A new method to unveil blazars among multi-wavelength counterparts of Unassociated Fermi gamma-ray Sources

We discuss a new method for unveiling the possible blazar AGN nature among the numerous population of Unassociated Gamma-ray sources (UGS) in the Fermi catalogues. Our tool relies on positional correspondence of the Fermi object with X-ray sources (mostly from Swift-XRT), correlated with other radio, IR and optical data in the field. We built a set of Spectral Energy Distributions (SED) templates representative of the various blazar classes, and we quantitatively compared them to the observed multi-wavelength flux density data for all Swift-XRT sources found within the Fermi error-box, by taking advantage of some well-recognised regularities in the broad-band spectral properties of the objects. We tested the procedure by comparison with a few well-known blazars, and tested the chance for false positive recognition of UGS sources against known pulsars and other Galactic and extragalactic sources. Based on our spectral recognition tool, we find the blazar candidate counterparts for 14 2FGL UGSs among 183 selected at high galactic latitudes. Further our tool also allows us rough estimates of the redshift for the candidate blazar. In a few cases in which this has been possible (i.e. when the counterpart was a SDSS object), we verified that our estimate is consistent with the measured redshift. The estimated redshifts of the proposed UGS counterparts are larger, on average, than those of known Fermi blazars, a fact that might explain the lack of previous association or identification in published catalogues.Comment: 41 pages, 40 figures, 3 tables, accepted for publication in MNRA

Prove di lotta contro il <i>Cladosporium cucumerinum</i> Ell. <i>et</i> Arth. agente della «cladosporiosi» dello zucchino

The results of control trials against Cladosporium cucumerinum Ell. et Arth. artificially inoculated on aged pumpkin plants and in soil belore seeding, are referred. All the tested fungicides (benomyl, captafol, chlorothalonil, iprodione, mancozeb, procymidone, thiram, thyophanate-methyl), although with dlfference according to the kind of treatment, limited infections powerfully. Thyophanate-methyl and benomyl in foliar sprays, thyophanate-methyl and chlorothalonil in soil drench, thyophanate-methyl, benomyl and captafol in seed dressing, gave best results. By these results, tha Authors point out that a very good control of pumpkin scab is attainable avoiding primary infections on seedlings by soil drench and se ed dressing

La «Cladosporiosi» dello zucchino (<i>Cucurbita pepo</i> L.) in coltura protetta in Sardegna

On last years the «scab» of pumpkin (Cucurbita pepo L.) induced by Cladosporium cucumerinum Ell. et Arth. has been observed very damaging on greenhouse cultures in southern Sardinia (Italy). The disease symptoms and epidemiology, as well as the pathogen's characters, are described. Finally, control means are briefly reviewed

Il «Marciume molle» dei frutti di pomodoro da <i>Pseudomonas virdiflava</i> (Burkholder) Dowson

The Authors report on the results of researches about a serious soft rot of greenhouse tomato fruits in southern Sardinia (Italy). The disease symptoms and the characteristics of the causal agent, identified by its morphological and cultural characters, and by biochemical and serological lests, as Pseudomonas viridiflava (Burkholder) Dowson, are described

L'«Alternariosi» del cartamo (<i>Carthamus tinctorius</i> L.) da <i>Alternaria cartami</i> Ch. in Sardegna

A stem and leaf spot of safflower by Alternaria carthami Ch. has been found on last three years in Sardinia (Italy). The disease symptoms and the pathogen characters are described. The susceptibility of 7 safflower expe rimental cvs. has been assessed, and by artificial inoculations the fungus pathogenicity was checked. Finally, the Authors examine some epidemiological aspects of the disese and briefly expose the control means

L' «Avvizzimento» del pomodoro (<i>Lycopersicum esculentum</i> Mill.) causato da <i>Alternaria alternata</i> f. sp. <i>Lycopersici</i> Grogan, Kimble e Misaghi

A serious disease of tomato cultivar « Early pak 7 » for fresh-market production found in several greenhouses in southern Sardinia (ltaly) is described. Plants are affected in all stages of development with local lesions at the foot, and with typical symptoms of a vascular disease. The causal agent has been identified as Alternaria alternata f. sp. lycopersici Grogan, Kimble and Mis. Morphological and physiologlcal characters of the fungus grown in pure culture are described, and also data on pathogeniclty and host-specificity are reported. Laboratory cultural and crossinfection tests showed that this fungus strongly resembles to A. alternata f. sp.lycopersici isolated in California (USA) as « tomato stem canker » agent

Ulteriori esperienze di lotta contro il «marciume dei capolini» del carciofo da <i>Botrytis cinerea</i> Pers.

During the winter of 1982 field control trials were carried out against head rot of globe artichoke (Cynara scolymus L.) induced by Botrytis cinerea Pers. Treatments bega n when first symptoms appeared and were repeated every 10 days. for 4 times in alI. Among tested compounds the best results were given by dicarboximide derivatives (vinchlozolin, procymidox, iprodione, dichlozolinate) and by prochloraz while less satisfactory appeared dichlofluanid and a mixture of captafol + folpet. No adverse side effect on treated plants was observed with any fungicide

Osservazioni sulla patogenesi e sulla epidemiologia dell'«avvizzimento» del pomodoro (<i>Lycopersicum esculentum</i> mill.) da <i> Alternaria alternata</i> f. sp. <i>Lycopersici</i> grogan, kimble e misaghi

Alternaria alternata f. sp. Lycopersici Grogan, Kimble and Misaghi is the causal agent of a serious wilt of greenhouse «Earlypak» tomato in Sardinia (Italy). In phytopathological tests this cv. displayed a very high susceptibility both to direct infection and to metabolites effect of the fungus; instead some newly introduced tomato hybrids proved, some more some less, all resistent. The possible infection sources have been found, and so the ways of disease spreading were examined. Finally, some measures in order to prevent the disease are suggested

Phytotoxic metabolites produced by fungi involvedin cork oak decline

Diplodia corticola, anamorph of Botryosphaeria corticola Phillips, Alves et Luque, and Biscognauxia mediterranea (De Not.) O. Kuntze (= Hypoxylon mediterraneum) have often been associated with serious decline phenomena, which have been affecting the cork oak forest in Italy and other Mediterranean countries for several years. Diplodia corticola is widespread in Sardinian oak forests, and can affect plants of different ages, inducing symptoms which include dieback, cankers and vascular necrosis. These studies may provide information which could be useful for understanding the chemistry and the biology governing the relationship between these fungi and their hosts. Further studies should aim to also evaluate the ecological role of these substances