Densidade populacional de pratylenchus spp. em pastagens de brachiaria spp. e sua influĂȘncia na disponibilidade e na qualidade da forragem

Carregando...
Imagem de Miniatura

Data

2013-04-10

Autores

de Carvalho, Cassia
Fernandes, Celso Dornelas
dos Santos, Jaime Maia [UNESP]
Macedo, Manuel Claudio Motta

TĂ­tulo da Revista

ISSN da Revista

TĂ­tulo de Volume

Editor

Resumo

The aim of this work was to evaluate the population density of Pratylenchus brachyurus and Pratylenchus zeae associated with Brachiaria brizantha, B. decumbens and B. humidicola and their influence on forage availability and quality. The experiment was conducte in the Hisaeda Farm, Terenos, MS, Brazil. Soil, roots and plant aerial part were harvest with ten replications each, in one square meter randomized sets encompassing three treatments: Good, Intermediary and Bad, visually characterized, considering the percentage of green material. P. brachyurus and P. zeae density were evaluated in soil and plant roots. Dry matter of green, dead and re-growth materials, plant nutritional status and forage quality were assessed in the aerial plant part. Soil fertility was determined in all harvested samples. Both nematode species were identified from all samples, with a larger numbe in the roots (between 87-311 P. brachyurus and 1-61 P. zeae.10 g-1) than in the soil (0-8 P. brachyurus and 1-39 P. zeae.200 cm-3), however, no significant differences were found in the number of specimens between treatments. Considering that these forage species are perennial and host Pratylenchus spp, there is a tendency to increase the population of these pathogens over time, becoming a serious phytosanitary problem.

Descrição

Palavras-chave

B. decumbens, B. humidicola, Brachiaria brizantha, P. zeae, Poaceae, Pratylenchus brachyurus

Como citar

Revista Ceres, v. 60, n. 1, p. 30-37, 2013.