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Journal articles on the topic "Pratylenchus Filipjev"
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B, Avhad Sunil, and Hiware Chandrashekhar J. "Studies on Population Dynamics of Pratylenchus sp. (Filipjev, 1936) about Soil Abiotic Factor in the Mulberry Field at Aurangabad, Maharashtra, India." Shanlax International Journal of Arts, Science and Humanities 8, S1-Feb (February 6, 2021): 67–72. http://dx.doi.org/10.34293/sijash.v8is1-feb.3933.
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In the present study, the monthly population fluctuation of Pratylenchus sp. (Filipjev, 1936) is ascertain about soil temperature, moisture, pH in mulberry (Morus alba L.) field with economic importance within the sericulture. The studies target is to grasp the influence and impact of those soil abiotic factors on the population of those plant-parasitic nematodes and Correlation coefficients (r) between mean population Pratylenchus spand different soil abiotic factors in Aurangabad Mulberry garden.
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Timper, P., and B. B. Brodie. "First Report of Pratylenchus neglectus in New York." Plant Disease 81, no. 2 (February 1997): 228. http://dx.doi.org/10.1094/pdis.1997.81.2.228c.
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Soil samples were collected from a field in Wyoming County near Portageville, NY, on 29 October 1992 and 23 November 1993. The field was planted with winter wheat (Triticum aestivum L.) from September 1991 to August 1992, and with potato (Solanum tuberosum L.) cv. Superior from May 1993 to September 1993. Thirty-nine and 45 samples were collected along three transects in 1992 and 1993, respectively. Two species of Pratylenchus were identified, P. neglectus (Rensch) Filipjev & Sch. Stek. (identification confirmed by A. M. Golden) and P. penetrans (Cobb) Filipjev & Sch. Stek. Their combined population densities were 134 ± 18 (mean ± SE per 100 cm3 soil) in 1992 and 195 ± 12 in 1993. P. neglectus was found in all samples, whereas P. penetrans was found in 33 and 78% of the samples in 1992 and 1993, respectively. Where both species occurred together, the density of P. neglectus was 7 to 8 times that of P. penetrans. In both years, spores of a nematode-pathogenic bacterium (probably a Pasteuria sp.) were found attached to the cuticle of P. penetrans (68% with spores in 1993) but were rarely attached to P. neglectus (less than 1% with spores). Although both Pratylenchus spp. are widespread in North America, this is the first report of P. neglectus in New York. Its dominance in the field was unexpected because P. penetrans and P. crenatus Loof are typically the dominant Pratylenchus spp. in potato production regions of northeastern North America (1). The presence of the bacterium, which appeared to be host-specific for P. penetrans, may help explain the dominance of P. neglectus. Reference: (1) R. N. Huettel et al. Am. Potato J. 68:345, 1991.
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Handoo, Zafar A., Guiping Yan, Mihail R. Kantor, Danqiong Huang, Intiaz A. Chowdhury, Addison Plaisance, Gary R. Bauchan, and Joseph D. Mowery. "Morphological and Molecular Characterization of Pratylenchus dakotaensis n. sp. (Nematoda: Pratylenchidae), a New Root-Lesion Nematode Species on Soybean in North Dakota, USA." Plants 10, no. 1 (January 17, 2021): 168. http://dx.doi.org/10.3390/plants10010168.
