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ASPECTOS GENERALES DE LA INTERACCIóN TOMATE (Solanum lycopersicon L.) _ Meloidogyne incognita
Arias,Yailén; González,Ivonne; Rodríguez,Mayra; Rosales,Carolina; Suárez,Zoraida; Peteira,Belkis;
Revista de Protecci?3n Vegetal , 2009,
Abstract: in this paper, general aspects of the interaction tomato-meloidogyne incognita are summarized. the morphological and physiological specifications of nematodes as organisms causing diseases, the mechanisms developed by this group during penetration and infectation and the plant defense mechanisms are analized.
EFECTO DEL VERMICOMPOST Y QUITINA SOBRE EL CONTROL DE Meloidogyne incognita EN TOMATE A NIVEL DE INVERNADERO  [cached]
Leida Castro,Lorena Flores,Lidieth Uribe
Agronomía Costarricense , 2011,
Abstract: Meloidogyne incognita es un nematodo endoparásito sedentario, de penetración total y formador de nódulos radicales; tiene una amplia distribución geográfica y causa pérdidas agrícolas importantes. Recientemente se han utilizado abonos orgánicos y compuestos como la quitina en la supresión de plagas y enfermedades de plantas. El objetivo de esta investigación fue evaluar el efecto de la aplicación de vermicompost de estiércol bovino y su enriquecimiento con quitina, sobre la infección de M. incognita en plantas de tomate var. Hayslip bajo condiciones de invernadero. Para esto se inocularon las plantas con 5000 unidades de inóculo (huevos+juveniles en segundo estado) por maceta y se compararon con controles que fueron sembrados en suelo sin enmienda orgánica o quitina. La evaluación se llevó a cabo 60 días después y se midió el peso fresco aéreo y radical, peso seco aéreo, población total de nematodos en raíz y suelo, índice de nódulos radicales (INR), índice de masas de huevos (IMH), el factor de reproducción del nematodo (FR) y recuento de grupos funcionales (hongos, bacterias y actinomicetes). La adición al suelo de vermicompost provocó un incremento en las variables peso fresco y seco foliar y peso fresco radical: a mayor porcentaje de vermicompost, mayor incremento; así mismo, la aplicación del vermicompost redujo la cantidad del nematodo en raíz y en suelo. La aplicación de quitina acentuó estos resultados, obteniéndose el menor factor de reproducción de M. Incognita, con un valor de 3,76 para la dosis de 50% vermicompost+quitina, mientras que en el testigo este factor fue de 93,20. La aplicación de quitina como enmienda única solo afectó la población de hongos en el suelo, mientras que la de actinomicetes aumentó en los tratamientos enmendados.
COMPORTAMIENTO DE GENOTIPOS DE TOMATE (Solanum lycopersicum L.) FRENTE A Meloidogyne incognita (Kofoid y White) CHITWOOD1
Navarro-Barthelemy,L; Gómez,Lucila; Enrique,R; González,Farah M; Rodríguez,Mayra G;
Revista de Protecci?3n Vegetal , 2009,
Abstract: root-knot nematodes meloidogyne spp., represent one of the factors that limit vegetable production under sheltered conditions. the hybrids and varieties of tomato produced under this technology are imported and their responses to meloidogyne incognita kofoi y white (chitwood) under these conditions are unknown. the main objective of this work was to evaluate the resistant/susceptibility of tomato hybrids fa 572- katherine and lt-m12 to m. incognita. the experiment was set up under semi-controlled conditions using potted plants of each genotype and the susceptible crop cucurbita sp. var. rg5, used as a control of the experiment. the plants were inoculated with 1,5 egg-juveniles per gram of soil with 10 replications per treatment. at sixty days after nematode inoculation, the gall index (gi), the reproduction factor and the reproduction index were determined to categorize the genotypes as resistant/susceptible. both genotypes showed a low root gall index (gi=2-3) in comparison with the control (gi=5) although they responded very susceptible to m. incognita as they allowed higher reproduction of the nematode in a 50% than the control. the results of this work confirmed that the gall index can not be used as a unique criterion to determine genotype resistance to m. incognita.
