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- Title
DINÂMICA POPULACIONAL DE FITONEMATOIDES SOB REGIMES DE FLUXO DE ÁGUA EM COLUNAS DE SOLO.
- Authors
de Barros, Patrícia Ângelo; Régis Pedrosa, Elvira Maria; de França e Silva, Ênio Farias; de Miranda, Jarbas Honório; Monteiro Rolim, Mario; de Lima David, Mariana Ferreira
- Abstract
Plant-parasitic nematodes cause serious agricultural losses worldwide. Although the damage and the population densities of these parasites are higher in sandy soils, there is little information on how the texture and soil hydrodynamics affect the movement of the nematode. Whereas the movement of plant-parasitic nematodes in soil is affected by the environment, soil texture is highly relevant to the nematode mobility and efficiency in infection. Therefore, this study aimed to evaluate the influence of water flux density on plant-parasitic nematode mobility. Evaluations were performed in the Laboratory of Nematology of the Federal Rural University of Pernambuco (UFRPE) and in the Soil Physics Laboratory and Water Quality, Department of Biosystems Engineering, Escola Superior de Agricultura Luiz de Queiroz (ESALQ/USP), using soil columns (11.0 cm long acrylic cylinder with 1.95 cm internal diameter and 3.0 cm2 cross section) with a peristaltic pump, under saturation and stationary flow regime. The experimental design was completely randomized in a factorial 3 (species of nematode: Meloidogyne enterolobii, M. incognita, Pratylenchus coffeae) × 2 (nematode condition: alive, dead) × 3 (soil types: Latossol, Nitosol, and washed sand) × 3 (soil density: bulk density, density 0.1 g cm3 above and below the true density of each soil) × 4 (flow rate: 5, 15, 25 and 40 ml min-1) crossed and nested arrangement with three replications. The increase in flow rate from 5 to 40 ml min-1 increased the amount of leached nematodes, although fewer M. incognita juveniles were leached than P. coffeae. Nematode mobility increased as the sand level increased or the soil density decreased. In contrast, in clay soils with density ranging from 1.1 to 1.3 (g cm-3) the dynamics of nematodes was almost nil.
- Subjects
NEMATODE populations; SANDY soils; NEMATODE diseases of plants; SOIL density; SOIL nematodes
- Publication
Nematropica, 2016, Vol 46, Issue 2, p244
- ISSN
0099-5444
- Publication type
Article