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Root-lesion nematodes (Pratylenchus spp.) of the genus Pratylenchus Filipjev, 1936, are among the most important nematode pests on soybean (Glycine max (L.) Merr.), along with soybean cyst and root-knot nematodes. In May 2015 and 2016, a total of six soil samples were collected from a soybean field in Walcott, Richland County, ND and submitted to the Mycology and Nematology Genetic Diversity and Biology Laboratory (MNGDBL), USDA, ARS, MD for analysis. Later, in 2019, additional nematodes recovered from a greenhouse culture on soybean originally from the same field were submitted for further analysis. Males, females, and juveniles of Pratylenchus sp. were recovered from soil and root samples and were examined morphologically and molecularly. DNA from single nematodes were extracted, and the nucleotides feature of three genomic regions targeting on the D2–D3 region of 28S rDNA and ITS rDNA and mitochondrial cytochrome oxidase subunit I (COX1) gene were characterized. Phylogeny trees were constructed to ascertain the relationships with other Pratylenchus spp., and polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was performed to provide a rapid and reliable differentiation from other common Pratylenchus spp. Molecular features indicated that it is a new, unnamed Pratylenchus sp. that is different from morphologically closely related Pratylenchus spp., including P. convallariae, P. pratensis, P. fallax, and P. flakkensis. In conclusion, both morphological and molecular observations indicate that the North Dakota isolate on soybean represents a new root-lesion nematode species which is named and described herein as Pratylenchus dakotaensis n. sp.
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Christie, B. R., and J. L. Townshend. "Selection for resistance to the root-lesion nematode in alfalfa." Canadian Journal of Plant Science 72, no. 2 (April 1, 1992): 593–98. http://dx.doi.org/10.4141/cjps92-074.
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A study was conducted to evaluate response of alfalfa (Medicago sativa L.) to selection for resistance to the root-lesion nematode (Pratylenchus penetrans (Cobb) Filipjev and Sch.-Stek.) under growth-room facilities. Six hundred plants of the cultivar Vernal were inoculated with root-lesion nematodes. Counts were made 13–14 wk later of the number of nematodes g−1 root. Selections were made for relatively low counts (resistant) and high counts (susceptible). Selections were self-pollinated, and the S1 progeny of nine plants (five resistant and four susceptible) were evaluated. The S1 progenies from both types of selections had similar counts. The S2 progenies of resistant S1 parents, however, had lower counts than those of susceptible parents. The F1 crosses generally reacted as expected on the basis of the S2 parents. Results of this study suggest that progress can be made in breeding for resistance to the root-lesion nematode in alfalfa.Key words: Nematode, Pratylenchus penetrans, alfalfa, selection
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Sigariova, D. D., and V. G. Karpliyk. "Parasitic Nematodes in Flowering and Ornamental Plants: Effect of Parasites on the Plants and Response of the Plants to the Presence of Nematodes." Vestnik Zoologii 49, no. 5 (October 1, 2015): 427–32. http://dx.doi.org/10.1515/vzoo-2015-0049.
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We studied the composition of the parasitic nematodes in the flowering and ornamental plants cultivated at the greenhouse facilities in the city of Kyiv. We found 9 species from the genera Meloidogyne Goeldi, 1887, Ditylenchus Filipjev, 1936, Pratylenchus Filipjev, 1934, Rotylenchus Filipjev, 1936, Tylenchorhynchus Cobb, 1913, Helicotylenchus Steiner, 1945, Paratylenchus Micoletzky, 1922, and Heterodera Schmidt, 1871. We also discovered the nature of the external manifestations of the nematodes’ effect on the plants and the plants’ response to the infection. Special attention was paid to the loss of the ornamental properties. In order to rank the loss of the ornamental properties of the plants under nematode infection, the scale (ranking system) was suggested. It includes 5 grades applicable to the exterior appearance of the plants, where “5” stands for “excellent”; “4” stands for “good” “3” stands for “satisfactory”; “2” stands for “unsatisfactory”; and “1” stands for “bad”. Th e joint parasitic activity of two nematode species (D. dipsaciі and R. robustus in asparagus, and D. dipsaciі and M. incognita in begonia) caused the highest level of infection progress observed (4 points), and this resulted in worsening of the exterior appearance of plants and in decrease of their ornamentality/ornamental properties down to “bad” (1 point). Th e parasitic activity of P. penetrans in coleus coincided with a high degree of the infection progress (3 to 3.5 points) while the ornamental properties of the plants corresponded to the gradations identified as “unsatisfactory” (2 points) and “bad” (1 point).
