Protocolo usado na Embrapa Trigo para caracterizar o Tipo I e Tipo II de resistência genética à giberela em trigo.

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Giberela ou brusone? Orientações para a identificação correta dessas enfermidades em trigo e em cevada.

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Protocolo usado na Embrapa Trigo para produção de peritécios de Gibberella zeae em grãos de trigo.

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Caracterização preliminar de genótipos de cevada quanto à reação à brusone nas folhas.

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Epidemiologia das doenças das plantas úteis nos diferentes sistemas de plantio.

São discutidos a ocorrência de Microcyclus ulei e Thanatephorus cucumeris em seringueira; Phytophthora sp., Septobasidium pseudopediculatum e S. sacardinum em laranja; Crinipellis perniciosa em cupuaçu; Meloidogyne sp. em mamão; e de Xanthomonas campestris pv. manihotis em mandioca.bitstream/item/180863/1/Recuperacao-88-95.pd

Incidence of foliar diseases in mixed cultivation systems.

Incidência de doenças foliares em sistemas de policultivo: Mixed cropping systems can be an alternative to traditional cultivation methods in humid tropical areas such as Amazonia. The dispersion of species in the cultivated area will probably reduce the incidence of disease, because the non-host plants serve as a barrier to the spread of pathogens. Recultivation of abandoned area with the aid of mixed cropping systems has been studied. Since July 1993, the severity of infection of rubber trees has been assessed weekly and the incidence of disease in the other crops monitored monthly. Only rubber, orange, cassava and papaya have been affected. As the plants have not yet reached asufficient height to form pathogen barriers, the differences between the monocultures and the mixed cultivation systems are not significant.The occurrence of Microcyclus ulei and Thanatephorus cucumeris in rubber, Phytophthora citrophthora, Septobasidium pseudopediculatum and S. sacardium in orange. Meloidogyne sp. in papaya and Xanthomonas campestris p.v. manihotis in cassava are discussed

Clustering, Angular Size and Dark Energy

The influence of dark matter inhomogeneities on the angular size-redshift test is investigated for a large class of flat cosmological models driven by dark energy plus a cold dark matter component (XCDM model). The results are presented in two steps. First, the mass inhomogeneities are modeled by a generalized Zeldovich-Kantowski-Dyer-Roeder (ZKDR) distance which is characterized by a smoothness parameter $\alpha(z)$ and a power index $\gamma$, and, second, we provide a statistical analysis to angular size data for a large sample of milliarcsecond compact radio sources. As a general result, we have found that the $\alpha$ parameter is totally unconstrained by this sample of angular diameter data.Comment: 9 pages, 7 figures, accepted in Physical Review

Numerical modeling of surface runoff and erosion due to moving rainstorms at the drainage basin scale

A physically-based distributed erosion model (MEFIDIS) was applied to evaluate the consequences of storm movement on runoff and erosion from the Alenquer basin in Portugal. Controlled soil flume laboratory experiments were also used to test the model. Nine synthetic circular storms were used, combining three storm diameters (0.5, 1 and 2 times the Alenquer basin's axial length) with three speeds of storm movement (0.5, 1 and 2 m/s); storm intensities were synthesized in order to maintain a constant rainfall depth of 50 mm. The model was applied to storms moving downstream as well as upstream along the basin's axis. In all tests, downstream-moving storms caused significantly higher peak runoff (56.5%) and net erosion (9.1%) than did upstream-moving storms. The consequences for peak runoff were amplified as the storm intensity increased. The hydrograph shapes were also different: for downstream-moving storms, runoff started later and the rising limb was steeper, whereas for upstream moving storms, runoff started early and the rising limb was less steep. Both laboratory and model simulations on the Alenquer basin showed that the direction of storm movement, especially in case of extreme rainfall events, significantly affected runoff and soil loss.http://www.sciencedirect.com/science/article/B6V6C-4K7WTYF-3/1/05f00859098982a6ae43cfee9cc48fe