1,720,969 research outputs found
Le malattie del grano nell'Italia settentrionale
No full textLe coltivazioni di grano del nord dell’Italia sono soggette ad attacchi di
vari funghi patogeni; la diffusione
e l’incidenza di queste malattie varia però da un areale all’altro, di stagione in stagione - in rapporto all’andamento meteorologico stagionale
– e da coltura a coltura – in relazione alle scelte colturali e alla gestione agronomica.
In questo contributo si è voluto delineare l’evoluzione delle principali malattie (oidio, ruggine bruna, septoriosi e fusariosi della spiga) dal 2006 al 2013
Influenza di strategie anti-resistenza sulla sensibilità ai fungicidi in Cercospora beticola
No full textIn the years 2003 and 2004, the effect of different SBI and QoI fungicides, used alone, in mixture or in alternation, on the sensibility level of Cercospora beticola populations was studied. Sensibility was studied in laboratory using fungal isoltes collected in the experimental fields before the beginning of fungicide sprays and after three fungicide applications. A decrease of fungal populations’ sensibility was registered for tetraconazole, when it was used alone or in mixture with azoxystrobin at reduced rates. On the contrary, the use of tetraconazole and azoxystrobin at full rates, as well as the use of difenoconazole and fenpropidin, significantly reduced the proportion of isolates showing reduced sensibility to tetraconazole. No reduced sensibility was observed for azoxystrobin. Some isolates were less sensitive to difenoconazole in one experimental site that had been shown reduced sensibility to IBS fungicides
Concentration dynamics of SBI and QoI fungicides in sugar beet leaves
No full textA three-year trial was carried out in order to study the long-term dynamics of foliar concentration of two fungicides belonging to the SBI (Sterol Biosysnthesis Inhibitor) and QoI (Quinone outside Inhibitor) groups, the most important active substances used in controlling Cercospora leaf spot. Fungicides were applied following the usual schedule, with three sprays per season at 20-day intervals. Foliar concentrations of both fungicides were tested after 1, 3, 9 and 18 days after application. Results showed that the foliar concentration of these substances changes according to fungicide characteristics, application time, time elapsed after distribution, and size of sugar beet canopy. These results suggest new approaches for applying fungicides to control Cercospora leaf spot epidemics
Sensibilità verso fungicidi IBS in popolazioni di Cercospora beticola raccolte in Val Padana
No full textIn the period 1998-2001, a study was carried out in several sugar beet fields of northern Italy to determine the distribution of sensitivity to SBIs fungicides within populations of Cercospora beticola from the Po Valley. The study showed a decrease in the sensitivity level of some fungal strains grown on fungicide amended medium. In spite of the high number of tested fungal strains (1550), it was not possible to draw final conclusions about the real magnitude of this phenomenon; however, the progress of the situation has to be studied further and, in the meantime, the anti-resistance strategies must not be neglected
Cognitive assessment of executive functions using brain computer interface and eye-tracking
Get PDFNew technologies to enable augmentative and alternative communication in Amyotrophic Lateral Sclerosis (ALS) have been recently used in several studies. However, a comprehensive battery for cognitive assessment has not been implemented yet. Brain computer interfaces are innovative systems able to generate a control signal from brain responses conveying messages directly to a computer. Another available technology for communication purposes is the Eye-tracker system, that conveys messages from eye-movement to a computer. In this study we explored the use of these two technologies for the cognitive assessment of executive functions in a healthy population and in a ALS patient, also verifying usability, pleasantness, fatigue, and emotional aspects related to the setting. Our preliminary results may have interesting implications for both clinical practice (the availability of an effective tool for neuropsychological evaluation of ALS patients) and ethical issues
Dynamics of fungi and related mycotoxins during cereal storage in silo bags
No full textThe aim of this work was to investigate the dynamics of fungi and related mycotoxins during cereal storage in silo bags. A 2-year trial was organised (2009-2011); in each year, two silo bags, filled with maize and durum wheat respectively, were prepared . During storage, meteorological data were collected from a close station and temperature, CO2 and O2 were measured inside the silos. Grain was sampled from silo filling (September) every 40 days until June (7/8 samples per silo per year). Water activity of grain, colony forming units (CFU) and mycotoxin content (fumonisins, aflatoxins and ochratoxin in maize, deoxynivalenol and ochratoxin in wheat) were determined.
Temperature inside the silo bags followed the trend of external temperature, with a more limited variation. A decrease of O2 was observed from 16.4% to 2.0% in maize and from 15.7% to 15.1% in wheat; the decrease was balanced by CO2 increase. Minor variations were registered in grain water activity and CFU and mycotoxin content did not change significant throughout the storage period; the results were consistent in the two years. On the basis of these results, silo bags prove to be suitable for safe cereal storage
Development of an Automatic Prototype to Measure Soil GHG Emissions within the Project LIFE AGRESTIC
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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