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Pinkerton, Jack, and Chad E. Finn. "Responses of Strawberry Species and Cultivars to the Root-lesion and Northern Root-knot Nematodes." HortScience 40, no. 1 (February 2005): 33–38. http://dx.doi.org/10.21273/hortsci.40.1.33.
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The relative susceptibility of 44 genotypes of wild Fragaria L. and commercial cultivars of strawberry Fragaria ×ananassa Duch. to Meloidogyne hapla Chitwood and Pratylenchus penetrans (Cobb) Filipjev & Shuurmans Stekhoven was evaluated in the greenhouse. Eleven genotypes were highly resistant to populations of M. hapla from Washington State and Oregon, with Rf values (initial nematode density/final population density) less than 0.5. However, root growth of most genotypes, including resistant genotypes, was reduced by M. hapla. Thirteen genotypes were ranked more resistant to P. penetrans than F. ×ananassa `Totem', a susceptible cultivar. Root growth of most genotypes was not affected by P. penetrans under these experimental conditions. We conclude that commercial cultivars and wild Fragaria genotypes can provide a readily exploitable source of resistance to M. hapla. Conversely, sources of resistance to P. penetrans were uncommon in the germplasm evaluated. The F. ×ananassa cultivars, which already have commercially important characteristics, appear to be a better source of resistance for both nematode species than the wild, unimproved germplasm.
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Costante, Joseph F., Wesley R. Autio, and Lorraine P. Berkett. "INFLUENCE OF SOIL FUMIGANTS AND A NEMATICIDE ON GROWTH AND YIELD OF `MCINTOSH' APPLE TREES ON VARIOUS ROOTSTOCKS." HortScience 26, no. 5 (May 1991): 479f—479. http://dx.doi.org/10.21273/hortsci.26.5.479f.
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`Rogers Red McIntosh' apple (Malus domestica Borkh.) trees on MM. 111, MM. 106, M.7a, or M.26 were planted in 1984 on an old orchard site, diagnosed with an apple replant disease (ARD) problem. Soil treatments included Telone c-17, Vorlex, Nemacur 3, or not treated. After six years, tree performance problems usually associated with severe ARD did not develop. Lesion nematode [Pratylenchus penetrans (Cobb) Filipjev and Schuurmans-Stekhoven] populations feeding within or on the surface of roots were not affected by nematicide treatments nor rootstocks, even though slightly damaging levels were found in 1986. At the end of the sixth growing season, trunk cross-sectional areas were similar for trees in treated and in untreated soils. Trees on MM. 111 and MM. 106 were the largest, and those on M.26 were the smallest. Cumulative yield was not influenced by soil treatments, but trees on MM. 111 produced the greatest cumulative yields, whereas trees on M.26 were the most yield efficient.
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Particka, Chrislyn Ann, and James F. Hancock. "Breeding for Increased Tolerance to Black Root Rot in Strawberry." HortScience 43, no. 6 (October 2008): 1698–702. http://dx.doi.org/10.21273/hortsci.43.6.1698.
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Black root rot (BRR) is a widespread disease of strawberry (Fragaria ×ananassa) that causes the death of feeder roots and the degradation of structural roots resulting in an overall decrease in productivity. Black root rot is primarily caused by Rhizoctonia fragariae Husain and W.E. McKeen, Pythium Pringsh., and Pratylenchus penetrans (Cobb) Filipjev and Schuurmans Stekhoven. A previous study identified varying levels of tolerance to BRR in strawberry cultivars with some having high levels of tolerance. In this study, progeny populations were created to determine the amount of genetic variability for BRR tolerance. Genotypes with high, intermediate, and low tolerance to BRR were crossed in a diallel mating scheme, progeny were planted in Vapam (metam sodium)-fumigated and nonfumigated soil, and were analyzed for yield parameters. The results showed significant differences for both treatment and family, but not for the interaction between treatment and family. Pathogen analysis indicated presence of fungal pathogens and nematodes in both fumigated and nonfumigated soil.
