have been applied to control Mg include the use of synthetic nematicides, known as the most efficient strategy, cultural methods, biological agents, and natural nematicides.
Some synthetic nematicides were, recently, strictly regulated or banned from the market, due to the adverse impacts on the environment and human health, reducing the alternatives for RKN control. Cultural methods (fallowing, soil solarization, crop diversification and rotation, etc.) also appeared to have some efficacy. For instance, crop rotation studies with non-host crops, like sweet potato (Ipomoea batatas), cowpea (Vigna unguiculata), sesame (Sesamum indicum), castor (Ricinus communis), sunflower (Helianthus annuus), soybean (Glycine max), turnip (Brassica rapa subsp. rapa), and cauliflower (Brassica oleracea var. botrytis), showed to prevent Mg development [81][104][111]. Nonetheless, none of these practices have gained importance among farmers, because of the high cost and unsatisfactory results. Furthermore, as many weeds found in rice fields are hosts for Mg, serving as nematode reservoirs for the next crops, a weed management programmme must be implemented to maintain a low nematode population in infested fields.
Alternative strategies, such as the “rice field flooding technique”, used by the Italian National Plant Protection Organization (Ministerial Decree of 6 July 2017) to control Mg, had some effect on the nematode population densities. Mg can still propagate under flooding conditions, but the damage induced by this nematode is lower than in shallow intermittently flooded fields [112][113]. Nevertheless, this method of control also has some limitations, as there are areas where this practice is not applicable due to the soil structure, characterized by a low water retention capacity, or restriction in water use. Another approach explored by Sacchi et al. [113] was the use of rice plants as trap crops. Preliminary results indicate that trap cropping for the management of the rice RKN is efficient in most rice-growing areas, especially those with water shortages. However, additional studies are required to establish the most effective number of trap crop cycles that are necessary to reduce Mg population density. Additionally, this technique, in our opinion, could be highly influenced by climate in northern latitudes in order to sow rice in advance and the cost of machinery and water.
The use of biological control agents, such as the fungi Paecilomyces lilacinusTrichoderma harzianum, T. viride, and other Trichoderma spp.; the bacteria Bacillus subtilis; and the rhizobacterium Pseudomonas fluorescence, have shown promising results against Mg [114][115][116][117]. Studies by Amarasinghe and Hemachandra [117], in Sri Lanka, revealed that T. viride reduces gall formation and production of egg masses, which represents a potential strategy to be included in integrated pest management programs.
Similarly, the use of essential oils (EOs) has been explored to control RKN, as an alternative to the synthetic nematicides. The nematicidal effects of EO from spices and medicinal plants on RKN have been widely reported. The high effect of Cymbopogon spp. EO (C. martini motiaC. flexuosusand, and C. winterianus) on J2 mortality has been described [118][119][120]. Chavan et al. [121] stated that basil (Ocimum basilicum), peppermint (Mentha×piperita), and lemongrass (Cymbopogon citratus) EOs have nematicidal properties against Mg. In order to confirm the efficacy of these EOs, the in vitro tests must be complemented by in vivo soil-based experiments.
Host plant resistance is an environmentally friendly and cost-effective strategy to mitigate damage caused by Mg. A promising alternative for the control of Mg is the screening of germplasm for genotypes that are resistant/tolerant and the development of resistant/tolerant cultivars [112][122][123]. Resistance sources against Mg have been identified in African wild accessions of rice (O. glaberrima and O. longistaminata and O. rufipogon) [124], and variability to a certain extent has been perceived [125]. Wild accessions that are partially or fully resistant to Mg can therefore act as resistant donors for interspecific crosses with Asian cultivars of rice [124][126]. Introgression of O. glaberrima into O. sativa has led, for example, to the new rice for Africa, NERICA cultivars [127], but the introgression has not been very successful [128]. Therefore, natural resistance in O. sativa cultivars is potentially very important. In Asian rice, using the Bala and Azucena mapping population, chromosomes 1, 2, 6, 7, 9, and 11 have been reported as having quantitative trait loci (QTL) for partial resistance to Mg [129]. Mapping of Mg resistance on chromosome 10 in Asian rice (cv. Abhishek), using bulk segregant analysis, was reported by Mhatre et al. [130]. A hypersensitivity-like reaction to Mg infection found in the Asian rice cv. Zhonghua 11 suggests that resistance to Mg was qualitative rather than quantitative, involving (a) major gene(s) [131]. Galeng-Lawilao et al. [132] reported the main effect QTL for field resistance in Asian rice on chromosomes 4, 7, and 9 plus two epistatic interactions (between loci on chromosome 3 and 11, and between 4 and 8).
Few studies have used genome-wide association studies (GWASs) as a viable strategy to identify novel QTLs for PPN resistance or susceptibility in different plants [133][134]. For example, Dimkpa et al. [133] confirmed the robustness of GWAS to screen for rice–nematode interactions and identified two resistant accessions (Khao Pahk Maw and LD 24). Studies carried out, in India, by Hada et al. [135] allowed the identification of 40 highly resistant accessions. Alternatively, the profiling of the defense response of 36 rice cultivars to Mg infection revealed a variation in the expression of plant defense genes [136]. Among all the selected plant defense genes, the expression of mitogen-activated protein kinases (MAPK20), isochorismate synthase genes (ICS1), nonexpressor of pathogenicity expression genes1 (NPR1), phytoalexin-deficient 4 (PAD4), allene oxidase synthase (AOS2), jasmonic acid-inducible rice myb gene (JAMYB), and 1-aminocyclopropane-1-carboxylic acid oxidase (ACO7) was upregulated, possibly providing resistance against Mg. This observation matches the insignificant expression in the susceptible genotypes. These outcomes are significant and can be exploited for breeding purposes.

References

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Subjects: Pathology
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View Times: 175
Entry Collection: Environmental Sciences
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Update Time: 16 Dec 2021
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    Maleita, C.; Rusinque, L. Meloidogyne graminicola. Encyclopedia. Available online: https://encyclopedia.pub/entry/17175 (accessed on 03 October 2022).
    Maleita C, Rusinque L. Meloidogyne graminicola. Encyclopedia. Available at: https://encyclopedia.pub/entry/17175. Accessed October 03, 2022.
    Maleita, Carla, Leidy Rusinque. "Meloidogyne graminicola," Encyclopedia, https://encyclopedia.pub/entry/17175 (accessed October 03, 2022).
    Maleita, C., & Rusinque, L. (2021, December 15). Meloidogyne graminicola. In Encyclopedia. https://encyclopedia.pub/entry/17175
    Maleita, Carla and Leidy Rusinque. ''Meloidogyne graminicola.'' Encyclopedia. Web. 15 December, 2021.
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