Influenza del Potyvirus latente del carciofo «Spinoso sardo» sulla produitività delle piante in pieno campo: 2. risultati relativi al secondo anno di impianto

In order to evaluate the influence of the artichoke latent Potyvirus (ALV) on plant productivity, a comparative field trial between virus-freed by meristem-tip culture and naturally Infected «Spinoso sardo» plants has been repeated for the second year in Sardinia. On the whole the results corroborate those of the first year: the latent infection doesn't affect the earliness and the number of heads per plant; whereas it negatively influences the weight, the diamater and the stem length of the heads

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

Reperimento del virus dell'«arricciamento maculato» il del carciofo (AMCV) in Sardegna

A virus disease of «Masedu» of artichoke has been observed, in a serious form, in southern Sardinia (Italy). Affected plants are stunted with leaves heavily mottled, crinkled and laciniated. On the basis of the herbaceous hosts reactions, physical properties «in vitro», spectrophotometry, electron microscopy and serology, the virus recovered from diseased plants is identified as an isolate of AMCV, belonging to «Tombusvirus» group, serologically undistinguishable from the italian type isolate

Il Risanamento degli agrumi dal viroide dell'Exocortite mediante il microinnesto

Nearly all old line citrus trees growing in Sardinia (Italy) are infected by citrus exocortis viroid (CEV). The technique of shoot-tip grafting has proved effective in recovering various citrus cultivars free of this viroid

La «maculatura batterica» del pomodoro (<i>Lycopersicum esculentum</i> Mill.) causata da <i>Pseudomonas syringae</i> van Hall.

The Authors report on a serious bacterial spot of greenhouse tomato found in Sardinia (Italy) on last years. The symptomatology, epidemlology and inducing factors are described, as well as the results of pathogenicity test. The causal agent has been isolated in pure culture and identified by means of morfological, cultural, biochemical, and serological characters as Pseudomonas syringae van Hall. Furthermore, methods of dlsease preventlon and control are brlefly exposed

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

Osservazioni sul «marciume dei capolini» del carciofo (<i>Cynara scolymus</i> L.) da <i>Botrytis cinerea</i> Pers. in Sardegna

The «head rot» of globe artichoke (Cynara scolymus L.) induced by Botrytis cinerea Pers., which occurs more and more damaging in sardinian crops, 15 described. The inciting factors (of agronomic, climatic, and biotic nature) are reviewed, and the risks of heavy losses for the collected and packed artichokes are pointed out. Suitable means for preventing and controlling the disease are then suggested

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

<i>Fusarium roseum</i> var. <i>avenaceum</i> (Sacc.) Snyd. et Hans. agente di un « marciume molle» dei frutti di pomodoro in coltura protetta

The Authors report on the results of researches about a serious soft rot of greenhouse tomato fruits recently found in Sardinia (Italy). The disease symptoms and the characters of its causal agent, identified as Fusarium roseum var. avenaceum (Sacc.) Snyd. et Hans., are described. In laboratory, the influence of temperature, pH, and several culture media on growth and sporulation of the fungus, has been investigated. Artificial infection tests on tomato showed the high pathogenicity of the fungus to fruits only, but not to other plant organs

Determinazione dei residui di Deltametrina nelle ciliegie

This paper describes the determination of residues of the insecticide Deltamethrin in cherries growing in the Bonnanaro area near Sassari (Sardinia - Italy). The analytical procedure for the isolation of the insecticide was developed. The quantitative determinations were carried out by HPLC, with UV detector at 220 nm, on a Perkin-Elmer C18-HS3 column with acetonitrile - water (75: 25) as the mobile phase. A rapid decrease of the concentration of the insecticide with ti me was ascertained; three days after from the treatment the values were significantly lower than those required by the italian law