A 3-year study was carried out in north-east Italy, the site of recent elm yellows epidemics, to identify vectors for the elm yellows phytoplasma. Using PCR analysis, Ulmus minor and Ulmus pumila, each with and without symptoms, were positive for the elm yellows phytoplasma. Macropsis mendax, a...

Experimental transmission of European stone fruit yellows phytoplasma to Japanese plum cv. Ozark Premier was achieved using Cacopsylla pruni, caught in the field or raised on infected plants under controlled conditions. Using different groups of infectious psyllas, 89% of the inoculated test plants ...

In the Friuli-Venezia Giulia region of Italy the cultivars Florina, Prima and Priscilla, which are resistant to scab (Venturia inaequalis), were planted during 1985-90 in numerous orchards cultivated according to organic farming regimes with no insecticides used. Observations in 2 orchards during a ...

In a 6-year transmission trial using S. titanus, the results were negative when the source of inoculum was symptomatic plants from vineyards of the Friuli-Venezia Giulia region, Italy. Transmissions were positive when the insects were fed on Perera symptomatic grapes of the Valdobbiadene area,...