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Vrain, Thierry, Robyn DeYoung, John Hall, and Stan Freyman. "Cover Crops Resistant to Root-lesion Nematodes in Raspberry." HortScience 31, no. 7 (December 1996): 1195–98. http://dx.doi.org/10.21273/hortsci.31.7.1195.
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Cover crops used in red raspberry plantings (Rubus idaeus L.) are often good hosts of the root-lesion nematode (Pratylenchus penetrans Filipjev & Sch. Stekoven), a major soilborne pathogen of raspberry. The effects of two susceptible cover crops, white clover (Trifolium repens L.) and barley (Hordeum vulgare L.), planted in between rows, on nematode density and growth of raspberry plants were compared to those of three cover crops resistant to the nematode: redtop (Agrostis alba L.), creeping red fescue (Festuca rubra L.), and `Saia' oat (Avena sativa L.). Nematode multiplication in raspberry roots and in cover crop roots was assessed over 4 years. Growth and vigor of plants were estimated at the end of the experiment by counting primocanes and determining height and biomass. Nematode multiplication was suppressed in roots of `Saia' oat, fescue, and redtop compared to barley or white clover. Nematode density in roots and rhizosphere soil of raspberry was not affected by the choice of cover crops. Nematode suppression in the three resistant cover crops did not translate into increased vigor of raspberry plants.
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Particka, Chrislyn A., and James F. Hancock. "Field Evaluation of Strawberry Genotypes for Tolerance to Black Root Rot on Fumigated and Nonfumigated Soil." Journal of the American Society for Horticultural Science 130, no. 5 (September 2005): 688–93. http://dx.doi.org/10.21273/jashs.130.5.688.
Full textAbstract:
Black root rot (BRR) is a widespread disease of strawberry (Fragari×ananassa Duchnesne) that causes the death of feeder roots and the degradation of structural roots. The major causal organisms of BRR include Rhizoctonia fragariae Husain and W.E. McKeen, Pythium Pringsh., and Pratylenchus penetrans (Cobb) Filipjev and Schuurmans Stekhoven. The current method of control for black root rot is methyl-bromide fumigation; however, methyl bromide is scheduled to be phased out in 2005, and its effects are short-lived in matted-row systems. The objectives of the study were to measure levels of tolerance to BRR in 20 strawberry genotypes and to determine which pathogens were present in the soil. The genotypes were planted in four blocks each of methyl-bromide fumigated and nonfumigated soil, and were evaluated for crown number, number of flowers per crown, yield, and average berry weight over 2 years. The results showed that all three pathogens were present in the field, and that there was a significant genotype × fumigation interaction for yield and crown number in both years. The cultivars Bounty, Cabot, and Cavendish, all released from the breeding program in Nova Scotia, displayed tolerance to the pathogens that cause BRR.
Dissertations / Theses on the topic "Pratylenchus Filipjev"
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Gonzaga, Vilmar [UNESP]. "Caracterização morfológica, morfométrica e multiplicação in vitro das seis espécies mais comuns de Pratylenchus Filipjev, 1936 que ocorrem no Brasil." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/105288.