Efecto del Vermicompost y Quitina sobre el control de meloidogyne incognita en tomate a nivel de invernadero
Castro,Leida; Flores,Lorena; Uribe,Lidieth;
Agronomía Costarricense , 2011,
Abstract: meloidogyne incognita is a sedentary endoparasitic nematode, with total penetration and gall-forming; it has a wide geographical distribution and causes significant agricultural losses. recently, organic fertilizers and compounds such as chitin have been used in the suppression of plant pests and diseases. the aim of this study was to evaluate the effect of applying cattle manure vermicompost, and its enrichment with chitin, on the infection of m. incognita in tomato plants var. hayslip under greenhouse conditions. for this purpose, plants were inoculated with 5000 units of eggs+second stage juveniles per pot and were compared with controls grown in soil without organic amendment or chitin. the evaluation was carried out 60 days afterwards: the shoot and root fresh weight, shoot dry weight, total population in root and soil nematodes, root knot index (inr), rate of egg masses (imh), the nematode reproduction factor (fr) and functional-groups numbers (fungi, bacteria and actinomycetes) were measured. the addition of vermicompost to soil caused an increase in the variables of shoot fresh and dry weight and fresh root weight: the higher the percentage of vermicompost, the higher the increase; likewise, the application of vermicompost reduced the number of nematodes both in root and soil. the application of chitin accentuated these results by bringing about the lowest reproduction factor of m. incognita, with a value of 3.76 for the dose of vermicompost+50% chitin, whereas in the control this factor had a value of 93.20. the application of chitin as sole amendment affected only the soil fungi population, while the actinomycetes population nincreased in the amended treatments
Produtos naturais aplicados para manejo de Meloidogyne incognita em tomateiros Natural products applied to the management of Meloidogyne incognita in tomato plants
Thiago Anchieta de Melo,Ilka Márcia Ribeiro de Sousa Serra,Gilson Soares da Silva,Rosa Maria Souto de Sousa
Summa Phytopathologica , 2012, DOI: 10.1590/s0100-54052012000300007
Abstract: Este trabalho teve por objetivo avaliar o efeito de produtos naturais na express o da resistência a Meloidogyne incognita em plantas de tomate produzidos organicamente. Os indutores Rocksil, Quitosana, Neemseto e Biopirol foram aplicados 5, 10 e 15 dias, em tratamentos independentes, antes da inocula o do patógeno através da pulveriza o foliar, utilizando-se duas dosagens para cada indutor. A inocula o do nematoide foi realizada 30 dias após o plantio, usando-se 5000 ovos/ planta. Avaliando-se o número de ovos e o fator de reprodu o, 30 dias após a inocula o, observou-se que todos os tratamentos diferiram estatisticamente da testemunha, impedindo o aumento da popula o inicial do patógeno. Dentre os indutores, o indutor silicatado Rocksil foi o que apresentou os melhores resultados para o controle da meloidoginose em todas as épocas de aplica o e em todas as dosagens. Contudo, plantas tratadas com o produto apresentaram baixos pesos de parte aérea sugerindo que houve um custo adaptativo de resistência. Considerando-se o fator de reprodu o n o foram observadas diferen as estatísticas quando comparadas a dosagem e época de aplica o entre os indutores, com exce o da Quitosana aplicada aos 5 dias antes da inocula o e do Neemseto aplicado aos 15 dias antes da inocula o do nematóide. This study aimed to evaluate the effect of natural products on the expression of resistance to Meloidogyne incognita in organically produced tomato plants. The inducers Rocksil, Chitosan, Neemseto and Biopirol were applied at 5, 10 and 15 days as independent treatments before the pathogen inoculation by means of leaf spraying, using two levels for each inducer. The nematode inoculation was performed at 30 days after planting, using 5000 eggs/plant. Evaluating the number of eggs and the reproduction factor, at 30 days after inoculation, all treatments statistically differed from the control, preventing an increase in the initial population of the pathogen. Of the natural inducers, Rocksil showed the best results for controlling the root-knot nematode in all application times and at all levels. However, plants treated with the product had low shoot weights, suggesting that there was a fitness cost of resistance. Considering the reproduction factor, there were not statistical differences when the level and the application time were compared among natural inducers, except for Chitosan applied at 5 days before the nematode inoculation and Neemseto applied at 15 days before the nematode inoculation.
Studies on the interactive effect of Meloidogyne incognita and Fusarium solani on Lycopersicon esculentum, Mill
Mucksood Ahmad Ganaie,T.A. Khan
International Journal of Botany , 2011,
Abstract: A disease complex involving Meloidogyne incognita and Fusarium solani was studied on tomato (Lycopersicon esculentum, Mill.) under glasshouse conditions. Pot experiments were conducted to determine the pathogenesis of both the pathogens individually, simultaneously and sequentially. Isolates of M. incognita and F. solani singly caused a significant reduction in plant height, fresh weight, dry weight, number of fruits and fruit weight over the un-inoculated one but the reduction was more by M. incognita as compared to F. solani. A significant reduction in different plant growth parameters was observed on simultaneous and sequential inoculation of M. incognita and F. solani. However, the reduction was more prominent on simultaneous inoculation of both the pathogens. Among the sequential inoculations more damages were assessed during inoculation of M. incognita followed by F. solani (N+f10). Nematode multiplication, number of galls and number of females were adversely affected on simultaneous and sequential inoculation of both the pathogens in all the treatments. In the present study it was concluded that both the pathogens viz M. incognita and F. solani are virulent against the tomato c.v pusa ruby and therefore measures to prevent the spread of disease become important.
