Occurrence of black aspergilli and ochratoxin A on grapes in Italy.

Ochratoxin A (OTA) in wine is linked to contamination by several Aspergillus species. In 2003-2007, grape samples collected in Italy were surveyed for the presence of OTA and OTA-producing fungi. A.

Inhibition of Sporulation and Ultrastructural Alterations of Grapevine Downy Mildew by the Endophytic Fungus Alternaria alternata.

ABSTRACT One hundred twenty-six endophytic microorganisms isolated from grapevine leaves showing anomalous symptoms of downy mildew were tested on grapevine leaf disks as biocontrol agents against Plasmopara viticola. Among the 126 microorganisms, only five fungal isolates completely inhibited the sporulation of P. viticola; all of them were identified as Alternaria alternata.

Ultrastructural analysis of Vitis vinifera leaf tissues showing atypical symptoms of Plasmopara viticola.

In an abandoned farm in Tuscany a year by year regression of downy mildew disease on grapevines was observed and a decrease in virulence as well as vigor and fertility of the causal fungus, Plasmopara viticola. Anomalous spots of the fungus (i.e.