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gonzaga_v_dr_jabo.pdf: 2262058 bytes, checksum: 9f1c54256f73cca2fe58faf334cc3382 (MD5)Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Os nematóides das lesões radiculares (Pratylenchus spp.) são considerados o segundo grupo de fitonematóides de maior importância econômica em todo o mundo. A morfologia e a morfometria das seis espécies mais comuns desses nematóides, no Brasil, a saber: Pratylenchus brachyurus, P. coffeae, P. jaehni, P. penetrans, P. vulnus e P. zeae, foram estudas aos microscópios óptico composto e eletrônico de varredura. Os dados foram analisados, também, por análise discriminante e análise canônica, tendo sido determinada uma equação da função de classificação para cada uma das espécies. Conquanto cada uma das espécies possa ser identificada por qualquer das ferramentas utilizadas, a análise morfológica, a análise morfométrica, assim como as análises discriminante e canônica devem ser consideradas ferramentas complementares no processo de identificação das espécies, aumentando a confiabilidade da identificação. Uma grade politômica ilustrada para identificação rápida dessas espécies foi elaborada. A técnica de multiplicação in vitro dessas espécies em cilindro de cenoura mostrou-se adequada para produção massiva desses nematóides, sendo que P. penetrans e P. jaehni foram as espécies que produziram, respectivamente, o maior e o menor número de indivíduos e ovos por cilindro de cenoura, aos 120 dias após a inoculação.
The lesion nematodes (Pratylenchus spp.) are considered the second largest group of plant parasitic nematodes of economic importance in the world. The morphology and morphometry of the six more common species of these nematodes in Brazil, namely: Pratylenchus brachyurus, P. coffeae, P. jaehni, P. penetrans, P. vulnus and P. zeae, were studied at the light and scanning electron microscopes. The data were also submitted to discriminant and canonical analyses and an equation of the classification function for each one of the species was determinated. Althought each one of the species can be identified by any of the tools used, the morphologic and morphometric analyses, as well as the discriminant and canonical analyses, must be considered complementary tools in the process of species identification, thus increasing the reliability of the identification. An illustrated polytomous key for a fast identification of these species was elaborated. The in vitro multiplication technique of these species in carrot cylinder was suitable for massive production of these nematodes. Pratylenchus penetrans and P. jaehni were the species that produced, respectively, the greatest and the smallest number of individuals and eggs for carrot cylinder, 120 days after the inoculation.
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Gonzaga, Vilmar. "Caracterização morfológica, morfométrica e multiplicação in vitro das seis espécies mais comuns de Pratylenchus Filipjev, 1936 que ocorrem no Brasil /." Jaboticabal : [s.n.], 2006. http://hdl.handle.net/11449/105288.
Full textAbstract:
Orientador: Jaime Maia dos SantosBanca: Marineide Mendonça Aguillera
Banca: Maria Amélia dos Santos
Banca: Arlindo Leal
Banca: Modesto Barreto
Resumo: Os nematóides das lesões radiculares (Pratylenchus spp.) são considerados o segundo grupo de fitonematóides de maior importância econômica em todo o mundo. A morfologia e a morfometria das seis espécies mais comuns desses nematóides, no Brasil, a saber: Pratylenchus brachyurus, P. coffeae, P. jaehni, P. penetrans, P. vulnus e P. zeae, foram estudas aos microscópios óptico composto e eletrônico de varredura. Os dados foram analisados, também, por análise discriminante e análise canônica, tendo sido determinada uma equação da função de classificação para cada uma das espécies. Conquanto cada uma das espécies possa ser identificada por qualquer das ferramentas utilizadas, a análise morfológica, a análise morfométrica, assim como as análises discriminante e canônica devem ser consideradas ferramentas complementares no processo de identificação das espécies, aumentando a confiabilidade da identificação. Uma grade politômica ilustrada para identificação rápida dessas espécies foi elaborada. A técnica de multiplicação in vitro dessas espécies em cilindro de cenoura mostrou-se adequada para produção massiva desses nematóides, sendo que P. penetrans e P. jaehni foram as espécies que produziram, respectivamente, o maior e o menor número de indivíduos e ovos por cilindro de cenoura, aos 120 dias após a inoculação.