Fusarium oxysporum f. sp. phaseoli and Meloidogyne incognita interaction in common bean
Carneiro, Flávia Fernandes;Ramalho, Magno Antonio Patto;Pereira, M?nica Juliani Zavaglia;
Crop Breeding and Applied Biotechnology , 2010, DOI: 10.1590/S1984-70332010000300014
Abstract: to verify a possible relationship between resistance to nematodes and to fusarium oxysporum (fop) in common bean, 18 lines (eight resistant and eight susceptible to fop plus two controls) were evaluated for resistance to the nematode meloidogyne incognita. this evaluation was conducted in a greenhouse in a randomized block design with five replications. the plot consisted of one pot with two bean plants and a nematode-susceptible tomato plant. two weeks after sowing, plants were infested in the rhizosphere with 5000 eggs of meloidogyne incognita, race 3. the number of egg masses was assessed, about 45 days after inoculation. only lines esal 522, esal 519 and 'aporé' were resistant to the nematode. only 'aporé' was resistant to both pathogens. the correlation between grades of fop severity and mean egg mass was practically zero (r = 0.0252, p < 0.9293).
EFFECT OF ROOT EXUDATES OF TAGETES SP. ON EGG HATCHING BEHAVIOR OF MELOIDOGYNE INCOGNITA  [PDF]
Iruthaya Kalaiselvam,Aruna Devaraj
International Research Journal of Pharmacy , 2011,
Abstract: The effect root exudates of pre-planted marigold intercropped with tomato in regulating the hatching behavior of root-knot nematode - Meloidogyne incognita eggs were investigated. Marigold cultivars Tagetes patula, T. minuta, T. erecta, T. erecta (var. Orange), T. erecta (var. Yellow) significantly reduced the numbers of second-stage juveniles (J2s) in subsequent tomato compared to the tomato-tomato control. Four different concentrations (25, 50, 75 and 100 %) of water soluble extract from the selected varieties of Marigold cultivars were filtered and added to the petri dish and infested with the eggs of M. incognita. Data indicate that egg hatching was significantly affected by root exudates of Tagetes sp. however, nematicidal activity was species dependent. Root exudates of T. erecta were lethal to J2 of M. incognita and were inhibitory to the hatch of eggs at the concentration of 75 % or higher.
Inconsistency of the biological control of Meloidogyne incognita race 2 in melon by endophytic bacteria
Medeiros, Jeane E de;Mariano, Rosa de LR;Pedrosa, Elvira MR;Silveira, Elineide B da;
Horticultura Brasileira , 2009, DOI: 10.1590/S0102-05362009000300010
Abstract: we obtained 61 rhizobacterium isolates from rhizosphere soil samples collected in melon commercial fields located in mossoró, rio grande do norte state, brazil. these isolates, along with 56 endophytic bacteria from the collection of cultures of the plant bacteriology laboratory of the universidade federal rural de pernambuco, were tested for controlling meloidogyne incognita race 2 in melon. to infest the soil with nematodes, 1000 eggs of meloidogyne incognita race 2 per plant were placed in pots where seedlings of the yellow-type melon, cultivar af 682, were growing for 10 days. two days before, 20 ml of bacterial suspension (0.7 od570nm) were poured into each pot. after 60 days, fresh root biomass, gall index, egg mass, and the nematode reproduction factor were assessed. among the 117 isolates screened, the endophytic bacillus enm7, enm10, and enm51 were selected because they significantly reduced egg mass and/or gall index. however, when tested again, separately and in mixtures, these isolates nor confirmed their efficiency in vivo, neither affected juvenile emergence in vitro. these results give evidence on the inconsistency of using endophytic-bacteria in the control of m. incognita race 2 in melon.
Seed treatment affects Meloidogyne incognita penetration, colonization and reproduction on cotton
Bessi, Rosana;Sujimoto, Fernando Ribeiro;Inomoto, Mário Massayuki;
Ciência Rural , 2010, DOI: 10.1590/S0103-84782010000600030
Abstract: the effect of abamectin, applied as seed treatment, on meloidogyne incognita penetration, colonization, and reproduction on cotton was evaluated in two greenhouse experiments. second stage juveniles (j2) penetration was evaluated 3, 9 and 15 days after germination (dag), whereas the nematode colonization was evaluated 27dag, by counting the total number of galls and egg masses per root system. eggs and j2 were extracted from the roots to assess the nematode reproduction at 50 and 100dag. the seed treatment caused a decrease in j2 penetration in the roots, resulting in lower colonization and reproduction of m. incognita. these findings are discussed considering the environmental aspects of abamectin in the soil and the current practices for the crop management.
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