Population dynamics of the root lesion nematode, Pratylenchus brachyurus, in soybean fields in Tocantins state and its effect to soybean yield.

Pratylenchus brachyurus has become increasingly common in soybean fields throughout Brazil where yield loss assessments have reported reduction up to 30%. Currently, no soybean cultivars resistant to P. brachyurus have been identified, and management strategies include crop rotation with non-host crops, fallow, and the application of nematicides. The goals of this study were to examine the population dynamics of P. brachyurus in soybean fields throughout Tocantins state and in areas planted with off-season crops following soybean harvest in a crop succession scheme. Pratylenchus brachyurus was present in ca. 82% of samples with densities in soybean fields ranging from 23 to 20,400 nematodes per 200 cm3 soil or 10 g root samples. In two sites, the mean nematode density was higher within infestation foci, which were characterized by poor soybean growth, compared to those from outside infestation foci, with an overall reduction of 44.3% in plant height and 39.7% in pod numbers. Following soybean harvest in areas planted with off-season crops including maize, sorghum, millet, crotalaria as well as an area maintained as a fallow treatment, the mean density of P. brachyurus ranged from 122 to 504 individuals per 10 g root sample and from 3 to 96 per 200 cm3 soil. Overall, the mean density of nematodes did not differ significantly among plant species and all crops used in the succession scheme allowed P. brachyurus multiplication. In summary, off-season cultivation with the crops used in this study is not recommended for management of P. brachyurus in soybean, but the use of fallow or non-hosts may be helpful in lowering the population density of P. brachyurus in soybean fields

Desempenho agronômico de cultivares de batata-doce em Palmas, TO.

O presente trabalho teve como objetivo avaliar o desempenho agronômico de oito cultivares utilizando mudas que passaram pela limpeza clonal.Suplemento. Edição dos Anais do 53 Congresso Brasileiro de Olericultura

Reação de genótipos de abóbora a Phytophthora capsici.

O objetivo deste trabalho foi avaliar a reação de 30 genótipos de abóbora (acessos, linhagens e cultivares comerciais) a Phytophthora capsici Leonian. Como testemunhas utilizou-se pimentão ?Casca Dura Ikeda?.Resumo 19

Ocorrência da ferrugem polissora do milho (Puccinia polysora) no Estado da Bahia.

Suplemento. Edição dos resumos do 23º Congresso Paulista de Fitopatologia e 6º Reunião de Controle Biológico de Doenças de Plantas, Campinas

Reação de acessos silvestres de Solanum atramonifolium A. Fusarium oxysporum f. sp. lycopersici Raça 3.

O objetivo deste trabalho foi avaliar a reação de 25 acessos silvestres de Solanum stramonifolium (jurubeba Juna), 3 de Solanum melongena e híbridos interespecíficos de Solanum aethiopicum × S. melongena, S. aethiopicum × S. licocarpum e S. scuticum × S. torvum para resistência a Fusarium oxysporum f. sp. lycopersici raça 3.Resumo 18

Eficiência de controle de Brachiaria ruziziensis com glyphosate em função de adjuvante e dose.

bitstream/item/111652/1/38-eficiencia-felipe.pd

Landscape elements, water resources and ecosystem services: their relations to losses and gains in a Pantanal region.

In the last decades, the region of Bonito (Mato Grosso do Sul State - MS) has presented an increase in urban areas, causing impacts on water resources, landscape fragmentation and loss of ecosystem services (ES). Aiming to study the relation chain among land use, water resources and ES, this work determined the influence of the composition from ladscape elements and water quality on the offer of three ES (water quality, erosion control and tourism), also defining the critical points between offer of water services and loss of natural resources for urbanization. For this purpose, the following tasks were accomplished: (i) statistical analysis of Pearson correlation and Principal Components Analysis (PCA) to determine the relations between water quality and mapping classes; (ii) elaboration of equations to determine the ES and (iii) analysis of the relation the quality of ESs and the quantity of urbanized areas in several segments of the Formoso river basin (MS). The results showed that at the sub-basin of Bonito stream, the services presented a degradation of around 80% in relation to the Formoso river basin. Besides that, it was verified that one fourth of the urbanized territory caused around 30% of service losses of water quality.Número especial