175 research outputs found
Field observations about the behaviour of codling-moth in Trentino (North-Eastern Italy)
Codling-moth and applescab are the most important pathogens in both conventional and
organic apple productions. In order to control any phytopathological problem, it is
important to improve the knowledge of the behaviour of each specific pest. Since several
years (starting from 1986) we are improving in Trentino (North-Eastern Italy) the
observations of the population dynamics of codling-moth in order to find the best way to
control and treat this pest insect.
Constant monitoring and the knowledge of the characteristics of the different compounds
and possible methods to control the codling-moth (mating disruption, granulose virus and
specific nematodes) represent the most important basis to organize an effective controlstrategy
Detection and distribution of European stone fruit yellows (ESFY) in apricot cv. âBergeronâ and epidemiological studies in the province of Trento (Italy)
The aim was to investigate the performance of âBergeronâ on âWavitâ in 4 experimental fields, in the province of Trento (Italy), where European stone fruit yellows (ESFY) caused by âCandidatus Phytoplasma prunorumâ has been constantly spreading since 2000.This included visual inspections for typical symptoms (early bud-break during dormancy and premature leaf-roll) and a highly sensitive Real time-PCR (Rt-PCR) assay. 25 % of the propagation material was checked with this method and found to be healthy, before planting in 2005.The epidemiology of the disease was also studied by focusing on: the presence of the vector Cacopsylla pruni (Scopoli) on conifers, the detection of âCa. P. prunorumâ in psyllid eggs and the transmission efficiency at different stages. This was done by exposing apricot trees in 2 locations, during 2 periods from January to July, to the overlapping presence in the orchards of the re-immigrants and the new generation of C. pruni. The results obtained demonstrated that âBergeronâ seems to be highly susceptible to ESFY: typical bud-break was rarely observed, but up to 20-30% of the plants showed premature leaf-roll, fruit deformation and dieback. C. pruni was caught only once on Picea abies during winter; âCa. P. prunorumâ was found in 4 egg samples from 2 locations and the preliminary results on the exposed trees confirmed that the re-immigrants could be the most efficient vectors at least on apricot.Keywords: Prunus armeniaca, cultivar âBergeronâ, Real time-PCR, âCandidatus Phytoplasma prunorumâ,epidemiolog
Accounting for risk of non linear portfolios: a novel Fourier approach
The presence of non linear instruments is responsible for the emergence of
non Gaussian features in the price changes distribution of realistic
portfolios, even for Normally distributed risk factors. This is especially true
for the benchmark Delta Gamma Normal model, which in general exhibits
exponentially damped power law tails. We show how the knowledge of the model
characteristic function leads to Fourier representations for two standard risk
measures, the Value at Risk and the Expected Shortfall, and for their
sensitivities with respect to the model parameters. We detail the numerical
implementation of our formulae and we emphasizes the reliability and efficiency
of our results in comparison with Monte Carlo simulation.Comment: 10 pages, 12 figures. Final version accepted for publication on Eur.
Phys. J.
Estimativa do custo do tratamento do cĂąncer de pele tipo nĂŁo-melanoma no Estado de SĂŁo Paulo - Brasil
Estimating the opportunity costs of environmental conservation in the FeijĂŁo River watershed (SĂŁo Carlos-SP, Brazil)
THERMODYNAMIC PROPERTIES OF NONAQUEOUS SINGLE SALT SOLUTIONS USING THE Q-ELECTROLATTICE EQUATION OF STATE
Estimativa do custo do tratamento de cĂąncer de pele tipo melanoma no Estado de SĂŁo Paulo - Brasil
DivisĂŁo do trabalho social e arranjos produtivos locais: reflexos econĂŽmicos de efeitos morais de redes interorganizacionais
Anålise de trilha de componentes de produção primårios e secundårios em tomateiro do grupo Salada
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