Estudo de tres populaçoes de nematoides nocivos ao cafeeiro
The effect of three populations of the genus Meloidogyne, obtained from Coffea arabica, upon seedlings of the same species of coffee was studied. Three distinct soil types, representing the soil where the populations were collected, were used as planting substrates. The three soil types were collected from the rhizosphere of highly infested coffee trees in Lucélia, Ribeirao Preto and Campinas, SP. A portion of soil from each location was fumigated with methyl bromide, so that the soil could be reinfested with populations from the other two locations. The remaining part of each soil was not treated with methyl bromide. The original nematode population in each soil served as a control upon the influence of the soil upon the pathogenicity of the Meloidogyne spp. Fifteen nematode population/soil type treatments were studied. The seedlings were allowed to grow for 8.5 months. Many plants died when inoculated with the population from Lucélia. Table I contains the results from plant weights and measurements; root-knot index evaluated on a scale of 1 to 5; and the identification of the nematodes found in roots. Table 2 lists the relation of plant heights to the degree of nematode infestation. The populations from Ribeirao Preto and Campinas were identified as M. exigua. The population from Lucélia, which was inicially considered as a more pathogenic selection of M. exigua, was later identified as M. incognita. It was shown to be more damaging to coffee trees than M. exigua. Soil type influenced the pathogenicity
| Main Authors: | , , , |
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| Format: | biblioteca |
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Piracicaba, SP (Brasil)
1977
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| Subjects: | COFFEA ARABICA, PLANTULAS, NEMATODOS DE LAS PLANTAS, MELOIDOGYNE INCOGNITA, MELOIDOGYNE EXIGUA, INFESTACION, MUNDO NOVO, BRASIL, |
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| Summary: | The effect of three populations of the genus Meloidogyne, obtained from Coffea arabica, upon seedlings of the same species of coffee was studied. Three distinct soil types, representing the soil where the populations were collected, were used as planting substrates. The three soil types were collected from the rhizosphere of highly infested coffee trees in Lucélia, Ribeirao Preto and Campinas, SP. A portion of soil from each location was fumigated with methyl bromide, so that the soil could be reinfested with populations from the other two locations. The remaining part of each soil was not treated with methyl bromide. The original nematode population in each soil served as a control upon the influence of the soil upon the pathogenicity of the Meloidogyne spp. Fifteen nematode population/soil type treatments were studied. The seedlings were allowed to grow for 8.5 months. Many plants died when inoculated with the population from Lucélia. Table I contains the results from plant weights and measurements; root-knot index evaluated on a scale of 1 to 5; and the identification of the nematodes found in roots. Table 2 lists the relation of plant heights to the degree of nematode infestation. The populations from Ribeirao Preto and Campinas were identified as M. exigua. The population from Lucélia, which was inicially considered as a more pathogenic selection of M. exigua, was later identified as M. incognita. It was shown to be more damaging to coffee trees than M. exigua. Soil type influenced the pathogenicity |
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