Abstract: The lesion nematodes (Pratylenchus spp.) are considered the second largest group of plant parasitic nematodes of economic importance in the world. The morphology and morphometry of the six more common species of these nematodes in Brazil, namely: Pratylenchus brachyurus, P. coffeae, P. jaehni, P. penetrans, P. vulnus and P. zeae, were studied at the light and scanning electron microscopes. The data were also submitted to discriminant and canonical analyses and an equation of the classification function for each one of the species was determinated. Althought each one of the species can be identified by any of the tools used, the morphologic and morphometric analyses, as well as the discriminant and canonical analyses, must be considered complementary tools in the process of species identification, thus increasing the reliability of the identification. An illustrated polytomous key for a fast identification of these species was elaborated. The in vitro multiplication technique of these species in carrot cylinder was suitable for massive production of these nematodes. Pratylenchus penetrans and P. jaehni were the species that produced, respectively, the greatest and the smallest number of individuals and eggs for carrot cylinder, 120 days after the inoculation.
Doutor
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Barbosa, Bruno Flávio Figueiredo [UNESP]. "Estudo das inter-relações patógeno-hospedeiro de Meloidogyne incognita (Kofoid & White) Chitwood, M. Javanica (Treub) Chitwood e Pratylenchus brachyurus (Godfrey) Filipjev & Schuurmans Stekhoven em cana-de-açúcar." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/91370.
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barbosa_bff_me_jabo.pdf: 705710 bytes, checksum: b580c7d1b1347b4684db02e1630e42ee (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
No Brasil, Pratylenchus zeae, Meloidogyne javanica e M. incognita são as espécies-chave para a cana-de-açúcar. Em dois experimentos conduzidos em casa de vegetação, em Jaboticabal, um com duração de 12 meses e outro de 75 dias, foram estudadas as inter-relações de M. incognita, M. javanica e P. brachyurus, envolvendo 10 variedades de cana-de-açúcar. A resistência das variedades variou expressivamente em relação aos nematóides estudados. Conquanto a taxa de multiplicação de M. javanica, na variedade SP911049, tenha sido muito menor que a de M. incognita, os dados sugerem que M. javanica é mais agressiva. O parasitismo de Meloidogyne javanica e M. incognita a ‘SP911049’ predispõe essa variedade ao ataque da cochonilha Saccharicoccus sacchari. As variáveis biométricas utilizadas no presente estudo, a massa de matéria fresca de parte aérea e raízes confirmam maior agressividade de M. javanica à variedade SP911049, em relação a M. incognita. Entre as variedades testadas, a SP891115 é a única resistente à M. incognita e nenhuma delas é resistente a M. javanica. Entre essas, a RB855453 é a menos suscetível a M. javanica, e a SP801816 é a mais suscetível às três espécies de nematóides incluídas no estudo. As variedades CTC2, SP832847, RB855156, SP803280, CTC9, SP911049, SP891115 e RB855453 são resistentes a P. brachyurus, e somente a SP801816, entre as nove variedades testadas, é suscetível, sendo que o nematóide influenciou negativamente nos valores de todas as variáveis consideradas nas avaliações.
In Brazil, Pratylenchus zeae, Meloidogyne javanica and M. Incognita are the key species for sugar cane. In two experiments carried out in pots in a greenhouse in Jaboticabal city, one with duration of 12 months another for 75 days, the relationships of M. incognita, M. javanica and P. brachyurus, involving 10 varieties of sugar cane were studied. The resistance of the varieties varied significantly in relation to the nematodes. While the rate of increase of M. javanica in SP911049 variety has been lower than that of M. incognita, the data suggest that M. javanica is more aggressive. The parasitism of M. javanica and M. incognita to ‘SP911049’ predisposes that variety to attack of Saccharicoccus sacchari. The biometric variables used in this study, the mass of fresh matter of the above ground part and the mass of fresh matter of roots confirm the greater aggressiveness of M. javanica to the variety SP911049, than M. incognita. Among the varieties tested, SP891115 is the only resistant to M. incognita and none of them are resistant to M. javanica. Among these, RB855453 is the least susceptible to M. javanica and SP801816 is the most susceptible to the three species of nematodes included in the study. The varieties CTC2, SP832847, RB855156, SP803280, CTC9, SP911049, SP891115 and RB855453 are resistant to P. brachyurus and only the variety SP801816, among the nine varieties tested is susceptible. Also, the nematode adversely affected the values of all variables considered in the evaluations.
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Barbosa, Bruno Flávio Figueiredo. "Estudo das inter-relações patógeno-hospedeiro de Meloidogyne incognita (Kofoid & White) Chitwood, M. Javanica (Treub) Chitwood e Pratylenchus brachyurus (Godfrey) Filipjev & Schuurmans Stekhoven em cana-de-açúcar /." Jaboticabal : [s.n.], 2008. http://hdl.handle.net/11449/91370.
Full textAbstract:
Orientador: Jaime Maia dos SantosBanca: Marineide Mendonça Aguillera
Banca: Júlio Cesar Galli
Resumo: No Brasil, Pratylenchus zeae, Meloidogyne javanica e M. incognita são as espécies-chave para a cana-de-açúcar. Em dois experimentos conduzidos em casa de vegetação, em Jaboticabal, um com duração de 12 meses e outro de 75 dias, foram estudadas as inter-relações de M. incognita, M. javanica e P. brachyurus, envolvendo 10 variedades de cana-de-açúcar. A resistência das variedades variou expressivamente em relação aos nematóides estudados. Conquanto a taxa de multiplicação de M. javanica, na variedade SP911049, tenha sido muito menor que a de M. incognita, os dados sugerem que M. javanica é mais agressiva. O parasitismo de Meloidogyne javanica e M. incognita a 'SP911049' predispõe essa variedade ao ataque da cochonilha Saccharicoccus sacchari. As variáveis biométricas utilizadas no presente estudo, a massa de matéria fresca de parte aérea e raízes confirmam maior agressividade de M. javanica à variedade SP911049, em relação a M. incognita. Entre as variedades testadas, a SP891115 é a única resistente à M. incognita e nenhuma delas é resistente a M. javanica. Entre essas, a RB855453 é a menos suscetível a M. javanica, e a SP801816 é a mais suscetível às três espécies de nematóides incluídas no estudo. As variedades CTC2, SP832847, RB855156, SP803280, CTC9, SP911049, SP891115 e RB855453 são resistentes a P. brachyurus, e somente a SP801816, entre as nove variedades testadas, é suscetível, sendo que o nematóide influenciou negativamente nos valores de todas as variáveis consideradas nas avaliações.
Abstract: In Brazil, Pratylenchus zeae, Meloidogyne javanica and M. Incognita are the key species for sugar cane. In two experiments carried out in pots in a greenhouse in Jaboticabal city, one with duration of 12 months another for 75 days, the relationships of M. incognita, M. javanica and P. brachyurus, involving 10 varieties of sugar cane were studied. The resistance of the varieties varied significantly in relation to the nematodes. While the rate of increase of M. javanica in SP911049 variety has been lower than that of M. incognita, the data suggest that M. javanica is more aggressive. The parasitism of M. javanica and M. incognita to 'SP911049' predisposes that variety to attack of Saccharicoccus sacchari. The biometric variables used in this study, the mass of fresh matter of the above ground part and the mass of fresh matter of roots confirm the greater aggressiveness of M. javanica to the variety SP911049, than M. incognita. Among the varieties tested, SP891115 is the only resistant to M. incognita and none of them are resistant to M. javanica. Among these, RB855453 is the least susceptible to M. javanica and SP801816 is the most susceptible to the three species of nematodes included in the study. The varieties CTC2, SP832847, RB855156, SP803280, CTC9, SP911049, SP891115 and RB855453 are resistant to P. brachyurus and only the variety SP801816, among the nine varieties tested is susceptible. Also, the nematode adversely affected the values of all variables considered in the evaluations.
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